linux-kernel - Re: [PATCH V8 08/25] perf tools: Add Intel BTS support

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Date:	Mon, 17 Aug 2015 22:09:26 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH V8 08/25] perf tools: Add Intel BTS support

On 17/08/2015 8:58 p.m., Arnaldo Carvalho de Melo wrote:
> Em Mon, Aug 17, 2015 at 08:43:09PM +0300, Adrian Hunter escreveu:
>> On 17/08/2015 6:52 p.m., Arnaldo Carvalho de Melo wrote:
>>>       1.92%  usleep   [unknown]         [.] 0x00007fa0ff695086
>>>       1.60%  usleep   [unknown]         [.] 0xffffffff811c91d0
>>>       1.48%  usleep   [unknown]         [.] 0x00007fa0ffb3030d
>>>       1.24%  usleep   [unknown]         [.] 0x00007fa0ff6950c7
>
>> It is very weird that it doesn't know the dso.
>
>> I presume there is nothing unusual about the environment e.g. in a chroot or anything
>
>> What if you try a different event e.g. perf record --per-thread -e cycles sleep 1
>
> [root@zoo ~]# perf record --per-thread -e cycles sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.014 MB perf.data (9 samples) ]
> [root@zoo ~]# perf report | grep -v ^# | head -5
>      42.57%  sleep    libc-2.20.so      [.] malloc_hook_ini
>      41.81%  sleep    [kernel.vmlinux]  [k] filemap_fault
>      14.35%  sleep    [kernel.vmlinux]  [k] flush_tlb_mm_range
>       1.18%  sleep    [kernel.vmlinux]  [k] strlcpy
>       0.09%  sleep    [kernel.vmlinux]  [k] native_write_msr_safe
> [root@zoo ~]#
>
> [root@zoo ~]# perf report --dsos libc-2.20.so | grep -v '^[#]'
>      42.57%  sleep    [.] malloc_hook_ini
>
>
> [root@zoo ~]#
>
> [root@zoo ~]# perf record --per-thread -e intel_bts// usleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 1.825 MB perf.data ]
> [root@zoo ~]# perf report | grep -v ^# | head -5
> Warning:
> 79074 instruction trace errors
>
>
>
>
>       2.80%  usleep   [unknown]         [.] 0x00007f48888aa061
> [root@zoo ~]#

Running out of ideas.  Can you somehow share or send me the offending perf.data file?
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