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| author | Masami Hiramatsu (Google) <mhiramat@kernel.org> | 2022-10-20 00:31:55 +0900 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-12-09 23:48:04 -0500 |
| commit | abaa5258ce5e5887a9de049f50a85dc023391a1c (patch) | |
| tree | 4f03873d457df15655ce28f222fa06c15204aa3b /kernel/trace/trace.c | |
| parent | 5f2e094ed2592abb3d1f49e263957188e121c2ac (diff) | |
| download | linux-abaa5258ce5e5887a9de049f50a85dc023391a1c.tar.gz linux-abaa5258ce5e5887a9de049f50a85dc023391a1c.tar.bz2 linux-abaa5258ce5e5887a9de049f50a85dc023391a1c.zip | |
tracing: Add .percent suffix option to histogram values
Add .percent suffix option to show the histogram values in percentage.
This feature is useful when we need yo undersntand the overall trend
for the histograms of large values.
E.g. this shows the runtime percentage for each tasks.
------
# cd /sys/kernel/debug/tracing/
# echo hist:keys=pid:vals=hitcount,runtime.percent:sort=pid > \
events/sched/sched_stat_runtime/trigger
# sleep 10
# cat events/sched/sched_stat_runtime/hist
# event histogram
#
# trigger info: hist:keys=pid:vals=hitcount,runtime.percent:sort=pid:size=2048 [active]
#
{ pid: 8 } hitcount: 7 runtime (%): 4.14
{ pid: 14 } hitcount: 5 runtime (%): 3.69
{ pid: 16 } hitcount: 11 runtime (%): 3.41
{ pid: 61 } hitcount: 41 runtime (%): 19.75
{ pid: 65 } hitcount: 4 runtime (%): 1.48
{ pid: 70 } hitcount: 6 runtime (%): 3.60
{ pid: 72 } hitcount: 2 runtime (%): 1.10
{ pid: 144 } hitcount: 10 runtime (%): 32.01
{ pid: 151 } hitcount: 8 runtime (%): 22.66
{ pid: 152 } hitcount: 2 runtime (%): 8.10
Totals:
Hits: 96
Entries: 10
Dropped: 0
-----
Link: https://lore.kernel.org/linux-trace-kernel/166610813077.56030.4238090506973562347.stgit@devnote2
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Tested-by: Tom Zanussi <zanussi@kernel.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 93a75a97118f..08e9568849b1 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5724,7 +5724,8 @@ static const char readme_msg[] = "\t .syscall display a syscall id as a syscall name\n" "\t .log2 display log2 value rather than raw number\n" "\t .buckets=size display values in groups of size rather than raw number\n" - "\t .usecs display a common_timestamp in microseconds\n\n" + "\t .usecs display a common_timestamp in microseconds\n" + "\t .percent display a number of percentage value\n\n" "\t The 'pause' parameter can be used to pause an existing hist\n" "\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" |