Re: [PATCH 0/5] perf kmem: Add more functions and show more statistics

Li Zefan
2009-11-24T11:05:04Z

>> Do perf-sched and perf-timechart work on this box?
>
> yeah:
>
> aldebaran:~> perf sched record sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.017 MB perf.data (~758 samples) ]
> aldebaran:~> perf trace | tail -5
> distccd-20944 [010] 1792.787376: sched_stat_runtime: comm=distccd pid=20944 runtime=11196 [ns] vruntime=696395420043 [ns]
> init-0 [009] 1792.914837: sched_stat_wait: comm=x86_64-linux-gc pid=881 delay=10686 [ns]
> init-0 [009] 1792.915082: sched_stat_sleep: comm=events/9 pid=44 delay=2183651362 [ns]
> as-889 [013] 1793.008008: sched_stat_runtime: comm=as pid=889 runtime=156807 [ns] vruntime=1553569219042 [ns]
> init-0 [004] 1793.154400: sched_stat_wait: comm=events/4 pid=39 delay=12155 [ns]
>
> aldebaran:~> perf kmem record sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.078 MB perf.data (~3398 samples) ]
> aldebaran:~> perf trace | tail -5
> aldebaran:~>
>
> the perf.data has mmap and exit events - but no kmem events.
>

I was using yesterday's -tip tree, and I just updated to the latest -tip,
and I found perf tools are not working:

# ./perf kmem record sleep 3
...
# ./perf trace
perf-1805 [001] 66.239160: kmem_cache_free: ...
perf-1806 [000] 66.403561: kmem_cache_alloc: ...
swapper-0 [000] 66.420099: kmem_cache_free: ...
# ./perf kmem record sleep 3
...
# ./perf trace
# ./perf sched record sleep 3
.../
# ./perf trace
perf-1825 [000] 103.543014: sched_stat_runtime: ...
# ./perf sched record sleep 3
...
# ./perf trace
#

So I think some new updates on kernel perf_event break.