path: root/kernel
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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2021-07-07 17:36:25 -0400
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-08-16 11:37:20 -0400
commit370364351926e4fcc7c1a486901bfaae0172b7d9 (patch)
tree3c94dfea44b841847ddff7e27d8f505b71997398 /kernel
parentde9a48a360b70d5318061cf1237431d1869555e4 (diff)
tracing/histogram: Update the documentation for the buckets modifier
Update both the tracefs README file as well as the histogram.rst to include an explanation of what the buckets modifier is and how to use it. Include an example with the wakeup_latency example for both log2 and the buckets modifiers as there was no existing log2 example. Link: https://lkml.kernel.org/r/20210707213922.167218794@goodmis.org Acked-by: Namhyung Kim <namhyung@kernel.org> Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a1adb29ef5c1..be0169594de5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5654,6 +5654,7 @@ static const char readme_msg[] =
"\t .execname display a common_pid as a program name\n"
"\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 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"

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