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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 | a2c54256dec7510477e2b4f4db187e638f7cac37 (patch) | |
| tree | 86214a4787fbf61cbcb34c97adf7a7b30e984f89 /kernel/trace/trace.c | |
| parent | tracing: Add .percent suffix option to histogram values (diff) | |
| download | linux-a2c54256dec7510477e2b4f4db187e638f7cac37.tar.gz linux-a2c54256dec7510477e2b4f4db187e638f7cac37.tar.bz2 linux-a2c54256dec7510477e2b4f4db187e638f7cac37.zip | |
tracing: Add .graph suffix option to histogram value
Add the .graph suffix which shows the bar graph of the histogram value.
For example, the below example shows that the bar graph
of the histogram of the runtime for each tasks.
------
# cd /sys/kernel/debug/tracing/
# echo hist:keys=pid:vals=runtime.graph: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.graph:sort=pid:size=2048 [active]
#
{ pid: 14 } hitcount: 2 runtime:
{ pid: 16 } hitcount: 8 runtime:
{ pid: 26 } hitcount: 1 runtime:
{ pid: 57 } hitcount: 3 runtime:
{ pid: 61 } hitcount: 20 runtime: ###
{ pid: 66 } hitcount: 2 runtime:
{ pid: 70 } hitcount: 3 runtime:
{ pid: 72 } hitcount: 2 runtime:
{ pid: 145 } hitcount: 14 runtime: ####################
{ pid: 152 } hitcount: 5 runtime: #######
{ pid: 153 } hitcount: 2 runtime: ####
Totals:
Hits: 62
Entries: 11
Dropped: 0
-------
Link: https://lore.kernel.org/linux-trace-kernel/166610813953.56030.10944148382315789485.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 08e9568849b1..55aec4616d8b 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5725,7 +5725,8 @@ static const char readme_msg[] = "\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" - "\t .percent display a number of percentage value\n\n" + "\t .percent display a number of percentage value\n" + "\t .graph display a bar-graph of a 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" |