Re: [GIT PULL 00/15] perf/core improvements and fixes

[Wangnan (F)]

On 2015/9/14 16:41, Ingo Molnar wrote:
> * Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote:
>
> > Em Tue, Sep 08, 2015 at 04:21:47PM +0200, Ingo Molnar escreveu:
> > > * Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote:
> > >
> > > > Em Fri, Sep 04, 2015 at 10:06:28PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > > > Hi Ingo,
> > > > >
> > > > > 	Please consider pulling, this is on top of the previous pull request,
> > > > > perf-core-for-mingo.
> > > > 	Ingo, please do not pull this 'perf-core-for-mingo-2' tag, there were
> > > > some misunderstandings about the acks for "Move sw clock metrics
> > > > printout to stat-shadow" and Jiri and Andi are working that out.
> > > >
> > > > 	I'll remove those patches and get a new perf-core-for-mingo-2
> > > > tag in place, before continuing today's batch, which possibly will be
> > > > available as 'perf-core-for-mingo-3'
> > > >
> > > > 	What is in 'perf-core-for-mingo" should be Ok.
> > > Ok!
> > Thanks! I have already removed that problematic changeset and resigned
> > the 'perf-core-for-mingo-2' tag, same contents modulo that cset.
> Hm, so I pulled it (commit 1765d9b26f84), but with an old perf.data I'm getting
> this crash:
>
> triton:~/tip/tools/perf> perf report
> perf: Segmentation fault
> -------- backtrace --------
> perf[0x52bc0b]
> /lib/x86_64-linux-gnu/libc.so.6(+0x352f0)[0x7f51a583c2f0]
> perf[0x42ce95]
> perf[0x4bc6c3]
> perf[0x4bcfa1]
> perf[0x4bf939]
> perf(perf_session__process_events+0x390)[0x4be430]
> perf(cmd_report+0x1070)[0x42e2e0]
> perf[0x478e03]
> perf(main+0x60a)[0x41f1ba]
> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f51a5827a40]
> perf(_start+0x29)[0x41f2d9]
> [0x0]
>
> I also re-tested qand it still crashes.
>
> Bisected it to:
>
>    e1e499aba570 perf tools: Add processor socket info to hist_entry and addr_location
>
> Running on Ubuntu, 1 socket box, 12 CPUs.

Hi Ingo,

It seems you met a bug we are discussing these days. Please have a look at
the following discussions:

http://lkml.kernel.org/r/1441630315-189525-1-git-send-email-wangnan0@xxxxxxxxxx

http://lkml.kernel.org/r/1441828225-667-1-git-send-email-acme@xxxxxxxxxx

Thank you.

> I went back to perf/core 8f3e5684d3fb and it doesn't crash anymore - so I unpulled
> your tree for now. (Will send you the perf.data privately.)
>
> Thanks,
>
> 	Ingo
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