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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 23:48:05 -0500 |
| commit | ccf47f5cc4cebdba7444cf1c04fc1b02d4b3cd15 (patch) | |
| tree | a27cd0fbb79dcbbc3dea7e041756844dd8a82398 /kernel/trace/trace.c | |
| parent | tracing: Add .graph suffix option to histogram value (diff) | |
| download | linux-ccf47f5cc4cebdba7444cf1c04fc1b02d4b3cd15.tar.gz linux-ccf47f5cc4cebdba7444cf1c04fc1b02d4b3cd15.tar.bz2 linux-ccf47f5cc4cebdba7444cf1c04fc1b02d4b3cd15.zip | |
tracing: Add nohitcount option for suppressing display of raw hitcount
Add 'nohitcount' ('NOHC' for short) option for suppressing display of
the raw hitcount column in the histogram.
Note that you must specify at least one value except raw 'hitcount'
when you specify this nohitcount option.
# cd /sys/kernel/debug/tracing/
# echo hist:keys=pid:vals=runtime.percent,runtime.graph:sort=pid:NOHC > \
events/sched/sched_stat_runtime/trigger
# sleep 10
# cat events/sched/sched_stat_runtime/hist
# event histogram
#
# trigger info: hist:keys=pid:vals=runtime.percent,runtime.graph:sort=pid:size=2048:nohitcount [active]
#
{ pid: 8 } runtime (%): 3.02 runtime: #
{ pid: 14 } runtime (%): 2.25 runtime:
{ pid: 16 } runtime (%): 2.25 runtime:
{ pid: 26 } runtime (%): 0.17 runtime:
{ pid: 61 } runtime (%): 11.52 runtime: ####
{ pid: 67 } runtime (%): 1.56 runtime:
{ pid: 68 } runtime (%): 0.84 runtime:
{ pid: 76 } runtime (%): 0.92 runtime:
{ pid: 117 } runtime (%): 2.50 runtime: #
{ pid: 146 } runtime (%): 49.88 runtime: ####################
{ pid: 157 } runtime (%): 16.63 runtime: ######
{ pid: 158 } runtime (%): 8.38 runtime: ###
Link: https://lore.kernel.org/linux-trace-kernel/166610814787.56030.4980636083486339906.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, 3 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 55aec4616d8b..948f321b9df1 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5678,6 +5678,7 @@ static const char readme_msg[] = "\t [:size=#entries]\n" "\t [:pause][:continue][:clear]\n" "\t [:name=histname1]\n" + "\t [:nohitcount]\n" "\t [:<handler>.<action>]\n" "\t [if <filter>]\n\n" "\t Note, special fields can be used as well:\n" @@ -5734,6 +5735,8 @@ static const char readme_msg[] = "\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" + "\t The 'nohitcount' (or NOHC) parameter will suppress display of\n" + "\t raw hitcount in the histogram.\n\n" "\t The enable_hist and disable_hist triggers can be used to\n" "\t have one event conditionally start and stop another event's\n" "\t already-attached hist trigger. The syntax is analogous to\n" |