lkml.org 
[lkml]   [2022]   [Apr]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCHSET v4 next 0/3] perf stat: add user_time and system_time tool events
Em Wed, Apr 20, 2022 at 12:23:51PM +0200, Florian Fischer escreveu:
> This patch series adds new internal events to perf stat exposing the times spend
> in user and kernel mode in nanoseconds reported by rusage.
>
> During some benchmarking using perf it bothered me that I could not easily
> retrieve those times from perf stat when using the machine readable output.
>
> But perf definitely knows about those values because in the human readable output
> they are present.
>
> Therefore I exposed the times reported by rusage via the new tool events:
> user_time and system_time.
>
> This allows to retrieved them in machine-readable output:
>
> $ ./perf stat -x, -e duration_time,user_time,system_time,cache-misses -- grep -q -r duration_time tools/perf
> 72134524,ns,duration_time:u,72134524,100.00,,
> 65225000,ns,user_time:u,65225000,100.00,,
> 6865000,ns,ssystem_time:u,6865000,100.00,,
> 38705,,cache-misses:u,71189328,100.00,,
>
> The changes are mostly inspired by the code for the only other available
> tool event: 'duration_time'.
>
> For now the new user_time and system_time events are not usable with metrics
> (as far as I understand).
>
> The patch applies cleanly on linux-next/next-20220420.

I tested and applied the first two patches, please take a look at that
"OR" problem with patch 3.

- Arnaldo

> [PATCH v4 1/3] perf stat: introduce stats for the user and system
> [PATCH v4 2/3] perf stat: add user_time and system_time events
> [PATCH v4 3/3] perf list: print all available tool events
>
> [v2]: Split up the changes into separate commits.
>
> [v3]: * Use nanoseconds as suggested by Xing Zhengjun.
> * Squash [PATCH v2 2/4] and [PATCH v2 4/4], because it only adds the unit string.
>
> [v4]: * Simplify event names to only user_time and system_time as suggested by Ian Rogers.
>
> Florian Fischer

\
 
 \ /
  Last update: 2022-04-20 18:47    [W:1.589 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site