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8388deb3ba
When it records callchains, they will always have 2 scheduler functions
(__schedule + schedule or __schedule + preempt_schedule) and get
ignored. So it should collect 2 more functions to show the expected
number of callchains to user.
Committer Notes:
Example of final result, using the same perf.data file as in the
previous cset comment, but this time redirecting the output of 'perf
sched timehist' to a file instead of copy'n'pasting from xterm:
[root@jouet experimental]# perf sched timehist > /tmp/bla
[root@jouet experimental]# cat /tmp/bla
time cpu task name wait time sch delay run time
[tid/pid] (msec) (msec) (msec)
-------- ---- -------------------- ------ ------ -----
6.494998 [01] <idle> 0.000 0.000 0.000
6.495027 [02] perf[519] 0.000 0.000 0.000 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_poll
6.495096 [03] <idle> 0.000 0.000 0.000
6.495100 [03] rcuos/0[9] 0.000 0.005 0.003 rcu_nocb_kthread <- kthread <- ret_from_fork
6.495113 [01] perf[520] 0.000 0.008 0.114 preempt_schedule_common <- _cond_resched <- wait_for_completion <- stop_one_cpu <- sched_exec <- do_execveat_common.isra.35
6.495121 [00] <idle> 0.000 0.000 0.000
6.495129 [01] migration/1[17] 0.000 0.003 0.016 smpboot_thread_fn <- kthread <- ret_from_fork
6.496085 [02] <idle> 0.000 0.000 1.057
6.496096 [02] kworker/u16:1[31169] 0.000 0.004 0.011 worker_thread <- kthread <- ret_from_fork
6.496096 [03] <idle> 0.003 0.000 0.996
6.496169 [02] <idle> 0.011 0.000 0.072
6.496171 [00] ls[520] 0.008 0.000 1.049 do_exit <- do_group_exit <- [unknown] <- entry_SYSCALL_64_fastpath
6.496172 [03] gnome-terminal-[4391] 0.000 0.003 0.076 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_poll
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20161124011114.7102-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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