tracing: Add fields format definition for syscall events
authorFrederic Weisbecker <fweisbec@gmail.com>
Tue, 11 Aug 2009 17:03:54 +0000 (19:03 +0200)
committerFrederic Weisbecker <fweisbec@gmail.com>
Tue, 11 Aug 2009 18:35:30 +0000 (20:35 +0200)
commitdc4ddb4c0b7348f1c9759ae8a9e7d734dc1cda82
tree00c0df5d9b7809a0c0cf89713c55c7e04ce6c248
parente8f9f4d79a677f55c8ec3acbe87b33a87e2df0de
tracing: Add fields format definition for syscall events

Define the format of the syscall trace fields to parse the binary
values from a raw trace using the syscall events "format" file.

This is defined dynamically using the syscalls metadata.
It prepares the export of syscall event raw records to perf
counters.

Example:

$ cat /debug/tracing/events/syscalls/sys_enter_sched_getparam/format
name: sys_enter_sched_getparam
ID: 39
format:
field:unsigned short common_type; offset:0; size:2;
field:unsigned char common_flags; offset:2; size:1;
field:unsigned char common_preempt_count; offset:3; size:1;
field:int common_pid; offset:4; size:4;
field:int common_tgid; offset:8; size:4;

field:pid_t pid; offset:12; size:8;
field:struct sched_param * param; offset:20; size:8;

print fmt: "pid: 0x%08lx, param: 0x%08lx", ((unsigned long)(REC->pid)), ((unsigned long)(REC->param))

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
include/linux/syscalls.h
include/trace/syscall.h
kernel/trace/trace_syscalls.c