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author | Steven Rostedt <srostedt@redhat.com> | 2010-11-12 22:32:11 -0500 |
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committer | Steven Rostedt <rostedt@goodmis.org> | 2010-11-19 10:18:47 -0500 |
commit | 042957801626465492b9428860de39a3cb2a8219 (patch) | |
tree | b0997862babd5e474c500b1b4c522f3a03842106 /kernel/trace/trace_events.c | |
parent | 45677454dd6d128608117abe7dcd2bdfdd7cdf72 (diff) | |
download | kernel_samsung_tuna-042957801626465492b9428860de39a3cb2a8219.zip kernel_samsung_tuna-042957801626465492b9428860de39a3cb2a8219.tar.gz kernel_samsung_tuna-042957801626465492b9428860de39a3cb2a8219.tar.bz2 |
tracing/events: Show real number in array fields
Currently we have in something like the sched_switch event:
field:char prev_comm[TASK_COMM_LEN]; offset:12; size:16; signed:1;
When a userspace tool such as perf tries to parse this, the
TASK_COMM_LEN is meaningless. This is done because the TRACE_EVENT() macro
simply uses a #len to show the string of the length. When the length is
an enum, we get a string that means nothing for tools.
By adding a static buffer and a mutex to protect it, we can store the
string into that buffer with snprintf and show the actual number.
Now we get:
field:char prev_comm[16]; offset:12; size:16; signed:1;
Something much more useful.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_events.c')
-rw-r--r-- | kernel/trace/trace_events.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 0725eea..35fde09 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -27,6 +27,12 @@ DEFINE_MUTEX(event_mutex); +DEFINE_MUTEX(event_storage_mutex); +EXPORT_SYMBOL_GPL(event_storage_mutex); + +char event_storage[EVENT_STORAGE_SIZE]; +EXPORT_SYMBOL_GPL(event_storage); + LIST_HEAD(ftrace_events); LIST_HEAD(ftrace_common_fields); |