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    SubjectRe: [PATCH 0/5] perf kmem: Add more functions and show more statistics
    On Tue, Nov 24, 2009 at 11:07:24AM +0100, Ingo Molnar wrote:
    >
    > * Li Zefan <lizf@cn.fujitsu.com> wrote:
    >
    > > > 3)
    > > >
    > > > it doesnt seem to be working on one of my boxes, which has perf and kmem
    > > > events as well:
    > > >
    > > > aldebaran:~/linux/linux/tools/perf> perf kmem record
    > > > ^C[ perf record: Woken up 1 times to write data ]
    > > > [ perf record: Captured and wrote 0.050 MB perf.data (~2172 samples) ]
    > > >
    > >
    > > Seems no kmem event is recorded. No sure what happened here.
    > >
    > > Might be that the parameters that perf-kmem passes to perf-record
    > > are not properly selected?
    > >
    > > 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've attached the config, in case it matters. It runs latest -tip, with
    > your latest series applied as well.
    >
    > Ingo



    I think this is a problem external to kmem events. It's about
    trace events/perf in general. It looks like we have some losses.
    Steve and Arjan have reported similar things.

    I'll investigate this way.

    Thanks.



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