Messages in this thread | | | Date | Mon, 17 Aug 2015 16:58:23 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH V8 08/25] perf tools: Add Intel BTS support |
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Em Mon, Aug 17, 2015 at 10:09:26PM +0300, Adrian Hunter escreveu: > 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?
http://vger.kernel.org/~acme/perf/perf.data.intel_bts-4.2.0-rc5+.xz
It works if I use a tip/master kernel:
[root@perf4 ~]# uname -r 4.2.0-rc7+ [root@perf4 ~]# uname -r 4.2.0-rc7+ [root@perf4 ~]# perf record --per-thread -e intel_bts// usleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 1.785 MB perf.data ] [root@perf4 ~]# dmesg | grep Performance [ 0.188477] Performance Events: PEBS fmt2+, 16-deep LBR, Broadwell events, full-width counters, Intel PMU driver. [root@perf4 ~]# perf report --stdio | grep -v ^# | head -10
10.81% usleep libc-2.17.so [.] _dl_addr 6.56% usleep [kernel.kallsyms] [.] unmap_single_vma 3.33% usleep ld-2.17.so [.] strcmp 2.53% usleep [kernel.kallsyms] [.] mem_cgroup_begin_page_stat 2.49% usleep ld-2.17.so [.] _dl_lookup_symbol_x 2.39% usleep ld-2.17.so [.] _dl_relocate_object [root@perf4 ~]#
Probably some fix for the kernel driver is missing?
- Arnaldo
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