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| author | Tom Zanussi <tom.zanussi@linux.intel.com> | 2016-03-03 21:54:47 +0300 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2016-04-19 19:17:35 +0300 |
| commit | e86ae9baacfa9efe957df4fc037f079772636d76 (patch) | |
| tree | e07aea609d84ed0aa32db8307b2d5c5cdc453f11 /kernel/trace/trace.c | |
| parent | 83e99914c9e2677d8a80f2a23eca0d215d5bfb0f (diff) | |
| download | linux-e86ae9baacfa9efe957df4fc037f079772636d76.tar.xz | |
tracing: Add hist trigger support for clearing a trace
Allow users to append 'clear' to an existing trigger in order to have
the hash table cleared.
This expands the hist trigger syntax from this:
# echo hist:keys=xxx:vals=yyy:sort=zzz.descending:pause/cont \
[ if filter] >> event/trigger
to this:
# echo hist:keys=xxx:vals=yyy:sort=zzz.descending:pause/cont/clear \
[ if filter] >> event/trigger
Link: http://lkml.kernel.org/r/ae15dd0d9b2f7af07a37c1ff682063e2dbcdf160.1457029949.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 7d5c63dd410a..4097cd3763f7 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -3837,7 +3837,7 @@ static const char readme_msg[] = "\t [:values=<field1[,field2,...]>]\n" "\t [:sort=<field1[,field2,...]>]\n" "\t [:size=#entries]\n" - "\t [:pause][:continue]\n" + "\t [:pause][:continue][:clear]\n" "\t [if <filter>]\n\n" "\t When a matching event is hit, an entry is added to a hash\n" "\t table using the key(s) and value(s) named, and the value of a\n" @@ -3857,6 +3857,9 @@ static const char readme_msg[] = "\t trigger or to start a hist trigger but not log any events\n" "\t until told to do so. 'continue' can be used to start or\n" "\t restart a paused hist trigger.\n\n" + "\t The 'clear' parameter will clear the contents of a running\n" + "\t hist trigger and leave its current paused/active state\n" + "\t unchanged.\n\n" #endif ; |