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

[Arnaldo Carvalho de Melo <acme@kernel.org>]

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 ~]#

- Arnaldo