mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 09:02:00 +00:00
21b8732eb4
After update of kernel, the perf tool doesn't run anymore on my 32MB RAM
powerpc board, but still runs on a 128MB RAM board:
~# strace perf
execve("/usr/sbin/perf", ["perf"], [/* 12 vars */]) = -1 ENOMEM (Cannot allocate memory)
--- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} ---
+++ killed by SIGSEGV +++
Segmentation fault
objdump -x shows that .bss section has a huge size of 24Mbytes:
27 .bss 016baca8 101cebb8 101cebb8 001cd988 2**3
With especially the following objects having quite big size:
10205f80 l O .bss 00140000 runtime_cycles_stats
10345f80 l O .bss 00140000 runtime_stalled_cycles_front_stats
10485f80 l O .bss 00140000 runtime_stalled_cycles_back_stats
105c5f80 l O .bss 00140000 runtime_branches_stats
10705f80 l O .bss 00140000 runtime_cacherefs_stats
10845f80 l O .bss 00140000 runtime_l1_dcache_stats
10985f80 l O .bss 00140000 runtime_l1_icache_stats
10ac5f80 l O .bss 00140000 runtime_ll_cache_stats
10c05f80 l O .bss 00140000 runtime_itlb_cache_stats
10d45f80 l O .bss 00140000 runtime_dtlb_cache_stats
10e85f80 l O .bss 00140000 runtime_cycles_in_tx_stats
10fc5f80 l O .bss 00140000 runtime_transaction_stats
11105f80 l O .bss 00140000 runtime_elision_stats
11245f80 l O .bss 00140000 runtime_topdown_total_slots
11385f80 l O .bss 00140000 runtime_topdown_slots_retired
114c5f80 l O .bss 00140000 runtime_topdown_slots_issued
11605f80 l O .bss 00140000 runtime_topdown_fetch_bubbles
11745f80 l O .bss 00140000 runtime_topdown_recovery_bubbles
This is due to commit 4d255766d2 ("perf: Bump max number of cpus
to 1024"), because many tables are sized with MAX_NR_CPUS
This patch gives the opportunity to redefine MAX_NR_CPUS via
$ make EXTRA_CFLAGS=-DMAX_NR_CPUS=1
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/20170922112043.8349468C57@po15668-vm-win7.idsi0.si.c-s.fr
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _PERF_PERF_H
|
|
#define _PERF_PERF_H
|
|
|
|
#include <time.h>
|
|
#include <stdbool.h>
|
|
#include <linux/types.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/perf_event.h>
|
|
|
|
extern bool test_attr__enabled;
|
|
void test_attr__ready(void);
|
|
void test_attr__init(void);
|
|
void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
|
|
int fd, int group_fd, unsigned long flags);
|
|
|
|
#define HAVE_ATTR_TEST
|
|
#include "perf-sys.h"
|
|
|
|
static inline unsigned long long rdclock(void)
|
|
{
|
|
struct timespec ts;
|
|
|
|
clock_gettime(CLOCK_MONOTONIC, &ts);
|
|
return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
|
|
}
|
|
|
|
#ifndef MAX_NR_CPUS
|
|
#define MAX_NR_CPUS 1024
|
|
#endif
|
|
|
|
extern const char *input_name;
|
|
extern bool perf_host, perf_guest;
|
|
extern const char perf_version_string[];
|
|
|
|
void pthread__unblock_sigwinch(void);
|
|
|
|
#include "util/target.h"
|
|
|
|
struct record_opts {
|
|
struct target target;
|
|
bool group;
|
|
bool inherit_stat;
|
|
bool no_buffering;
|
|
bool no_inherit;
|
|
bool no_inherit_set;
|
|
bool no_samples;
|
|
bool raw_samples;
|
|
bool sample_address;
|
|
bool sample_phys_addr;
|
|
bool sample_weight;
|
|
bool sample_time;
|
|
bool sample_time_set;
|
|
bool sample_cpu;
|
|
bool period;
|
|
bool period_set;
|
|
bool running_time;
|
|
bool full_auxtrace;
|
|
bool auxtrace_snapshot_mode;
|
|
bool record_namespaces;
|
|
bool record_switch_events;
|
|
bool all_kernel;
|
|
bool all_user;
|
|
bool tail_synthesize;
|
|
bool overwrite;
|
|
bool ignore_missing_thread;
|
|
bool strict_freq;
|
|
bool sample_id;
|
|
unsigned int freq;
|
|
unsigned int mmap_pages;
|
|
unsigned int auxtrace_mmap_pages;
|
|
unsigned int user_freq;
|
|
u64 branch_stack;
|
|
u64 sample_intr_regs;
|
|
u64 sample_user_regs;
|
|
u64 default_interval;
|
|
u64 user_interval;
|
|
size_t auxtrace_snapshot_size;
|
|
const char *auxtrace_snapshot_opts;
|
|
bool sample_transaction;
|
|
unsigned initial_delay;
|
|
bool use_clockid;
|
|
clockid_t clockid;
|
|
unsigned int proc_map_timeout;
|
|
};
|
|
|
|
struct option;
|
|
extern const char * const *record_usage;
|
|
extern struct option *record_options;
|
|
extern int version_verbose;
|
|
|
|
int record__parse_freq(const struct option *opt, const char *str, int unset);
|
|
#endif
|