Re: Intel PT not work on 4.5.0-rc

From: Arnaldo Carvalho de Melo
Date: Tue Mar 01 2016 - 13:25:16 EST


Em Tue, Mar 01, 2016 at 03:20:35PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Mar 01, 2016 at 12:59:21PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Anyway, 'strace' shows the 4 pairs of mmaps, but it still doesn't work, rebooting:
>
> After I reboot, all works:
>
> [root@jouet ~]# perf record -e intel_pt//u -a sleep 0.001
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 1.119 MB perf.data ]
> [root@jouet ~]# perf script | head -10
> perf 3797 [002] 8136.590828: 1 branches:u: 0 [unknown] ([unknown]) => 7fcb3f240707 __GI___ioctl (/usr/lib64/libc-2.22.so)
> perf 3797 [002] 8136.590828: 1 branches:u: 7fcb3f24070f __GI___ioctl (/usr/lib64/libc-2.22.so) => 497e56 perf_evsel__enable (/home/acme/bin/perf)
> perf 3797 [002] 8136.590828: 1 branches:u: 497e58 perf_evsel__enable (/home/acme/bin/perf) => 497e20 perf_evsel__enable (/home/acme/bin/perf)
> perf 3797 [002] 8136.590828: 1 branches:u: 497e27 perf_evsel__enable (/home/acme/bin/perf) => 497e80 perf_evsel__enable (/home/acme/bin/perf)
> perf 3797 [002] 8136.590828: 1 branches:u: 497e87 perf_evsel__enable (/home/acme/bin/perf) => 497e14 perf_evsel__enable (/home/acme/bin/perf)
> perf 3797 [002] 8136.590828: 1 branches:u: 497e1b perf_evsel__enable (/home/acme/bin/perf) => 497e29 perf_evsel__enable (/home/acme/bin/perf)
> perf 3797 [002] 8136.590828: 1 branches:u: 497e51 perf_evsel__enable (/home/acme/bin/perf) => 421d00 ioctl@plt (/home/acme/bin/perf)
> perf 3797 [002] 8136.590828: 1 branches:u: 421d00 ioctl@plt (/home/acme/bin/perf) => 7fcb3f240700 __GI___ioctl (/usr/lib64/libc-2.22.so)
> perf 3797 [002] 8136.590828: 1 branches:u: 7fcb3f240705 __GI___ioctl (/usr/lib64/libc-2.22.so) => 0 [unknown] ([unknown])
> perf 3797 [002] 8136.590834: 1 branches:u: 0 [unknown] ([unknown]) => 7fcb3f240707 __GI___ioctl (/usr/lib64/libc-2.22.so)
> [root@jouet ~]#
> [root@jouet ~]# perf report -D | tail -20
> . 0020: 00 00 00 00 00 00 00 00 07 14 b9 72 66 07 00 00 ...........rf...
> . 0030: 03 00 00 00 00 00 00 00 1e 00 00 00 00 00 00 00 ................
>
> 3 8136592790535 0x11e688 [0x40]: PERF_RECORD_AUX offset: 0x28 size: 0x28 flags: 0 []
>
> Aggregated stats: (excludes AUX area (e.g. instruction trace) decoded / synthesized events)
> TOTAL events: 8859
> MMAP events: 120
> COMM events: 509
> EXIT events: 1
> FORK events: 507
> MMAP2 events: 7673
> AUX events: 8
> ITRACE_START events: 4
> SWITCH_CPU_WIDE events: 26
> FINISHED_ROUND events: 2
> AUXTRACE_INFO events: 1
> AUXTRACE events: 8
> intel_pt//u stats:
> dummy:u stats:
> [root@jouet ~]#
>
> Trying a suspend/resume now...

Scrap that theory, it still works after two suspend/resume cycles :-\

- ARnaldo