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

[Li Zefan <lizf@cn.fujitsu.com>]

>> 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.