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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull perf updates from Ingo Molnar:
 "Mostly tooling and PMU driver fixes, but also a number of late updates
  such as the reworking of the call-chain size limiting logic to make
  call-graph recording more robust, plus tooling side changes for the
  new 'backwards ring-buffer' extension to the perf ring-buffer"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (34 commits)
  perf record: Read from backward ring buffer
  perf record: Rename variable to make code clear
  perf record: Prevent reading invalid data in record__mmap_read
  perf evlist: Add API to pause/resume
  perf trace: Use the ptr->name beautifier as default for "filename" args
  perf trace: Use the fd->name beautifier as default for "fd" args
  perf report: Add srcline_from/to branch sort keys
  perf evsel: Record fd into perf_mmap
  perf evsel: Add overwrite attribute and check write_backward
  perf tools: Set buildid dir under symfs when --symfs is provided
  perf trace: Only auto set call-graph to "dwarf" when syscalls are being traced
  perf annotate: Sort list of recognised instructions
  perf annotate: Fix identification of ARM blt and bls instructions
  perf tools: Fix usage of max_stack sysctl
  perf callchain: Stop validating callchains by the max_stack sysctl
  perf trace: Fix exit_group() formatting
  perf top: Use machine->kptr_restrict_warned
  perf trace: Warn when trying to resolve kernel addresses with kptr_restrict=1
  perf machine: Do not bail out if not managing to read ref reloc symbol
  perf/x86/intel/p4: Trival indentation fix, remove space
  ...
This commit is contained in:
Linus Torvalds 2016-05-25 17:05:40 -07:00
commit bdc6b758e4
56 changed files with 619 additions and 331 deletions
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14
Documentation/sysctl/kernel.txt
View File

@ -61,6 +61,7 @@ show up in /proc/sys/kernel:
- perf_cpu_time_max_percent
- perf_event_paranoid
- perf_event_max_stack
- perf_event_max_contexts_per_stack
- pid_max
- powersave-nap [ PPC only ]
- printk
@ -668,6 +669,19 @@ The default value is 127.
==============================================================
perf_event_max_contexts_per_stack:
Controls maximum number of stack frame context entries for
(attr.sample_type & PERF_SAMPLE_CALLCHAIN) configured events, for
instance, when using 'perf record -g' or 'perf trace --call-graph fp'.
This can only be done when no events are in use that have callchains
enabled, otherwise writing to this file will return -EBUSY.
The default value is 8.
==============================================================
pid_max:
PID allocation wrap value. When the kernel's next PID value

1
MAINTAINERS
View File

@ -8881,6 +8881,7 @@ F: arch/*/kernel/*/perf_event*.c
F: arch/*/kernel/*/*/perf_event*.c
F: arch/*/include/asm/perf_event.h
F: arch/*/kernel/perf_callchain.c
F: arch/*/events/*
F: tools/perf/
PERSONALITY HANDLING

6
arch/arc/kernel/perf_event.c
View File

@ -48,7 +48,7 @@ struct arc_callchain_trace {
static int callchain_trace(unsigned int addr, void *data)
{
struct arc_callchain_trace *ctrl = data;
struct perf_callchain_entry *entry = ctrl->perf_stuff;
struct perf_callchain_entry_ctx *entry = ctrl->perf_stuff;
perf_callchain_store(entry, addr);
if (ctrl->depth++ < 3)
@ -58,7 +58,7 @@ static int callchain_trace(unsigned int addr, void *data)
}
void
perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
struct arc_callchain_trace ctrl = {
.depth = 0,
@ -69,7 +69,7 @@ perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
}
void
perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
/*
* User stack can't be unwound trivially with kernel dwarf unwinder

10
arch/arm/kernel/perf_callchain.c
View File

@ -31,7 +31,7 @@ struct frame_tail {
*/
static struct frame_tail __user *
user_backtrace(struct frame_tail __user *tail,
struct perf_callchain_entry *entry)
struct perf_callchain_entry_ctx *entry)
{
struct frame_tail buftail;
unsigned long err;
@ -59,7 +59,7 @@ user_backtrace(struct frame_tail __user *tail,
}
void
perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
struct frame_tail __user *tail;
@ -75,7 +75,7 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
tail = (struct frame_tail __user *)regs->ARM_fp - 1;
while ((entry->nr < sysctl_perf_event_max_stack) &&
while ((entry->nr < entry->max_stack) &&
tail && !((unsigned long)tail & 0x3))
tail = user_backtrace(tail, entry);
}
@ -89,13 +89,13 @@ static int
callchain_trace(struct stackframe *fr,
void *data)
{
struct perf_callchain_entry *entry = data;
struct perf_callchain_entry_ctx *entry = data;
perf_callchain_store(entry, fr->pc);
return 0;
}
void
perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
struct stackframe fr;

14
arch/arm64/kernel/perf_callchain.c
View File

@ -31,7 +31,7 @@ struct frame_tail {
*/
static struct frame_tail __user *
user_backtrace(struct frame_tail __user *tail,
struct perf_callchain_entry *entry)
struct perf_callchain_entry_ctx *entry)
{
struct frame_tail buftail;
unsigned long err;
@ -76,7 +76,7 @@ struct compat_frame_tail {
static struct compat_frame_tail __user *
compat_user_backtrace(struct compat_frame_tail __user *tail,
struct perf_callchain_entry *entry)
struct perf_callchain_entry_ctx *entry)
{
struct compat_frame_tail buftail;
unsigned long err;
@ -106,7 +106,7 @@ compat_user_backtrace(struct compat_frame_tail __user *tail,
}
#endif /* CONFIG_COMPAT */
void perf_callchain_user(struct perf_callchain_entry *entry,
void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
@ -122,7 +122,7 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
tail = (struct frame_tail __user *)regs->regs[29];
while (entry->nr < sysctl_perf_event_max_stack &&
while (entry->nr < entry->max_stack &&
tail && !((unsigned long)tail & 0xf))
tail = user_backtrace(tail, entry);
} else {
@ -132,7 +132,7 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
tail = (struct compat_frame_tail __user *)regs->compat_fp - 1;
while ((entry->nr < sysctl_perf_event_max_stack) &&
while ((entry->nr < entry->max_stack) &&
tail && !((unsigned long)tail & 0x3))
tail = compat_user_backtrace(tail, entry);
#endif
@ -146,12 +146,12 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
*/
static int callchain_trace(struct stackframe *frame, void *data)
{
struct perf_callchain_entry *entry = data;
struct perf_callchain_entry_ctx *entry = data;
perf_callchain_store(entry, frame->pc);
return 0;
}
void perf_callchain_kernel(struct perf_callchain_entry *entry,
void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
struct stackframe frame;

10
arch/metag/kernel/perf_callchain.c
View File

@ -29,7 +29,7 @@ static bool is_valid_call(unsigned long calladdr)
static struct metag_frame __user *
user_backtrace(struct metag_frame __user *user_frame,
struct perf_callchain_entry *entry)
struct perf_callchain_entry_ctx *entry)
{
struct metag_frame frame;
unsigned long calladdr;
@ -56,7 +56,7 @@ user_backtrace(struct metag_frame __user *user_frame,
}
void
perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
unsigned long sp = regs->ctx.AX[0].U0;
struct metag_frame __user *frame;
@ -65,7 +65,7 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
--frame;
while ((entry->nr < sysctl_perf_event_max_stack) && frame)
while ((entry->nr < entry->max_stack) && frame)
frame = user_backtrace(frame, entry);
}
@ -78,13 +78,13 @@ static int
callchain_trace(struct stackframe *fr,
void *data)
{
struct perf_callchain_entry *entry = data;
struct perf_callchain_entry_ctx *entry = data;
perf_callchain_store(entry, fr->pc);
return 0;
}
void
perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
struct stackframe fr;

12
arch/mips/kernel/perf_event.c
View File

@ -25,8 +25,8 @@
* the user stack callchains, we will add it here.
*/
static void save_raw_perf_callchain(struct perf_callchain_entry *entry,
unsigned long reg29)
static void save_raw_perf_callchain(struct perf_callchain_entry_ctx *entry,
unsigned long reg29)
{
unsigned long *sp = (unsigned long *)reg29;
unsigned long addr;
@ -35,14 +35,14 @@ static void save_raw_perf_callchain(struct perf_callchain_entry *entry,
addr = *sp++;
if (__kernel_text_address(addr)) {
perf_callchain_store(entry, addr);
if (entry->nr >= sysctl_perf_event_max_stack)
if (entry->nr >= entry->max_stack)
break;
}
}
}
void perf_callchain_kernel(struct perf_callchain_entry *entry,
struct pt_regs *regs)
void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
unsigned long sp = regs->regs[29];
#ifdef CONFIG_KALLSYMS
@ -59,7 +59,7 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry,
}
do {
perf_callchain_store(entry, pc);
if (entry->nr >= sysctl_perf_event_max_stack)
if (entry->nr >= entry->max_stack)
break;
pc = unwind_stack(current, &sp, pc, &ra);
} while (pc);

20
arch/powerpc/perf/callchain.c
View File

@ -47,7 +47,7 @@ static int valid_next_sp(unsigned long sp, unsigned long prev_sp)
}
void
perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
unsigned long sp, next_sp;
unsigned long next_ip;
@ -76,7 +76,7 @@ perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
next_ip = regs->nip;
lr = regs->link;
level = 0;
perf_callchain_store(entry, PERF_CONTEXT_KERNEL);
perf_callchain_store_context(entry, PERF_CONTEXT_KERNEL);
} else {
if (level == 0)
@ -232,7 +232,7 @@ static int sane_signal_64_frame(unsigned long sp)
puc == (unsigned long) &sf->uc;
}
static void perf_callchain_user_64(struct perf_callchain_entry *entry,
static void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
unsigned long sp, next_sp;
@ -247,7 +247,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry *entry,
sp = regs->gpr[1];
perf_callchain_store(entry, next_ip);
while (entry->nr < sysctl_perf_event_max_stack) {
while (entry->nr < entry->max_stack) {
fp = (unsigned long __user *) sp;
if (!valid_user_sp(sp, 1) || read_user_stack_64(fp, &next_sp))
return;
@ -274,7 +274,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry *entry,
read_user_stack_64(&uregs[PT_R1], &sp))
return;
level = 0;
perf_callchain_store(entry, PERF_CONTEXT_USER);
perf_callchain_store_context(entry, PERF_CONTEXT_USER);
perf_callchain_store(entry, next_ip);
continue;
}
@ -319,7 +319,7 @@ static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret)
return rc;
}
static inline void perf_callchain_user_64(struct perf_callchain_entry *entry,
static inline void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
}
@ -439,7 +439,7 @@ static unsigned int __user *signal_frame_32_regs(unsigned int sp,
return mctx->mc_gregs;
}
static void perf_callchain_user_32(struct perf_callchain_entry *entry,
static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
unsigned int sp, next_sp;
@ -453,7 +453,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry *entry,
sp = regs->gpr[1];
perf_callchain_store(entry, next_ip);
while (entry->nr < sysctl_perf_event_max_stack) {
while (entry->nr < entry->max_stack) {
fp = (unsigned int __user *) (unsigned long) sp;
if (!valid_user_sp(sp, 0) || read_user_stack_32(fp, &next_sp))
return;
@ -473,7 +473,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry *entry,
read_user_stack_32(&uregs[PT_R1], &sp))
return;
level = 0;
perf_callchain_store(entry, PERF_CONTEXT_USER);
perf_callchain_store_context(entry, PERF_CONTEXT_USER);
perf_callchain_store(entry, next_ip);
continue;
}
@ -487,7 +487,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry *entry,
}
void
perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
if (current_is_64bit())
perf_callchain_user_64(entry, regs);

4
arch/s390/kernel/perf_event.c
View File

@ -224,13 +224,13 @@ arch_initcall(service_level_perf_register);
static int __perf_callchain_kernel(void *data, unsigned long address)
{
struct perf_callchain_entry *entry = data;
struct perf_callchain_entry_ctx *entry = data;
perf_callchain_store(entry, address);
return 0;
}
void perf_callchain_kernel(struct perf_callchain_entry *entry,
void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
if (user_mode(regs))

4
arch/sh/kernel/perf_callchain.c
View File

@ -21,7 +21,7 @@ static int callchain_stack(void *data, char *name)
static void callchain_address(void *data, unsigned long addr, int reliable)
{
struct perf_callchain_entry *entry = data;
struct perf_callchain_entry_ctx *entry = data;
if (reliable)
perf_callchain_store(entry, addr);
@ -33,7 +33,7 @@ static const struct stacktrace_ops callchain_ops = {
};
void
perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
perf_callchain_store(entry, regs->pc);

14
arch/sparc/kernel/perf_event.c
View File

@ -1711,7 +1711,7 @@ static int __init init_hw_perf_events(void)
}
pure_initcall(init_hw_perf_events);
void perf_callchain_kernel(struct perf_callchain_entry *entry,
void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
unsigned long ksp, fp;
@ -1756,7 +1756,7 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry,
}
}
#endif
} while (entry->nr < sysctl_perf_event_max_stack);
} while (entry->nr < entry->max_stack);
}
static inline int
@ -1769,7 +1769,7 @@ valid_user_frame(const void __user *fp, unsigned long size)
return (__range_not_ok(fp, size, TASK_SIZE) == 0);
}
static void perf_callchain_user_64(struct perf_callchain_entry *entry,
static void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
unsigned long ufp;
@ -1790,10 +1790,10 @@ static void perf_callchain_user_64(struct perf_callchain_entry *entry,
pc = sf.callers_pc;
ufp = (unsigned long)sf.fp + STACK_BIAS;
perf_callchain_store(entry, pc);
} while (entry->nr < sysctl_perf_event_max_stack);
} while (entry->nr < entry->max_stack);
}
static void perf_callchain_user_32(struct perf_callchain_entry *entry,
static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
unsigned long ufp;
@ -1822,11 +1822,11 @@ static void perf_callchain_user_32(struct perf_callchain_entry *entry,
ufp = (unsigned long)sf.fp;
}
perf_callchain_store(entry, pc);
} while (entry->nr < sysctl_perf_event_max_stack);
} while (entry->nr < entry->max_stack);
}
void
perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
u64 saved_fault_address = current_thread_info()->fault_address;
u8 saved_fault_code = get_thread_fault_code();

6
arch/tile/kernel/perf_event.c
View File

@ -941,7 +941,7 @@ arch_initcall(init_hw_perf_events);
/*
* Tile specific backtracing code for perf_events.
*/
static inline void perf_callchain(struct perf_callchain_entry *entry,
static inline void perf_callchain(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
struct KBacktraceIterator kbt;
@ -992,13 +992,13 @@ static inline void perf_callchain(struct perf_callchain_entry *entry,
}
}
void perf_callchain_user(struct perf_callchain_entry *entry,
void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
perf_callchain(entry, regs);
}
void perf_callchain_kernel(struct perf_callchain_entry *entry,
void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
perf_callchain(entry, regs);

14
arch/x86/events/core.c
View File

@ -2202,7 +2202,7 @@ static int backtrace_stack(void *data, char *name)
static int backtrace_address(void *data, unsigned long addr, int reliable)
{
struct perf_callchain_entry *entry = data;
struct perf_callchain_entry_ctx *entry = data;
return perf_callchain_store(entry, addr);
}
@ -2214,7 +2214,7 @@ static const struct stacktrace_ops backtrace_ops = {
};
void
perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
/* TODO: We don't support guest os callchain now */
@ -2268,7 +2268,7 @@ static unsigned long get_segment_base(unsigned int segment)
#include <asm/compat.h>
static inline int
perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry *entry)
perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry_ctx *entry)
{
/* 32-bit process in 64-bit kernel. */
unsigned long ss_base, cs_base;
@ -2283,7 +2283,7 @@ perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry *entry)
fp = compat_ptr(ss_base + regs->bp);
pagefault_disable();
while (entry->nr < sysctl_perf_event_max_stack) {
while (entry->nr < entry->max_stack) {
unsigned long bytes;
frame.next_frame = 0;
frame.return_address = 0;
@ -2309,14 +2309,14 @@ perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry *entry)
}
#else
static inline int
perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry *entry)
perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry_ctx *entry)
{
return 0;
}
#endif
void
perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{
struct stack_frame frame;
const void __user *fp;
@ -2343,7 +2343,7 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
return;
pagefault_disable();
while (entry->nr < sysctl_perf_event_max_stack) {
while (entry->nr < entry->max_stack) {
unsigned long bytes;
frame.next_frame = NULL;
frame.return_address = 0;

2
arch/x86/events/intel/p4.c
View File

@ -826,7 +826,7 @@ static int p4_hw_config(struct perf_event *event)
* Clear bits we reserve to be managed by kernel itself
* and never allowed from a user space
*/
event->attr.config &= P4_CONFIG_MASK;
event->attr.config &= P4_CONFIG_MASK;
rc = p4_validate_raw_event(event);
if (rc)

2
arch/x86/events/intel/uncore.c
View File

@ -891,7 +891,7 @@ static int uncore_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id
return -ENODEV;
pkg = topology_phys_to_logical_pkg(phys_id);
if (WARN_ON_ONCE(pkg < 0))
if (pkg < 0)
return -EINVAL;
if (UNCORE_PCI_DEV_TYPE(id->driver_data) == UNCORE_EXTRA_PCI_DEV) {

10
arch/xtensa/kernel/perf_event.c
View File

@ -323,23 +323,23 @@ static void xtensa_pmu_read(struct perf_event *event)
static int callchain_trace(struct stackframe *frame, void *data)
{
struct perf_callchain_entry *entry = data;
struct perf_callchain_entry_ctx *entry = data;
perf_callchain_store(entry, frame->pc);
return 0;
}
void perf_callchain_kernel(struct perf_callchain_entry *entry,
void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
xtensa_backtrace_kernel(regs, sysctl_perf_event_max_stack,
xtensa_backtrace_kernel(regs, entry->max_stack,
callchain_trace, NULL, entry);
}
void perf_callchain_user(struct perf_callchain_entry *entry,
void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
xtensa_backtrace_user(regs, sysctl_perf_event_max_stack,
xtensa_backtrace_user(regs, entry->max_stack,
callchain_trace, entry);
}

34
include/linux/perf_event.h
View File

@ -61,6 +61,14 @@ struct perf_callchain_entry {
__u64 ip[0]; /* /proc/sys/kernel/perf_event_max_stack */
};
struct perf_callchain_entry_ctx {
struct perf_callchain_entry *entry;
u32 max_stack;
u32 nr;
short contexts;
bool contexts_maxed;
};
struct perf_raw_record {
u32 size;
void *data;
@ -1061,20 +1069,36 @@ extern void perf_event_fork(struct task_struct *tsk);
/* Callchains */
DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
extern void perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs);
extern void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs);
extern struct perf_callchain_entry *
get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
bool crosstask, bool add_mark);
u32 max_stack, bool crosstask, bool add_mark);
extern int get_callchain_buffers(void);
extern void put_callchain_buffers(void);
extern int sysctl_perf_event_max_stack;
extern int sysctl_perf_event_max_contexts_per_stack;
static inline int perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
static inline int perf_callchain_store_context(struct perf_callchain_entry_ctx *ctx, u64 ip)
{
if (entry->nr < sysctl_perf_event_max_stack) {
if (ctx->contexts < sysctl_perf_event_max_contexts_per_stack) {
struct perf_callchain_entry *entry = ctx->entry;
entry->ip[entry->nr++] = ip;
++ctx->contexts;
return 0;
} else {
ctx->contexts_maxed = true;
return -1; /* no more room, stop walking the stack */
}
}
static inline int perf_callchain_store(struct perf_callchain_entry_ctx *ctx, u64 ip)
{
if (ctx->nr < ctx->max_stack && !ctx->contexts_maxed) {
struct perf_callchain_entry *entry = ctx->entry;
entry->ip[entry->nr++] = ip;
++ctx->nr;
return 0;
} else {
return -1; /* no more room, stop walking the stack */

1
include/uapi/linux/perf_event.h
View File

@ -862,6 +862,7 @@ enum perf_event_type {
};
#define PERF_MAX_STACK_DEPTH 127
#define PERF_MAX_CONTEXTS_PER_STACK 8
enum perf_callchain_context {
PERF_CONTEXT_HV = (__u64)-32,

3
kernel/bpf/stackmap.c
View File

@ -136,7 +136,8 @@ u64 bpf_get_stackid(u64 r1, u64 r2, u64 flags, u64 r4, u64 r5)
BPF_F_FAST_STACK_CMP | BPF_F_REUSE_STACKID)))
return -EINVAL;
trace = get_perf_callchain(regs, init_nr, kernel, user, false, false);
trace = get_perf_callchain(regs, init_nr, kernel, user,
sysctl_perf_event_max_stack, false, false);
if (unlikely(!trace))
/* couldn't fetch the stack trace */

36
kernel/events/callchain.c
View File

@ -19,11 +19,13 @@ struct callchain_cpus_entries {
};
int sysctl_perf_event_max_stack __read_mostly = PERF_MAX_STACK_DEPTH;
int sysctl_perf_event_max_contexts_per_stack __read_mostly = PERF_MAX_CONTEXTS_PER_STACK;
static inline size_t perf_callchain_entry__sizeof(void)
{
return (sizeof(struct perf_callchain_entry) +
sizeof(__u64) * sysctl_perf_event_max_stack);
sizeof(__u64) * (sysctl_perf_event_max_stack +
sysctl_perf_event_max_contexts_per_stack));
}
static DEFINE_PER_CPU(int, callchain_recursion[PERF_NR_CONTEXTS]);
@ -32,12 +34,12 @@ static DEFINE_MUTEX(callchain_mutex);
static struct callchain_cpus_entries *callchain_cpus_entries;
__weak void perf_callchain_kernel(struct perf_callchain_entry *entry,
__weak void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
}
__weak void perf_callchain_user(struct perf_callchain_entry *entry,
__weak void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
}
@ -176,14 +178,15 @@ perf_callchain(struct perf_event *event, struct pt_regs *regs)
if (!kernel && !user)
return NULL;
return get_perf_callchain(regs, 0, kernel, user, crosstask, true);
return get_perf_callchain(regs, 0, kernel, user, sysctl_perf_event_max_stack, crosstask, true);
}
struct perf_callchain_entry *
get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
bool crosstask, bool add_mark)
u32 max_stack, bool crosstask, bool add_mark)
{
struct perf_callchain_entry *entry;
struct perf_callchain_entry_ctx ctx;
int rctx;
entry = get_callchain_entry(&rctx);
@ -193,12 +196,16 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
if (!entry)
goto exit_put;
entry->nr = init_nr;
ctx.entry = entry;
ctx.max_stack = max_stack;
ctx.nr = entry->nr = init_nr;
ctx.contexts = 0;
ctx.contexts_maxed = false;
if (kernel && !user_mode(regs)) {
if (add_mark)
perf_callchain_store(entry, PERF_CONTEXT_KERNEL);
perf_callchain_kernel(entry, regs);
perf_callchain_store_context(&ctx, PERF_CONTEXT_KERNEL);
perf_callchain_kernel(&ctx, regs);
}
if (user) {
@ -214,8 +221,8 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
goto exit_put;
if (add_mark)
perf_callchain_store(entry, PERF_CONTEXT_USER);
perf_callchain_user(entry, regs);
perf_callchain_store_context(&ctx, PERF_CONTEXT_USER);
perf_callchain_user(&ctx, regs);
}
}
@ -225,10 +232,15 @@ exit_put:
return entry;
}
/*
* Used for sysctl_perf_event_max_stack and
* sysctl_perf_event_max_contexts_per_stack.
*/
int perf_event_max_stack_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int new_value = sysctl_perf_event_max_stack, ret;
int *value = table->data;
int new_value = *value, ret;
struct ctl_table new_table = *table;
new_table.data = &new_value;
@ -240,7 +252,7 @@ int perf_event_max_stack_handler(struct ctl_table *table, int write,
if (atomic_read(&nr_callchain_events))
ret = -EBUSY;
else
sysctl_perf_event_max_stack = new_value;
*value = new_value;
mutex_unlock(&callchain_mutex);

11
kernel/sysctl.c
View File

@ -1149,13 +1149,22 @@ static struct ctl_table kern_table[] = {
},
{
.procname = "perf_event_max_stack",
.data = NULL, /* filled in by handler */
.data = &sysctl_perf_event_max_stack,
.maxlen = sizeof(sysctl_perf_event_max_stack),
.mode = 0644,
.proc_handler = perf_event_max_stack_handler,
.extra1 = &zero,
.extra2 = &six_hundred_forty_kb,
},
{
.procname = "perf_event_max_contexts_per_stack",
.data = &sysctl_perf_event_max_contexts_per_stack,
.maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
.mode = 0644,
.proc_handler = perf_event_max_stack_handler,
.extra1 = &zero,
.extra2 = &one_thousand,
},
#endif
#ifdef CONFIG_KMEMCHECK
{

5
tools/perf/Documentation/perf-report.txt
View File

@ -103,12 +103,13 @@ OPTIONS
If --branch-stack option is used, following sort keys are also
available:
dso_from, dso_to, symbol_from, symbol_to, mispredict.
- dso_from: name of library or module branched from
- dso_to: name of library or module branched to
- symbol_from: name of function branched from
- symbol_to: name of function branched to
- srcline_from: source file and line branched from
- srcline_to: source file and line branched to
- mispredict: "N" for predicted branch, "Y" for mispredicted branch
- in_tx: branch in TSX transaction
- abort: TSX transaction abort.
@ -248,7 +249,7 @@ OPTIONS
Note that when using the --itrace option the synthesized callchain size
will override this value if the synthesized callchain size is bigger.
Default: /proc/sys/kernel/perf_event_max_stack when present, 127 otherwise.
Default: 127
-G::
--inverted::

2
tools/perf/Documentation/perf-script.txt
View File

@ -267,7 +267,7 @@ include::itrace.txt[]
Note that when using the --itrace option the synthesized callchain size
will override this value if the synthesized callchain size is bigger.
Default: /proc/sys/kernel/perf_event_max_stack when present, 127 otherwise.
Default: 127
--ns::
Use 9 decimal places when displaying time (i.e. show the nanoseconds)

3
tools/perf/Documentation/perf-trace.txt
View File

@ -143,7 +143,8 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
Implies '--call-graph dwarf' when --call-graph not present on the
command line, on systems where DWARF unwinding was built in.
Default: /proc/sys/kernel/perf_event_max_stack when present, 127 otherwise.
Default: /proc/sys/kernel/perf_event_max_stack when present for
live sessions (without --input/-i), 127 otherwise.
--min-stack::
Set the stack depth limit when parsing the callchain, anything

5
tools/perf/builtin-annotate.c
View File

@ -324,8 +324,9 @@ int cmd_annotate(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_BOOLEAN(0, "skip-missing", &annotate.skip_missing,
"Skip symbols that cannot be annotated"),
OPT_STRING('C', "cpu", &annotate.cpu_list, "cpu", "list of cpus to profile"),
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_CALLBACK(0, "symfs", NULL, "directory",
"Look for files with symbols relative to this directory",
symbol__config_symfs),
OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
"Interleave source code with assembly code (default)"),
OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,

8
tools/perf/builtin-buildid-cache.c
View File

@ -119,8 +119,8 @@ static int build_id_cache__add_kcore(const char *filename, bool force)
if (build_id_cache__kcore_buildid(from_dir, sbuildid) < 0)
return -1;
scnprintf(to_dir, sizeof(to_dir), "%s/[kernel.kcore]/%s",
buildid_dir, sbuildid);
scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s",
buildid_dir, DSO__NAME_KCORE, sbuildid);
if (!force &&
!build_id_cache__kcore_existing(from_dir, to_dir, sizeof(to_dir))) {
@ -131,8 +131,8 @@ static int build_id_cache__add_kcore(const char *filename, bool force)
if (build_id_cache__kcore_dir(dir, sizeof(dir)))
return -1;
scnprintf(to_dir, sizeof(to_dir), "%s/[kernel.kcore]/%s/%s",
buildid_dir, sbuildid, dir);
scnprintf(to_dir, sizeof(to_dir), "%s/%s/%s/%s",
buildid_dir, DSO__NAME_KCORE, sbuildid, dir);
if (mkdir_p(to_dir, 0755))
return -1;

5
tools/perf/builtin-diff.c
View File

@ -812,8 +812,9 @@ static const struct option options[] = {
OPT_STRING_NOEMPTY('t', "field-separator", &symbol_conf.field_sep, "separator",
"separator for columns, no spaces will be added between "
"columns '.' is reserved."),
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_CALLBACK(0, "symfs", NULL, "directory",
"Look for files with symbols relative to this directory",
symbol__config_symfs),
OPT_UINTEGER('o', "order", &sort_compute, "Specify compute sorting."),
OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
"How to display percentage of filtered entries", parse_filter_percentage),

81
tools/perf/builtin-record.c
View File

@ -40,6 +40,7 @@
#include <unistd.h>
#include <sched.h>
#include <sys/mman.h>
#include <asm/bug.h>
struct record {
@ -82,27 +83,87 @@ static int process_synthesized_event(struct perf_tool *tool,
return record__write(rec, event, event->header.size);
}
static int
backward_rb_find_range(void *buf, int mask, u64 head, u64 *start, u64 *end)
{
struct perf_event_header *pheader;
u64 evt_head = head;
int size = mask + 1;
pr_debug2("backward_rb_find_range: buf=%p, head=%"PRIx64"\n", buf, head);
pheader = (struct perf_event_header *)(buf + (head & mask));
*start = head;
while (true) {
if (evt_head - head >= (unsigned int)size) {
pr_debug("Finshed reading backward ring buffer: rewind\n");
if (evt_head - head > (unsigned int)size)
evt_head -= pheader->size;
*end = evt_head;
return 0;
}
pheader = (struct perf_event_header *)(buf + (evt_head & mask));
if (pheader->size == 0) {
pr_debug("Finshed reading backward ring buffer: get start\n");
*end = evt_head;
return 0;
}
evt_head += pheader->size;
pr_debug3("move evt_head: %"PRIx64"\n", evt_head);
}
WARN_ONCE(1, "Shouldn't get here\n");
return -1;
}
static int
rb_find_range(struct perf_evlist *evlist,
void *data, int mask, u64 head, u64 old,
u64 *start, u64 *end)
{
if (!evlist->backward) {
*start = old;
*end = head;
return 0;
}
return backward_rb_find_range(data, mask, head, start, end);
}
static int record__mmap_read(struct record *rec, int idx)
{
struct perf_mmap *md = &rec->evlist->mmap[idx];
u64 head = perf_mmap__read_head(md);
u64 old = md->prev;
u64 end = head, start = old;
unsigned char *data = md->base + page_size;
unsigned long size;
void *buf;
int rc = 0;
if (old == head)
if (rb_find_range(rec->evlist, data, md->mask, head,
old, &start, &end))
return -1;
if (start == end)
return 0;
rec->samples++;
size = head - old;
size = end - start;
if (size > (unsigned long)(md->mask) + 1) {
WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");
if ((old & md->mask) + size != (head & md->mask)) {
buf = &data[old & md->mask];
size = md->mask + 1 - (old & md->mask);
old += size;
md->prev = head;
perf_evlist__mmap_consume(rec->evlist, idx);
return 0;
}
if ((start & md->mask) + size != (end & md->mask)) {
buf = &data[start & md->mask];
size = md->mask + 1 - (start & md->mask);
start += size;
if (record__write(rec, buf, size) < 0) {
rc = -1;
@ -110,16 +171,16 @@ static int record__mmap_read(struct record *rec, int idx)
}
}
buf = &data[old & md->mask];
size = head - old;
old += size;
buf = &data[start & md->mask];
size = end - start;
start += size;
if (record__write(rec, buf, size) < 0) {
rc = -1;
goto out;
}
md->prev = old;
md->prev = head;
perf_evlist__mmap_consume(rec->evlist, idx);
out:
return rc;

7
tools/perf/builtin-report.c
View File

@ -691,7 +691,7 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
.ordered_events = true,
.ordering_requires_timestamps = true,
},
.max_stack = sysctl_perf_event_max_stack,
.max_stack = PERF_MAX_STACK_DEPTH,
.pretty_printing_style = "normal",
.socket_filter = -1,
};
@ -770,8 +770,9 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
"columns '.' is reserved."),
OPT_BOOLEAN('U', "hide-unresolved", &symbol_conf.hide_unresolved,
"Only display entries resolved to a symbol"),
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_CALLBACK(0, "symfs", NULL, "directory",
"Look for files with symbols relative to this directory",
symbol__config_symfs),
OPT_STRING('C', "cpu", &report.cpu_list, "cpu",
"list of cpus to profile"),
OPT_BOOLEAN('I', "show-info", &report.show_full_info,

7
tools/perf/builtin-script.c
View File

@ -2010,8 +2010,9 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
"file", "kallsyms pathname"),
OPT_BOOLEAN('G', "hide-call-graph", &no_callchain,
"When printing symbols do not display call chain"),
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_CALLBACK(0, "symfs", NULL, "directory",
"Look for files with symbols relative to this directory",
symbol__config_symfs),
OPT_CALLBACK('F', "fields", NULL, "str",
"comma separated output fields prepend with 'type:'. "
"Valid types: hw,sw,trace,raw. "
@ -2067,8 +2068,6 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
NULL
};
scripting_max_stack = sysctl_perf_event_max_stack;
setup_scripting();
argc = parse_options_subcommand(argc, argv, options, script_subcommands, script_usage,

22
tools/perf/builtin-stat.c
View File

@ -66,6 +66,7 @@
#include <stdlib.h>
#include <sys/prctl.h>
#include <locale.h>
#include <math.h>
#define DEFAULT_SEPARATOR " "
#define CNTR_NOT_SUPPORTED "<not supported>"
@ -991,12 +992,12 @@ static void abs_printout(int id, int nr, struct perf_evsel *evsel, double avg)
const char *fmt;
if (csv_output) {
fmt = sc != 1.0 ? "%.2f%s" : "%.0f%s";
fmt = floor(sc) != sc ? "%.2f%s" : "%.0f%s";
} else {
if (big_num)
fmt = sc != 1.0 ? "%'18.2f%s" : "%'18.0f%s";
fmt = floor(sc) != sc ? "%'18.2f%s" : "%'18.0f%s";
else
fmt = sc != 1.0 ? "%18.2f%s" : "%18.0f%s";
fmt = floor(sc) != sc ? "%18.2f%s" : "%18.0f%s";
}
aggr_printout(evsel, id, nr);
@ -1909,6 +1910,9 @@ static int add_default_attributes(void)
}
if (!evsel_list->nr_entries) {
if (target__has_cpu(&target))
default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK;
if (perf_evlist__add_default_attrs(evsel_list, default_attrs0) < 0)
return -1;
if (pmu_have_event("cpu", "stalled-cycles-frontend")) {
@ -2000,7 +2004,7 @@ static int process_stat_round_event(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_session *session)
{
struct stat_round_event *round = &event->stat_round;
struct stat_round_event *stat_round = &event->stat_round;
struct perf_evsel *counter;
struct timespec tsh, *ts = NULL;
const char **argv = session->header.env.cmdline_argv;
@ -2009,12 +2013,12 @@ static int process_stat_round_event(struct perf_tool *tool __maybe_unused,
evlist__for_each(evsel_list, counter)
perf_stat_process_counter(&stat_config, counter);
if (round->type == PERF_STAT_ROUND_TYPE__FINAL)
update_stats(&walltime_nsecs_stats, round->time);
if (stat_round->type == PERF_STAT_ROUND_TYPE__FINAL)
update_stats(&walltime_nsecs_stats, stat_round->time);
if (stat_config.interval && round->time) {
tsh.tv_sec = round->time / NSECS_PER_SEC;
tsh.tv_nsec = round->time % NSECS_PER_SEC;
if (stat_config.interval && stat_round->time) {
tsh.tv_sec = stat_round->time / NSECS_PER_SEC;
tsh.tv_nsec = stat_round->time % NSECS_PER_SEC;
ts = &tsh;
}

5
tools/perf/builtin-timechart.c
View File

@ -1945,8 +1945,9 @@ int cmd_timechart(int argc, const char **argv,
OPT_CALLBACK('p', "process", NULL, "process",
"process selector. Pass a pid or process name.",
parse_process),
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_CALLBACK(0, "symfs", NULL, "directory",
"Look for files with symbols relative to this directory",
symbol__config_symfs),
OPT_INTEGER('n', "proc-num", &tchart.proc_num,
"min. number of tasks to print"),
OPT_BOOLEAN('t', "topology", &tchart.topology,

6
tools/perf/builtin-top.c
View File

@ -732,7 +732,7 @@ static void perf_event__process_sample(struct perf_tool *tool,
if (machine__resolve(machine, &al, sample) < 0)
return;
if (!top->kptr_restrict_warned &&
if (!machine->kptr_restrict_warned &&
symbol_conf.kptr_restrict &&
al.cpumode == PERF_RECORD_MISC_KERNEL) {
ui__warning(
@ -743,7 +743,7 @@ static void perf_event__process_sample(struct perf_tool *tool,
" modules" : "");
if (use_browser <= 0)
sleep(5);
top->kptr_restrict_warned = true;
machine->kptr_restrict_warned = true;
}
if (al.sym == NULL) {
@ -759,7 +759,7 @@ static void perf_event__process_sample(struct perf_tool *tool,
* --hide-kernel-symbols, even if the user specifies an
* invalid --vmlinux ;-)
*/
if (!top->kptr_restrict_warned && !top->vmlinux_warned &&
if (!machine->kptr_restrict_warned && !top->vmlinux_warned &&
al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
if (symbol_conf.vmlinux_name) {

274
tools/perf/builtin-trace.c
View File

@ -576,84 +576,54 @@ static struct syscall_fmt {
bool hexret;
} syscall_fmts[] = {
{ .name = "access", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* filename */
[1] = SCA_ACCMODE, /* mode */ }, },
.arg_scnprintf = { [1] = SCA_ACCMODE, /* mode */ }, },
{ .name = "arch_prctl", .errmsg = true, .alias = "prctl", },
{ .name = "bpf", .errmsg = true, STRARRAY(0, cmd, bpf_cmd), },
{ .name = "brk", .hexret = true,
.arg_scnprintf = { [0] = SCA_HEX, /* brk */ }, },
{ .name = "chdir", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* filename */ }, },
{ .name = "chmod", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* filename */ }, },
{ .name = "chroot", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* filename */ }, },
{ .name = "chdir", .errmsg = true, },
{ .name = "chmod", .errmsg = true, },
{ .name = "chroot", .errmsg = true, },
{ .name = "clock_gettime", .errmsg = true, STRARRAY(0, clk_id, clockid), },
{ .name = "clone", .errpid = true, },
{ .name = "close", .errmsg = true,
.arg_scnprintf = { [0] = SCA_CLOSE_FD, /* fd */ }, },
{ .name = "connect", .errmsg = true, },
{ .name = "creat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "dup", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "dup2", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "dup3", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "creat", .errmsg = true, },
{ .name = "dup", .errmsg = true, },
{ .name = "dup2", .errmsg = true, },
{ .name = "dup3", .errmsg = true, },
{ .name = "epoll_ctl", .errmsg = true, STRARRAY(1, op, epoll_ctl_ops), },
{ .name = "eventfd2", .errmsg = true,
.arg_scnprintf = { [1] = SCA_EFD_FLAGS, /* flags */ }, },
{ .name = "faccessat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */
[1] = SCA_FILENAME, /* filename */ }, },
{ .name = "fadvise64", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "fallocate", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "fchdir", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "fchmod", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "faccessat", .errmsg = true, },
{ .name = "fadvise64", .errmsg = true, },
{ .name = "fallocate", .errmsg = true, },
{ .name = "fchdir", .errmsg = true, },
{ .name = "fchmod", .errmsg = true, },
{ .name = "fchmodat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* fd */
[1] = SCA_FILENAME, /* filename */ }, },
{ .name = "fchown", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
{ .name = "fchown", .errmsg = true, },
{ .name = "fchownat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* fd */
[1] = SCA_FILENAME, /* filename */ }, },
.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
{ .name = "fcntl", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */
[1] = SCA_STRARRAY, /* cmd */ },
.arg_scnprintf = { [1] = SCA_STRARRAY, /* cmd */ },
.arg_parm = { [1] = &strarray__fcntl_cmds, /* cmd */ }, },
{ .name = "fdatasync", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "fdatasync", .errmsg = true, },
{ .name = "flock", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */
[1] = SCA_FLOCK, /* cmd */ }, },
{ .name = "fsetxattr", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "fstat", .errmsg = true, .alias = "newfstat",
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "fstatat", .errmsg = true, .alias = "newfstatat",
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */
[1] = SCA_FILENAME, /* filename */ }, },
{ .name = "fstatfs", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "fsync", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "ftruncate", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
.arg_scnprintf = { [1] = SCA_FLOCK, /* cmd */ }, },
{ .name = "fsetxattr", .errmsg = true, },
{ .name = "fstat", .errmsg = true, .alias = "newfstat", },
{ .name = "fstatat", .errmsg = true, .alias = "newfstatat", },
{ .name = "fstatfs", .errmsg = true, },
{ .name = "fsync", .errmsg = true, },
{ .name = "ftruncate", .errmsg = true, },
{ .name = "futex", .errmsg = true,
.arg_scnprintf = { [1] = SCA_FUTEX_OP, /* op */ }, },
{ .name = "futimesat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* fd */
[1] = SCA_FILENAME, /* filename */ }, },
{ .name = "getdents", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "getdents64", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
{ .name = "getdents", .errmsg = true, },
{ .name = "getdents64", .errmsg = true, },
{ .name = "getitimer", .errmsg = true, STRARRAY(0, which, itimers), },
{ .name = "getpid", .errpid = true, },
{ .name = "getpgid", .errpid = true, },
@ -661,12 +631,10 @@ static struct syscall_fmt {
{ .name = "getrandom", .errmsg = true,
.arg_scnprintf = { [2] = SCA_GETRANDOM_FLAGS, /* flags */ }, },
{ .name = "getrlimit", .errmsg = true, STRARRAY(0, resource, rlimit_resources), },
{ .name = "getxattr", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "inotify_add_watch", .errmsg = true,
.arg_scnprintf = { [1] = SCA_FILENAME, /* pathname */ }, },
{ .name = "getxattr", .errmsg = true, },
{ .name = "inotify_add_watch", .errmsg = true, },
{ .name = "ioctl", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */
.arg_scnprintf = {
#if defined(__i386__) || defined(__x86_64__)
/*
* FIXME: Make this available to all arches.
@ -680,41 +648,28 @@ static struct syscall_fmt {
{ .name = "keyctl", .errmsg = true, STRARRAY(0, option, keyctl_options), },
{ .name = "kill", .errmsg = true,
.arg_scnprintf = { [1] = SCA_SIGNUM, /* sig */ }, },
{ .name = "lchown", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* filename */ }, },
{ .name = "lgetxattr", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "lchown", .errmsg = true, },
{ .name = "lgetxattr", .errmsg = true, },
{ .name = "linkat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
{ .name = "listxattr", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "llistxattr", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "lremovexattr", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "listxattr", .errmsg = true, },
{ .name = "llistxattr", .errmsg = true, },
{ .name = "lremovexattr", .errmsg = true, },
{ .name = "lseek", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */
[2] = SCA_STRARRAY, /* whence */ },
.arg_scnprintf = { [2] = SCA_STRARRAY, /* whence */ },
.arg_parm = { [2] = &strarray__whences, /* whence */ }, },
{ .name = "lsetxattr", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "lstat", .errmsg = true, .alias = "newlstat",
.arg_scnprintf = { [0] = SCA_FILENAME, /* filename */ }, },
{ .name = "lsxattr", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "lsetxattr", .errmsg = true, },
{ .name = "lstat", .errmsg = true, .alias = "newlstat", },
{ .name = "lsxattr", .errmsg = true, },
{ .name = "madvise", .errmsg = true,
.arg_scnprintf = { [0] = SCA_HEX, /* start */
[2] = SCA_MADV_BHV, /* behavior */ }, },
{ .name = "mkdir", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "mkdir", .errmsg = true, },
{ .name = "mkdirat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* fd */
[1] = SCA_FILENAME, /* pathname */ }, },
{ .name = "mknod", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* filename */ }, },
.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
{ .name = "mknod", .errmsg = true, },
{ .name = "mknodat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* fd */
[1] = SCA_FILENAME, /* filename */ }, },
.arg_scnprintf = { [0] = SCA_FDAT, /* fd */ }, },
{ .name = "mlock", .errmsg = true,
.arg_scnprintf = { [0] = SCA_HEX, /* addr */ }, },
{ .name = "mlockall", .errmsg = true,
@ -722,8 +677,7 @@ static struct syscall_fmt {
{ .name = "mmap", .hexret = true,
.arg_scnprintf = { [0] = SCA_HEX, /* addr */
[2] = SCA_MMAP_PROT, /* prot */
[3] = SCA_MMAP_FLAGS, /* flags */
[4] = SCA_FD, /* fd */ }, },
[3] = SCA_MMAP_FLAGS, /* flags */ }, },
{ .name = "mprotect", .errmsg = true,
.arg_scnprintf = { [0] = SCA_HEX, /* start */
[2] = SCA_MMAP_PROT, /* prot */ }, },
@ -740,17 +694,14 @@ static struct syscall_fmt {
{ .name = "name_to_handle_at", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
{ .name = "newfstatat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */
[1] = SCA_FILENAME, /* filename */ }, },
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
{ .name = "open", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* filename */
[1] = SCA_OPEN_FLAGS, /* flags */ }, },
.arg_scnprintf = { [1] = SCA_OPEN_FLAGS, /* flags */ }, },
{ .name = "open_by_handle_at", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */
[2] = SCA_OPEN_FLAGS, /* flags */ }, },
{ .name = "openat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */
[1] = SCA_FILENAME, /* filename */
[2] = SCA_OPEN_FLAGS, /* flags */ }, },
{ .name = "perf_event_open", .errmsg = true,
.arg_scnprintf = { [2] = SCA_INT, /* cpu */
@ -760,39 +711,26 @@ static struct syscall_fmt {
.arg_scnprintf = { [1] = SCA_PIPE_FLAGS, /* flags */ }, },
{ .name = "poll", .errmsg = true, .timeout = true, },
{ .name = "ppoll", .errmsg = true, .timeout = true, },
{ .name = "pread", .errmsg = true, .alias = "pread64",
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "preadv", .errmsg = true, .alias = "pread",
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "pread", .errmsg = true, .alias = "pread64", },
{ .name = "preadv", .errmsg = true, .alias = "pread", },
{ .name = "prlimit64", .errmsg = true, STRARRAY(1, resource, rlimit_resources), },
{ .name = "pwrite", .errmsg = true, .alias = "pwrite64",
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "pwritev", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "read", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "readlink", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* path */ }, },
{ .name = "pwrite", .errmsg = true, .alias = "pwrite64", },
{ .name = "pwritev", .errmsg = true, },
{ .name = "read", .errmsg = true, },
{ .name = "readlink", .errmsg = true, },
{ .name = "readlinkat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */
[1] = SCA_FILENAME, /* pathname */ }, },
{ .name = "readv", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
{ .name = "readv", .errmsg = true, },
{ .name = "recvfrom", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */
[3] = SCA_MSG_FLAGS, /* flags */ }, },
.arg_scnprintf = { [3] = SCA_MSG_FLAGS, /* flags */ }, },
{ .name = "recvmmsg", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */
[3] = SCA_MSG_FLAGS, /* flags */ }, },
.arg_scnprintf = { [3] = SCA_MSG_FLAGS, /* flags */ }, },
{ .name = "recvmsg", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */
[2] = SCA_MSG_FLAGS, /* flags */ }, },
{ .name = "removexattr", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
.arg_scnprintf = { [2] = SCA_MSG_FLAGS, /* flags */ }, },
{ .name = "removexattr", .errmsg = true, },
{ .name = "renameat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
{ .name = "rmdir", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "rmdir", .errmsg = true, },
{ .name = "rt_sigaction", .errmsg = true,
.arg_scnprintf = { [0] = SCA_SIGNUM, /* sig */ }, },
{ .name = "rt_sigprocmask", .errmsg = true, STRARRAY(0, how, sighow), },
@ -807,22 +745,17 @@ static struct syscall_fmt {
[1] = SCA_SECCOMP_FLAGS, /* flags */ }, },
{ .name = "select", .errmsg = true, .timeout = true, },
{ .name = "sendmmsg", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */
[3] = SCA_MSG_FLAGS, /* flags */ }, },
.arg_scnprintf = { [3] = SCA_MSG_FLAGS, /* flags */ }, },
{ .name = "sendmsg", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */
[2] = SCA_MSG_FLAGS, /* flags */ }, },
.arg_scnprintf = { [2] = SCA_MSG_FLAGS, /* flags */ }, },
{ .name = "sendto", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */
[3] = SCA_MSG_FLAGS, /* flags */ }, },
.arg_scnprintf = { [3] = SCA_MSG_FLAGS, /* flags */ }, },
{ .name = "set_tid_address", .errpid = true, },
{ .name = "setitimer", .errmsg = true, STRARRAY(0, which, itimers), },
{ .name = "setpgid", .errmsg = true, },
{ .name = "setrlimit", .errmsg = true, STRARRAY(0, resource, rlimit_resources), },
{ .name = "setxattr", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "shutdown", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "setxattr", .errmsg = true, },
{ .name = "shutdown", .errmsg = true, },
{ .name = "socket", .errmsg = true,
.arg_scnprintf = { [0] = SCA_STRARRAY, /* family */
[1] = SCA_SK_TYPE, /* type */ },
@ -831,10 +764,8 @@ static struct syscall_fmt {
.arg_scnprintf = { [0] = SCA_STRARRAY, /* family */
[1] = SCA_SK_TYPE, /* type */ },
.arg_parm = { [0] = &strarray__socket_families, /* family */ }, },
{ .name = "stat", .errmsg = true, .alias = "newstat",
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "statfs", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* pathname */ }, },
{ .name = "stat", .errmsg = true, .alias = "newstat", },
{ .name = "statfs", .errmsg = true, },
{ .name = "swapoff", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* specialfile */ }, },
{ .name = "swapon", .errmsg = true,
@ -845,29 +776,21 @@ static struct syscall_fmt {
.arg_scnprintf = { [2] = SCA_SIGNUM, /* sig */ }, },
{ .name = "tkill", .errmsg = true,
.arg_scnprintf = { [1] = SCA_SIGNUM, /* sig */ }, },
{ .name = "truncate", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* path */ }, },
{ .name = "truncate", .errmsg = true, },
{ .name = "uname", .errmsg = true, .alias = "newuname", },
{ .name = "unlinkat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */
[1] = SCA_FILENAME, /* pathname */ }, },
{ .name = "utime", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* filename */ }, },
.arg_scnprintf = { [0] = SCA_FDAT, /* dfd */ }, },
{ .name = "utime", .errmsg = true, },
{ .name = "utimensat", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FDAT, /* dirfd */
[1] = SCA_FILENAME, /* filename */ }, },
{ .name = "utimes", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FILENAME, /* filename */ }, },
{ .name = "vmsplice", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
.arg_scnprintf = { [0] = SCA_FDAT, /* dirfd */ }, },
{ .name = "utimes", .errmsg = true, },
{ .name = "vmsplice", .errmsg = true, },
{ .name = "wait4", .errpid = true,
.arg_scnprintf = { [2] = SCA_WAITID_OPTIONS, /* options */ }, },
{ .name = "waitid", .errpid = true,
.arg_scnprintf = { [3] = SCA_WAITID_OPTIONS, /* options */ }, },
{ .name = "write", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "writev", .errmsg = true,
.arg_scnprintf = { [0] = SCA_FD, /* fd */ }, },
{ .name = "write", .errmsg = true, },
{ .name = "writev", .errmsg = true, },
};
static int syscall_fmt__cmp(const void *name, const void *fmtp)
@ -1160,6 +1083,24 @@ static int trace__tool_process(struct perf_tool *tool,
return trace__process_event(trace, machine, event, sample);
}
static char *trace__machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp)
{
struct machine *machine = vmachine;
if (machine->kptr_restrict_warned)
return NULL;
if (symbol_conf.kptr_restrict) {
pr_warning("Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
"Check /proc/sys/kernel/kptr_restrict.\n\n"
"Kernel samples will not be resolved.\n");
machine->kptr_restrict_warned = true;
return NULL;
}
return machine__resolve_kernel_addr(vmachine, addrp, modp);
}
static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
{
int err = symbol__init(NULL);
@ -1171,7 +1112,7 @@ static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
if (trace->host == NULL)
return -ENOMEM;
if (trace_event__register_resolver(trace->host, machine__resolve_kernel_addr) < 0)
if (trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr) < 0)
return -errno;
err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
@ -1186,7 +1127,7 @@ static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
static int syscall__set_arg_fmts(struct syscall *sc)
{
struct format_field *field;
int idx = 0;
int idx = 0, len;
sc->arg_scnprintf = calloc(sc->nr_args, sizeof(void *));
if (sc->arg_scnprintf == NULL)
@ -1198,12 +1139,31 @@ static int syscall__set_arg_fmts(struct syscall *sc)
for (field = sc->args; field; field = field->next) {
if (sc->fmt && sc->fmt->arg_scnprintf[idx])
sc->arg_scnprintf[idx] = sc->fmt->arg_scnprintf[idx];
else if (strcmp(field->type, "const char *") == 0 &&
(strcmp(field->name, "filename") == 0 ||
strcmp(field->name, "path") == 0 ||
strcmp(field->name, "pathname") == 0))
sc->arg_scnprintf[idx] = SCA_FILENAME;
else if (field->flags & FIELD_IS_POINTER)
sc->arg_scnprintf[idx] = syscall_arg__scnprintf_hex;
else if (strcmp(field->type, "pid_t") == 0)
sc->arg_scnprintf[idx] = SCA_PID;
else if (strcmp(field->type, "umode_t") == 0)
sc->arg_scnprintf[idx] = SCA_MODE_T;
else if ((strcmp(field->type, "int") == 0 ||
strcmp(field->type, "unsigned int") == 0 ||
strcmp(field->type, "long") == 0) &&
(len = strlen(field->name)) >= 2 &&
strcmp(field->name + len - 2, "fd") == 0) {
/*
* /sys/kernel/tracing/events/syscalls/sys_enter*
* egrep 'field:.*fd;' .../format|sed -r 's/.*field:([a-z ]+) [a-z_]*fd.+/\1/g'|sort|uniq -c
* 65 int
* 23 unsigned int
* 7 unsigned long
*/
sc->arg_scnprintf[idx] = SCA_FD;
}
++idx;
}
@ -1534,7 +1494,7 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
if (sc->is_exit) {
if (!(trace->duration_filter || trace->summary_only || trace->min_stack)) {
trace__fprintf_entry_head(trace, thread, 1, sample->time, trace->output);
fprintf(trace->output, "%-70s\n", ttrace->entry_str);
fprintf(trace->output, "%-70s)\n", ttrace->entry_str);
}
} else {
ttrace->entry_pending = true;
@ -2887,12 +2847,12 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
mmap_pages_user_set = false;
if (trace.max_stack == UINT_MAX) {
trace.max_stack = sysctl_perf_event_max_stack;
trace.max_stack = input_name ? PERF_MAX_STACK_DEPTH : sysctl_perf_event_max_stack;
max_stack_user_set = false;
}
#ifdef HAVE_DWARF_UNWIND_SUPPORT
if ((trace.min_stack || max_stack_user_set) && !callchain_param.enabled)
if ((trace.min_stack || max_stack_user_set) && !callchain_param.enabled && trace.trace_syscalls)
record_opts__parse_callchain(&trace.opts, &callchain_param, "dwarf", false);
#endif

3
tools/perf/perf.c
View File

@ -549,6 +549,9 @@ int main(int argc, const char **argv)
if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0)
sysctl_perf_event_max_stack = value;
if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0)
sysctl_perf_event_max_contexts_per_stack = value;
cmd = extract_argv0_path(argv[0]);
if (!cmd)
cmd = "perf-help";

34
tools/perf/util/annotate.c
View File

@ -354,9 +354,6 @@ static struct ins_ops nop_ops = {
.scnprintf = nop__scnprintf,
};
/*
* Must be sorted by name!
*/
static struct ins instructions[] = {
{ .name = "add", .ops = &mov_ops, },
{ .name = "addl", .ops = &mov_ops, },
@ -372,8 +369,8 @@ static struct ins instructions[] = {
{ .name = "bgt", .ops = &jump_ops, },
{ .name = "bhi", .ops = &jump_ops, },
{ .name = "bl", .ops = &call_ops, },
{ .name = "blt", .ops = &jump_ops, },
{ .name = "bls", .ops = &jump_ops, },
{ .name = "blt", .ops = &jump_ops, },
{ .name = "blx", .ops = &call_ops, },
{ .name = "bne", .ops = &jump_ops, },
#endif
@ -449,18 +446,39 @@ static struct ins instructions[] = {
{ .name = "xbeginq", .ops = &jump_ops, },
};
static int ins__cmp(const void *name, const void *insp)
static int ins__key_cmp(const void *name, const void *insp)
{
const struct ins *ins = insp;
return strcmp(name, ins->name);
}
static struct ins *ins__find(const char *name)
static int ins__cmp(const void *a, const void *b)
{
const struct ins *ia = a;
const struct ins *ib = b;
return strcmp(ia->name, ib->name);
}
static void ins__sort(void)
{
const int nmemb = ARRAY_SIZE(instructions);
return bsearch(name, instructions, nmemb, sizeof(struct ins), ins__cmp);
qsort(instructions, nmemb, sizeof(struct ins), ins__cmp);
}
static struct ins *ins__find(const char *name)
{
const int nmemb = ARRAY_SIZE(instructions);
static bool sorted;
if (!sorted) {
ins__sort();
sorted = true;
}
return bsearch(name, instructions, nmemb, sizeof(struct ins), ins__key_cmp);
}
int symbol__annotate_init(struct map *map __maybe_unused, struct symbol *sym)
@ -1122,7 +1140,7 @@ int symbol__annotate(struct symbol *sym, struct map *map, size_t privsize)
} else if (dso__is_kcore(dso)) {
goto fallback;
} else if (readlink(symfs_filename, command, sizeof(command)) < 0 ||
strstr(command, "[kernel.kallsyms]") ||
strstr(command, DSO__NAME_KALLSYMS) ||
access(symfs_filename, R_OK)) {
free(filename);
fallback:

2
tools/perf/util/build-id.c
View File

@ -256,7 +256,7 @@ static int machine__write_buildid_table(struct machine *machine, int fd)
size_t name_len;
bool in_kernel = false;
if (!pos->hit)
if (!pos->hit && !dso__is_vdso(pos))
continue;
if (dso__is_vdso(pos)) {

3
tools/perf/util/db-export.c
View File

@ -298,8 +298,7 @@ static struct call_path *call_path_from_sample(struct db_export *dbe,
*/
callchain_param.order = ORDER_CALLER;
err = thread__resolve_callchain(thread, &callchain_cursor, evsel,
sample, NULL, NULL,
sysctl_perf_event_max_stack);
sample, NULL, NULL, PERF_MAX_STACK_DEPTH);
if (err) {
callchain_param.order = saved_order;
return NULL;

7
tools/perf/util/dso.c
View File

@ -7,6 +7,7 @@
#include "auxtrace.h"
#include "util.h"
#include "debug.h"
#include "vdso.h"
char dso__symtab_origin(const struct dso *dso)
{
@ -62,9 +63,7 @@ int dso__read_binary_type_filename(const struct dso *dso,
}
break;
case DSO_BINARY_TYPE__BUILD_ID_CACHE:
/* skip the locally configured cache if a symfs is given */
if (symbol_conf.symfs[0] ||
(dso__build_id_filename(dso, filename, size) == NULL))
if (dso__build_id_filename(dso, filename, size) == NULL)
ret = -1;
break;
@ -1169,7 +1168,7 @@ bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
struct dso *pos;
list_for_each_entry(pos, head, node) {
if (with_hits && !pos->hit)
if (with_hits && !pos->hit && !dso__is_vdso(pos))
continue;
if (pos->has_build_id) {
have_build_id = true;

34
tools/perf/util/evlist.c
View File

@ -44,6 +44,7 @@ void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
perf_evlist__set_maps(evlist, cpus, threads);
fdarray__init(&evlist->pollfd, 64);
evlist->workload.pid = -1;
evlist->backward = false;
}
struct perf_evlist *perf_evlist__new(void)
@ -679,6 +680,33 @@ static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
return NULL;
}
static int perf_evlist__set_paused(struct perf_evlist *evlist, bool value)
{
int i;
for (i = 0; i < evlist->nr_mmaps; i++) {
int fd = evlist->mmap[i].fd;
int err;
if (fd < 0)
continue;
err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
if (err)
return err;
}
return 0;
}
int perf_evlist__pause(struct perf_evlist *evlist)
{
return perf_evlist__set_paused(evlist, true);
}
int perf_evlist__resume(struct perf_evlist *evlist)
{
return perf_evlist__set_paused(evlist, false);
}
/* When check_messup is true, 'end' must points to a good entry */
static union perf_event *
perf_mmap__read(struct perf_mmap *md, bool check_messup, u64 start,
@ -881,6 +909,7 @@ static void __perf_evlist__munmap(struct perf_evlist *evlist, int idx)
if (evlist->mmap[idx].base != NULL) {
munmap(evlist->mmap[idx].base, evlist->mmap_len);
evlist->mmap[idx].base = NULL;
evlist->mmap[idx].fd = -1;
atomic_set(&evlist->mmap[idx].refcnt, 0);
}
auxtrace_mmap__munmap(&evlist->mmap[idx].auxtrace_mmap);
@ -901,10 +930,14 @@ void perf_evlist__munmap(struct perf_evlist *evlist)
static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
{
int i;
evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
if (cpu_map__empty(evlist->cpus))
evlist->nr_mmaps = thread_map__nr(evlist->threads);
evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
for (i = 0; i < evlist->nr_mmaps; i++)
evlist->mmap[i].fd = -1;
return evlist->mmap != NULL ? 0 : -ENOMEM;
}
@ -941,6 +974,7 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx,
evlist->mmap[idx].base = NULL;
return -1;
}
evlist->mmap[idx].fd = fd;
if (auxtrace_mmap__mmap(&evlist->mmap[idx].auxtrace_mmap,
&mp->auxtrace_mp, evlist->mmap[idx].base, fd))

4
tools/perf/util/evlist.h
View File

@ -28,6 +28,7 @@ struct record_opts;
struct perf_mmap {
void *base;
int mask;
int fd;
atomic_t refcnt;
u64 prev;
struct auxtrace_mmap auxtrace_mmap;
@ -43,6 +44,7 @@ struct perf_evlist {
bool overwrite;
bool enabled;
bool has_user_cpus;
bool backward;
size_t mmap_len;
int id_pos;
int is_pos;
@ -135,6 +137,8 @@ void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx);
void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx);
int perf_evlist__pause(struct perf_evlist *evlist);
int perf_evlist__resume(struct perf_evlist *evlist);
int perf_evlist__open(struct perf_evlist *evlist);
void perf_evlist__close(struct perf_evlist *evlist);

13
tools/perf/util/evsel.c
View File

@ -37,6 +37,7 @@ static struct {
bool clockid;
bool clockid_wrong;
bool lbr_flags;
bool write_backward;
} perf_missing_features;
static clockid_t clockid;
@ -1376,6 +1377,8 @@ fallback_missing_features:
if (perf_missing_features.lbr_flags)
evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
PERF_SAMPLE_BRANCH_NO_CYCLES);
if (perf_missing_features.write_backward)
evsel->attr.write_backward = false;
retry_sample_id:
if (perf_missing_features.sample_id_all)
evsel->attr.sample_id_all = 0;
@ -1438,6 +1441,12 @@ retry_open:
err = -EINVAL;
goto out_close;
}
if (evsel->overwrite &&
perf_missing_features.write_backward) {
err = -EINVAL;
goto out_close;
}
}
}
@ -1500,6 +1509,10 @@ try_fallback:
PERF_SAMPLE_BRANCH_NO_FLAGS))) {
perf_missing_features.lbr_flags = true;
goto fallback_missing_features;
} else if (!perf_missing_features.write_backward &&
evsel->attr.write_backward) {
perf_missing_features.write_backward = true;
goto fallback_missing_features;
}
out_close:

1
tools/perf/util/evsel.h
View File

@ -112,6 +112,7 @@ struct perf_evsel {
bool tracking;
bool per_pkg;
bool precise_max;
bool overwrite;
/* parse modifier helper */
int exclude_GH;
int nr_members;

9
tools/perf/util/hist.c
View File

@ -117,6 +117,13 @@ void hists__calc_col_len(struct hists *hists, struct hist_entry *h)
hists__new_col_len(hists, HISTC_SYMBOL_TO, symlen);
hists__set_unres_dso_col_len(hists, HISTC_DSO_TO);
}
if (h->branch_info->srcline_from)
hists__new_col_len(hists, HISTC_SRCLINE_FROM,
strlen(h->branch_info->srcline_from));
if (h->branch_info->srcline_to)
hists__new_col_len(hists, HISTC_SRCLINE_TO,
strlen(h->branch_info->srcline_to));
}
if (h->mem_info) {
@ -1042,6 +1049,8 @@ void hist_entry__delete(struct hist_entry *he)
if (he->branch_info) {
map__zput(he->branch_info->from.map);
map__zput(he->branch_info->to.map);
free_srcline(he->branch_info->srcline_from);
free_srcline(he->branch_info->srcline_to);
zfree(&he->branch_info);
}

2
tools/perf/util/hist.h
View File

@ -52,6 +52,8 @@ enum hist_column {
HISTC_MEM_IADDR_SYMBOL,
HISTC_TRANSACTION,
HISTC_CYCLES,
HISTC_SRCLINE_FROM,
HISTC_SRCLINE_TO,
HISTC_TRACE,
HISTC_NR_COLS, /* Last entry */
};

35
tools/perf/util/machine.c
View File

@ -43,6 +43,7 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
machine->symbol_filter = NULL;
machine->id_hdr_size = 0;
machine->kptr_restrict_warned = false;
machine->comm_exec = false;
machine->kernel_start = 0;
@ -709,7 +710,7 @@ static struct dso *machine__get_kernel(struct machine *machine)
if (machine__is_host(machine)) {
vmlinux_name = symbol_conf.vmlinux_name;
if (!vmlinux_name)
vmlinux_name = "[kernel.kallsyms]";
vmlinux_name = DSO__NAME_KALLSYMS;
kernel = machine__findnew_kernel(machine, vmlinux_name,
"[kernel]", DSO_TYPE_KERNEL);
@ -1135,10 +1136,10 @@ int machine__create_kernel_maps(struct machine *machine)
{
struct dso *kernel = machine__get_kernel(machine);
const char *name;
u64 addr = machine__get_running_kernel_start(machine, &name);
u64 addr;
int ret;
if (!addr || kernel == NULL)
if (kernel == NULL)
return -1;
ret = __machine__create_kernel_maps(machine, kernel);
@ -1160,8 +1161,9 @@ int machine__create_kernel_maps(struct machine *machine)
*/
map_groups__fixup_end(&machine->kmaps);
if (maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name,
addr)) {
addr = machine__get_running_kernel_start(machine, &name);
if (!addr) {
} else if (maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name, addr)) {
machine__destroy_kernel_maps(machine);
return -1;
}
@ -1769,11 +1771,6 @@ static int resolve_lbr_callchain_sample(struct thread *thread,
*/
int mix_chain_nr = i + 1 + lbr_nr + 1;
if (mix_chain_nr > (int)sysctl_perf_event_max_stack + PERF_MAX_BRANCH_DEPTH) {
pr_warning("corrupted callchain. skipping...\n");
return 0;
}
for (j = 0; j < mix_chain_nr; j++) {
if (callchain_param.order == ORDER_CALLEE) {
if (j < i + 1)
@ -1811,9 +1808,9 @@ static int thread__resolve_callchain_sample(struct thread *thread,
{
struct branch_stack *branch = sample->branch_stack;
struct ip_callchain *chain = sample->callchain;
int chain_nr = min(max_stack, (int)chain->nr);
int chain_nr = chain->nr;
u8 cpumode = PERF_RECORD_MISC_USER;
int i, j, err;
int i, j, err, nr_entries;
int skip_idx = -1;
int first_call = 0;
@ -1828,8 +1825,7 @@ static int thread__resolve_callchain_sample(struct thread *thread,
* Based on DWARF debug information, some architectures skip
* a callchain entry saved by the kernel.
*/
if (chain->nr < sysctl_perf_event_max_stack)
skip_idx = arch_skip_callchain_idx(thread, chain);
skip_idx = arch_skip_callchain_idx(thread, chain);
/*
* Add branches to call stack for easier browsing. This gives
@ -1889,12 +1885,8 @@ static int thread__resolve_callchain_sample(struct thread *thread,
}
check_calls:
if (chain->nr > sysctl_perf_event_max_stack && (int)chain->nr > max_stack) {
pr_warning("corrupted callchain. skipping...\n");
return 0;
}
for (i = first_call; i < chain_nr; i++) {
for (i = first_call, nr_entries = 0;
i < chain_nr && nr_entries < max_stack; i++) {
u64 ip;
if (callchain_param.order == ORDER_CALLEE)
@ -1908,6 +1900,9 @@ check_calls:
#endif
ip = chain->ips[j];
if (ip < PERF_CONTEXT_MAX)
++nr_entries;
err = add_callchain_ip(thread, cursor, parent, root_al, &cpumode, ip);
if (err)

1
tools/perf/util/machine.h
View File

@ -28,6 +28,7 @@ struct machine {
pid_t pid;
u16 id_hdr_size;
bool comm_exec;
bool kptr_restrict_warned;
char *root_dir;
struct rb_root threads;
pthread_rwlock_t threads_lock;

3
tools/perf/util/scripting-engines/trace-event-perl.c
View File

@ -264,8 +264,7 @@ static SV *perl_process_callchain(struct perf_sample *sample,
goto exit;
if (thread__resolve_callchain(al->thread, &callchain_cursor, evsel,
sample, NULL, NULL,
sysctl_perf_event_max_stack) != 0) {
sample, NULL, NULL, scripting_max_stack) != 0) {
pr_err("Failed to resolve callchain. Skipping\n");
goto exit;
}

84
tools/perf/util/sort.c
View File

@ -353,6 +353,88 @@ struct sort_entry sort_srcline = {
.se_width_idx = HISTC_SRCLINE,
};
/* --sort srcline_from */
static int64_t
sort__srcline_from_cmp(struct hist_entry *left, struct hist_entry *right)
{
if (!left->branch_info->srcline_from) {
struct map *map = left->branch_info->from.map;
if (!map)
left->branch_info->srcline_from = SRCLINE_UNKNOWN;
else
left->branch_info->srcline_from = get_srcline(map->dso,
map__rip_2objdump(map,
left->branch_info->from.al_addr),
left->branch_info->from.sym, true);
}
if (!right->branch_info->srcline_from) {
struct map *map = right->branch_info->from.map;
if (!map)
right->branch_info->srcline_from = SRCLINE_UNKNOWN;
else
right->branch_info->srcline_from = get_srcline(map->dso,
map__rip_2objdump(map,
right->branch_info->from.al_addr),
right->branch_info->from.sym, true);
}
return strcmp(right->branch_info->srcline_from, left->branch_info->srcline_from);
}
static int hist_entry__srcline_from_snprintf(struct hist_entry *he, char *bf,
size_t size, unsigned int width)
{
return repsep_snprintf(bf, size, "%-*.*s", width, width, he->branch_info->srcline_from);
}
struct sort_entry sort_srcline_from = {
.se_header = "From Source:Line",
.se_cmp = sort__srcline_from_cmp,
.se_snprintf = hist_entry__srcline_from_snprintf,
.se_width_idx = HISTC_SRCLINE_FROM,
};
/* --sort srcline_to */
static int64_t
sort__srcline_to_cmp(struct hist_entry *left, struct hist_entry *right)
{
if (!left->branch_info->srcline_to) {
struct map *map = left->branch_info->to.map;
if (!map)
left->branch_info->srcline_to = SRCLINE_UNKNOWN;
else
left->branch_info->srcline_to = get_srcline(map->dso,
map__rip_2objdump(map,
left->branch_info->to.al_addr),
left->branch_info->from.sym, true);
}
if (!right->branch_info->srcline_to) {
struct map *map = right->branch_info->to.map;
if (!map)
right->branch_info->srcline_to = SRCLINE_UNKNOWN;
else
right->branch_info->srcline_to = get_srcline(map->dso,
map__rip_2objdump(map,
right->branch_info->to.al_addr),
right->branch_info->to.sym, true);
}
return strcmp(right->branch_info->srcline_to, left->branch_info->srcline_to);
}
static int hist_entry__srcline_to_snprintf(struct hist_entry *he, char *bf,
size_t size, unsigned int width)
{
return repsep_snprintf(bf, size, "%-*.*s", width, width, he->branch_info->srcline_to);
}
struct sort_entry sort_srcline_to = {
.se_header = "To Source:Line",
.se_cmp = sort__srcline_to_cmp,
.se_snprintf = hist_entry__srcline_to_snprintf,
.se_width_idx = HISTC_SRCLINE_TO,
};
/* --sort srcfile */
static char no_srcfile[1];
@ -1347,6 +1429,8 @@ static struct sort_dimension bstack_sort_dimensions[] = {
DIM(SORT_IN_TX, "in_tx", sort_in_tx),
DIM(SORT_ABORT, "abort", sort_abort),
DIM(SORT_CYCLES, "cycles", sort_cycles),
DIM(SORT_SRCLINE_FROM, "srcline_from", sort_srcline_from),
DIM(SORT_SRCLINE_TO, "srcline_to", sort_srcline_to),
};
#undef DIM

2
tools/perf/util/sort.h
View File

@ -215,6 +215,8 @@ enum sort_type {
SORT_ABORT,
SORT_IN_TX,
SORT_CYCLES,
SORT_SRCLINE_FROM,
SORT_SRCLINE_TO,
/* memory mode specific sort keys */
__SORT_MEMORY_MODE,

8
tools/perf/util/stat-shadow.c
View File

@ -94,7 +94,8 @@ void perf_stat__update_shadow_stats(struct perf_evsel *counter, u64 *count,
{
int ctx = evsel_context(counter);
if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK) ||
perf_evsel__match(counter, SOFTWARE, SW_CPU_CLOCK))
update_stats(&runtime_nsecs_stats[cpu], count[0]);
else if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
update_stats(&runtime_cycles_stats[ctx][cpu], count[0]);
@ -188,7 +189,7 @@ static void print_stalled_cycles_backend(int cpu,
color = get_ratio_color(GRC_STALLED_CYCLES_BE, ratio);
out->print_metric(out->ctx, color, "%6.2f%%", "backend cycles idle", ratio);
out->print_metric(out->ctx, color, "%7.2f%%", "backend cycles idle", ratio);
}
static void print_branch_misses(int cpu,
@ -444,7 +445,8 @@ void perf_stat__print_shadow_stats(struct perf_evsel *evsel,
ratio = total / avg;
print_metric(ctxp, NULL, "%8.0f", "cycles / elision", ratio);
} else if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK)) {
} else if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK) ||
perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK)) {
if ((ratio = avg_stats(&walltime_nsecs_stats)) != 0)
print_metric(ctxp, NULL, "%8.3f", "CPUs utilized",
avg / ratio);

33
tools/perf/util/symbol.c
View File

@ -1662,8 +1662,8 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
sbuild_id);
scnprintf(path, sizeof(path), "%s/%s/%s", buildid_dir,
DSO__NAME_KCORE, sbuild_id);
/* Use /proc/kallsyms if possible */
if (is_host) {
@ -1699,8 +1699,8 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
if (!find_matching_kcore(map, path, sizeof(path)))
return strdup(path);
scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
buildid_dir, sbuild_id);
scnprintf(path, sizeof(path), "%s/%s/%s",
buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
if (access(path, F_OK)) {
pr_err("No kallsyms or vmlinux with build-id %s was found\n",
@ -1769,7 +1769,7 @@ do_kallsyms:
if (err > 0 && !dso__is_kcore(dso)) {
dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
dso__set_long_name(dso, "[kernel.kallsyms]", false);
dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
map__fixup_start(map);
map__fixup_end(map);
}
@ -2033,3 +2033,26 @@ void symbol__exit(void)
symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
symbol_conf.initialized = false;
}
int symbol__config_symfs(const struct option *opt __maybe_unused,
const char *dir, int unset __maybe_unused)
{
char *bf = NULL;
int ret;
symbol_conf.symfs = strdup(dir);
if (symbol_conf.symfs == NULL)
return -ENOMEM;
/* skip the locally configured cache if a symfs is given, and
* config buildid dir to symfs/.debug
*/
ret = asprintf(&bf, "%s/%s", dir, ".debug");
if (ret < 0)
return -ENOMEM;
set_buildid_dir(bf);
free(bf);
return 0;
}

7
tools/perf/util/symbol.h
View File

@ -44,6 +44,9 @@ Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
#define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */
#endif
#define DSO__NAME_KALLSYMS "[kernel.kallsyms]"
#define DSO__NAME_KCORE "[kernel.kcore]"
/** struct symbol - symtab entry
*
* @ignore - resolvable but tools ignore it (e.g. idle routines)
@ -183,6 +186,8 @@ struct branch_info {
struct addr_map_symbol from;
struct addr_map_symbol to;
struct branch_flags flags;
char *srcline_from;
char *srcline_to;
};
struct mem_info {
@ -287,6 +292,8 @@ bool symbol_type__is_a(char symbol_type, enum map_type map_type);
bool symbol__restricted_filename(const char *filename,
const char *restricted_filename);
bool symbol__is_idle(struct symbol *sym);
int symbol__config_symfs(const struct option *opt __maybe_unused,
const char *dir, int unset __maybe_unused);
int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss,
struct symsrc *runtime_ss, symbol_filter_t filter,

1
tools/perf/util/top.h
View File

@ -27,7 +27,6 @@ struct perf_top {
int max_stack;
bool hide_kernel_symbols, hide_user_symbols, zero;
bool use_tui, use_stdio;
bool kptr_restrict_warned;
bool vmlinux_warned;
bool dump_symtab;
struct hist_entry *sym_filter_entry;

3
tools/perf/util/util.c
View File

@ -33,7 +33,8 @@ struct callchain_param callchain_param = {
unsigned int page_size;
int cacheline_size;
unsigned int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
bool test_attr__enabled;

3
tools/perf/util/util.h
View File

@ -261,7 +261,8 @@ void sighandler_dump_stack(int sig);
extern unsigned int page_size;
extern int cacheline_size;
extern unsigned int sysctl_perf_event_max_stack;
extern int sysctl_perf_event_max_stack;
extern int sysctl_perf_event_max_contexts_per_stack;
struct parse_tag {
char tag;