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SubjectRe: [PATCH 2/2 v3] tracing/histogram: Update the documentation for the buckets modifier
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Hi Steve,

On Wed, 2021-07-07 at 17:36 -0400, Steven Rostedt wrote:
> From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
>
> 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.
>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> ---
> Documentation/trace/histogram.rst | 92
> +++++++++++++++++++++++++++++--
> kernel/trace/trace.c | 1 +
> 2 files changed, 87 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/trace/histogram.rst
> b/Documentation/trace/histogram.rst
> index b71e09f745c3..11094ec6e52e 100644
> --- a/Documentation/trace/histogram.rst
> +++ b/Documentation/trace/histogram.rst
> @@ -77,6 +77,7 @@ Documentation written by Tom Zanussi
> .syscall display a syscall id as a system call name
> .execname display a common_pid as a program name
> .log2 display log2 value rather than raw number
> + .buckets=size display grouping of values rather than raw
> number
> .usecs display a common_timestamp in microseconds
> =========== ==========================================
>
> @@ -228,7 +229,7 @@ Extended error information
> that lists the total number of bytes requested for each function
> in
> the kernel that made one or more calls to kmalloc::
>
> - # echo 'hist:key=call_site:val=bytes_req' > \
> + # echo 'hist:key=call_site:val=bytes_req.buckets=32' > \
> /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger

This just seems random, not sure why you changed it, and it doesn't
make sense on a val anyway..

The rest looks good, though, thanks for doing this!

Reviewed-by: Tom Zanussi <zanussi@kernel.org>



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