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tracing: add format files for ftrace default entries
Impact: allow user apps to read binary format of basic ftrace entries
Currently, only defined raw events export their formats so a binary
reader can parse them. There's no reason that the default ftrace entries
can't export their formats.
This patch adds a subsystem called "ftrace" in the events directory
that includes the ftrace entries for basic ftrace recorded items.
These only have three files in the events directory:
type : printf
available_types : printf
format : format for the event entry
For example:
# cat /debug/tracing/events/ftrace/wakeup/format
name: wakeup
ID: 3
format:
field:unsigned char type; offset:0; size:1;
field:unsigned char flags; offset:1; size:1;
field:unsigned char preempt_count; offset:2; size:1;
field:int pid; offset:4; size:4;
field:int tgid; offset:8; size:4;
field:unsigned int prev_pid; offset:12; size:4;
field:unsigned char prev_prio; offset:16; size:1;
field:unsigned char prev_state; offset:17; size:1;
field:unsigned int next_pid; offset:20; size:4;
field:unsigned char next_prio; offset:24; size:1;
field:unsigned char next_state; offset:25; size:1;
field:unsigned int next_cpu; offset:28; size:4;
print fmt: "%u:%u:%u ==+ %u:%u:%u [%03u]"
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt
parent
33b0c229e3
commit
770cb24345
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@ -41,5 +41,6 @@ obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
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obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
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obj-$(CONFIG_EVENT_TRACER) += trace_events.o
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obj-$(CONFIG_EVENT_TRACER) += events.o
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obj-$(CONFIG_EVENT_TRACER) += trace_export.o
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libftrace-y := ftrace.o
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165
kernel/trace/trace_event_types.h
Normal file
165
kernel/trace/trace_event_types.h
Normal file
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@ -0,0 +1,165 @@
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM ftrace
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/*
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* We cheat and use the proto type field as the ID
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* and args as the entry type (minus 'struct')
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*/
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TRACE_EVENT_FORMAT(function, TRACE_FN, ftrace_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(unsigned long, ip, ip)
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TRACE_FIELD(unsigned long, parent_ip, parent_ip)
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),
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TPRAWFMT(" %lx <-- %lx")
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);
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TRACE_EVENT_FORMAT(funcgraph_entry, TRACE_GRAPH_ENT,
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ftrace_graph_ent_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(unsigned long, graph_ent.func, func)
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TRACE_FIELD(int, graph_ent.depth, depth)
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),
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TPRAWFMT("--> %lx (%d)")
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);
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TRACE_EVENT_FORMAT(funcgraph_exit, TRACE_GRAPH_RET,
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ftrace_graph_ret_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(unsigned long, ret.func, func)
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TRACE_FIELD(int, ret.depth, depth)
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),
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TPRAWFMT("<-- %lx (%d)")
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);
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TRACE_EVENT_FORMAT(wakeup, TRACE_WAKE, ctx_switch_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(unsigned int, prev_pid, prev_pid)
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TRACE_FIELD(unsigned char, prev_prio, prev_prio)
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TRACE_FIELD(unsigned char, prev_state, prev_state)
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TRACE_FIELD(unsigned int, next_pid, next_pid)
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TRACE_FIELD(unsigned char, next_prio, next_prio)
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TRACE_FIELD(unsigned char, next_state, next_state)
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TRACE_FIELD(unsigned int, next_cpu, next_cpu)
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),
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TPRAWFMT("%u:%u:%u ==+ %u:%u:%u [%03u]")
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);
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TRACE_EVENT_FORMAT(context_switch, TRACE_CTX, ctx_switch_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(unsigned int, prev_pid, prev_pid)
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TRACE_FIELD(unsigned char, prev_prio, prev_prio)
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TRACE_FIELD(unsigned char, prev_state, prev_state)
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TRACE_FIELD(unsigned int, next_pid, next_pid)
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TRACE_FIELD(unsigned char, next_prio, next_prio)
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TRACE_FIELD(unsigned char, next_state, next_state)
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TRACE_FIELD(unsigned int, next_cpu, next_cpu)
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),
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TPRAWFMT("%u:%u:%u ==+ %u:%u:%u [%03u]")
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);
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TRACE_EVENT_FORMAT(special, TRACE_SPECIAL, special_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(unsigned long, arg1, arg1)
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TRACE_FIELD(unsigned long, arg2, arg2)
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TRACE_FIELD(unsigned long, arg3, arg3)
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),
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TPRAWFMT("(%08lx) (%08lx) (%08lx)")
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);
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/*
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* Stack-trace entry:
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*/
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/* #define FTRACE_STACK_ENTRIES 8 */
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TRACE_EVENT_FORMAT(kernel_stack, TRACE_STACK, stack_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(unsigned long, caller[0], stack0)
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TRACE_FIELD(unsigned long, caller[1], stack1)
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TRACE_FIELD(unsigned long, caller[2], stack2)
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TRACE_FIELD(unsigned long, caller[3], stack3)
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TRACE_FIELD(unsigned long, caller[4], stack4)
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TRACE_FIELD(unsigned long, caller[5], stack5)
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TRACE_FIELD(unsigned long, caller[6], stack6)
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TRACE_FIELD(unsigned long, caller[7], stack7)
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),
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TPRAWFMT("\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n"
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"\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n")
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);
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TRACE_EVENT_FORMAT(user_stack, TRACE_USER_STACK, userstack_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(unsigned long, caller[0], stack0)
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TRACE_FIELD(unsigned long, caller[1], stack1)
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TRACE_FIELD(unsigned long, caller[2], stack2)
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TRACE_FIELD(unsigned long, caller[3], stack3)
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TRACE_FIELD(unsigned long, caller[4], stack4)
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TRACE_FIELD(unsigned long, caller[5], stack5)
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TRACE_FIELD(unsigned long, caller[6], stack6)
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TRACE_FIELD(unsigned long, caller[7], stack7)
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),
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TPRAWFMT("\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n"
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"\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n")
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);
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TRACE_EVENT_FORMAT(print, TRACE_PRINT, print_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(unsigned long, ip, ip)
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TRACE_FIELD(unsigned int, depth, depth)
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TRACE_FIELD_ZERO_CHAR(buf)
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),
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TPRAWFMT("%08lx (%d) %s")
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);
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TRACE_EVENT_FORMAT(branch, TRACE_BRANCH, trace_branch, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(unsigned int, line, line)
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TRACE_FIELD_SPECIAL(char func[TRACE_FUNC_SIZE+1], func, func)
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TRACE_FIELD_SPECIAL(char file[TRACE_FUNC_SIZE+1], file, file)
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TRACE_FIELD(char, correct, correct)
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),
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TPRAWFMT("%u:%s:%s (%u)")
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);
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TRACE_EVENT_FORMAT(hw_branch, TRACE_HW_BRANCHES, hw_branch_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(u64, from, from)
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TRACE_FIELD(u64, to, to)
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),
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TPRAWFMT("from: %llx to: %llx")
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);
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TRACE_EVENT_FORMAT(power, TRACE_POWER, trace_power, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(ktime_t, state_data.stamp, stamp)
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TRACE_FIELD(ktime_t, state_data.end, end)
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TRACE_FIELD(int, state_data.type, type)
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TRACE_FIELD(int, state_data.state, state)
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),
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TPRAWFMT("%llx->%llx type:%u state:%u")
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);
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TRACE_EVENT_FORMAT(kmem_alloc, TRACE_KMEM_ALLOC, kmemtrace_alloc_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(enum kmemtrace_type_id, type_id, type_id)
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TRACE_FIELD(unsigned long, call_site, call_site)
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TRACE_FIELD(const void *, ptr, ptr)
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TRACE_FIELD(size_t, bytes_req, bytes_req)
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TRACE_FIELD(size_t, bytes_alloc, bytes_alloc)
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TRACE_FIELD(gfp_t, gfp_flags, gfp_flags)
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TRACE_FIELD(int, node, node)
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),
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TPRAWFMT("type:%u call_site:%lx ptr:%p req:%lu alloc:%lu"
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" flags:%x node:%d")
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);
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TRACE_EVENT_FORMAT(kmem_free, TRACE_KMEM_FREE, kmemtrace_free_entry, ignore,
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TRACE_STRUCT(
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TRACE_FIELD(enum kmemtrace_type_id, type_id, type_id)
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TRACE_FIELD(unsigned long, call_site, call_site)
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TRACE_FIELD(const void *, ptr, ptr)
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),
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TPRAWFMT("type:%u call_site:%lx ptr:%p")
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);
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#undef TRACE_SYSTEM
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@ -656,11 +656,13 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
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return -1;
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}
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entry = debugfs_create_file("enable", 0644, call->dir, call,
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&ftrace_enable_fops);
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if (!entry)
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pr_warning("Could not create debugfs "
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"'%s/enable' entry\n", call->name);
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if (call->regfunc) {
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entry = debugfs_create_file("enable", 0644, call->dir, call,
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&ftrace_enable_fops);
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if (!entry)
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pr_warning("Could not create debugfs "
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"'%s/enable' entry\n", call->name);
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}
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/* Only let type be writable, if we can change it */
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entry = debugfs_create_file("type",
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81
kernel/trace/trace_export.c
Normal file
81
kernel/trace/trace_export.c
Normal file
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@ -0,0 +1,81 @@
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/*
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* trace_export.c - export basic ftrace utilities to user space
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*
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* Copyright (C) 2009 Steven Rostedt <srostedt@redhat.com>
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*/
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#include <linux/stringify.h>
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#include <linux/kallsyms.h>
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <linux/ftrace.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include "trace_output.h"
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#include "trace_format.h"
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#undef TRACE_FIELD_ZERO_CHAR
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#define TRACE_FIELD_ZERO_CHAR(item) \
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ret = trace_seq_printf(s, "\tfield: char " #item ";\t" \
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"offset:%lu;\tsize:0;\n", \
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offsetof(typeof(field), item)); \
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if (!ret) \
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return 0;
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#undef TPRAWFMT
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#define TPRAWFMT(args...) args
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#undef TRACE_EVENT_FORMAT
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#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
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static int \
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ftrace_format_##call(struct trace_seq *s) \
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{ \
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struct args field; \
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int ret; \
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\
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tstruct; \
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\
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trace_seq_printf(s, "\nprint fmt: \"%s\"\n", tpfmt); \
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\
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return ret; \
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}
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#include "trace_event_types.h"
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#undef TRACE_ZERO_CHAR
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#define TRACE_ZERO_CHAR(arg)
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign)\
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entry->item = assign;
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#undef TRACE_FIELD
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#define TRACE_FIELD(type, item, assign)\
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entry->item = assign;
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#undef TPCMD
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#define TPCMD(cmd...) cmd
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#undef TRACE_ENTRY
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#define TRACE_ENTRY entry
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#undef TRACE_FIELD_SPECIAL
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#define TRACE_FIELD_SPECIAL(type_item, item, cmd) \
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cmd;
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#undef TRACE_EVENT_FORMAT
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#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
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\
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static struct ftrace_event_call __used \
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__attribute__((__aligned__(4))) \
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__attribute__((section("_ftrace_events"))) event_##call = { \
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.name = #call, \
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.id = proto, \
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.system = __stringify(TRACE_SYSTEM), \
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.show_format = ftrace_format_##call, \
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}
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#include "trace_event_types.h"
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@ -40,7 +40,7 @@
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#undef TRACE_EVENT_FORMAT
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#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
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int \
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static int \
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ftrace_format_##call(struct trace_seq *s) \
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{ \
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struct ftrace_raw_##call field; \
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