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SubjectRe: perf sched broken on tip, bisected
On 02/23/10 04:09, Arnaldo Carvalho de Melo wrote:
> While testing a patch series I'm working on I noticed that 'perf sched record ;
> perf sched latency' is broken on tip, bisected it down to this cset, investigating...
>

I couldn't reproduce your problem on tip/master (
ae37d2288d22938bd48b552f83d3e01c41fd42f9 ),
could you give me a pointer to your testing patch series?

> [acme@mica linux-2.6-tip]$ git bisect good
> 86d8d29634de4464d568e7c335c0da6cba64e8ab is first bad commit
> commit 86d8d29634de4464d568e7c335c0da6cba64e8ab
> Author: Hitoshi Mitake<mitake@dcl.info.waseda.ac.jp>
> Date: Sat Jan 30 20:43:23 2010 +0900
>
> perf tools: Add __data_loc support
>
> This patch is required to test the next patch for perf lock.
>
> At 064739bc4b3d7f424b2f25547e6611bcf0132415 ,
> support for the modifier "__data_loc" of format is added.
>
> But, when I wanted to parse format of lock_acquired (or some
> event else), raw_field_ptr() did not returned correct pointer.
>
> So I modified raw_field_ptr() like this patch. Then
> raw_field_ptr() works well.
>
> Signed-off-by: Hitoshi Mitake<mitake@dcl.info.waseda.ac.jp>
> Acked-by: Frederic Weisbecker<fweisbec@gmail.com>
> Cc: Peter Zijlstra<a.p.zijlstra@chello.nl>
> Cc: Paul Mackerras<paulus@samba.org>
> Cc: Tom Zanussi<tzanussi@gmail.com>
> Cc: Steven Rostedt<srostedt@redhat.com>
> LKML-Reference:<1264851813-8413-2-git-send-email-mitake@dcl.info.waseda.ac.jp>
> [ v3: fixed minor stylistic detail ]
> Signed-off-by: Ingo Molnar<mingo@elte.hu>
>
> :040000 040000 8650752c9d8295e3c0ae3999b237fb86eb269e5d eb3ecfba6bfbcc80ecde51e10307fefc4d43864e M tools
> [acme@mica linux-2.6-tip]$
>
> (gdb) run sched latency
> Starting program: /root/bin/perf sched latency
> [Thread debugging using libthread_db enabled]
> [Detaching after fork from child process 30314. (Try `set detach-on-fork off'.)]
> [New Thread 139670509008608 (LWP 30311)]
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 139670509008608 (LWP 30311)]
> 0x000000000040df1b in process_sched_switch_event (data=0x7f079312f9fc, session=0xcaf780, event=0xcaff50, this_cpu=3, timestamp=3964393249899, thread=0xd21ea0) at builtin-sched.c:1489
> 1489 FILL_ARRAY(switch_event, prev_comm, event, data);
> (gdb) bt
> #0 0x000000000040df1b in process_sched_switch_event (data=0x7f079312f9fc, session=0xcaf780, event=0xcaff50, this_cpu=3, timestamp=3964393249899, thread=0xd21ea0) at builtin-sched.c:1489
> #1 0x000000000040e508 in process_raw_event (raw_event=0x7f079312f9d0, session=0xcaf780, data=0x7f079312f9fc, cpu=3, timestamp=3964393249899, thread=0xd21ea0) at builtin-sched.c:1594
> #2 0x000000000040e7ec in process_sample_event (event=0x7f079312f9d0, session=0xcaf780) at builtin-sched.c:1639
> #3 0x000000000043be6f in perf_session__process_event (self=0xcaf780, event=0x7f079312f9d0, ops=0x6878e0, offset=0, head=117200) at util/session.c:298
> #4 0x000000000043c5f0 in perf_session__process_events (self=0xcaf780, ops=0x6878e0) at util/session.c:464
> #5 0x000000000040e8e0 in read_events () at builtin-sched.c:1667
> #6 0x000000000040edb7 in __cmd_lat () at builtin-sched.c:1708
> #7 0x000000000040f355 in cmd_sched (argc=1, argv=0x7fff2a064640, prefix=0x0) at builtin-sched.c:1911
> #8 0x0000000000404fdd in run_builtin (p=0x682cd0, argc=2, argv=0x7fff2a064640) at perf.c:264
> #9 0x00000000004051b3 in handle_internal_command (argc=2, argv=0x7fff2a064640) at perf.c:329
> #10 0x00000000004052f2 in run_argv (argcp=0x7fff2a064534, argv=0x7fff2a064528) at perf.c:373
> #11 0x00000000004054ce in main (argc=2, argv=0x7fff2a064640) at perf.c:457
> (gdb)
>



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