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| author | David Ahern <dsahern@gmail.com> | 2016-11-16 15:06:32 +0900 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-11-23 10:44:09 -0300 |
| commit | 6c973c90852c3fa4b4e76a061ce89dcd373efccc (patch) | |
| tree | 72efae60d507320855c1a1844b7d112d54411c44 /tools/perf/Documentation/perf-sched.txt | |
| parent | fc1469f1b20777929a47f6f8e55bca12c6f142ac (diff) | |
perf sched timehist: Add call graph options
If callchains were recorded they are appended to the line with a default stack depth of 5:
1.874569 [0011] gcc[31949] 0.014 0.000 1.148 wait_for_completion_killable <- do_fork <- sys_vfork <- stub_vfork <- __vfork
1.874591 [0010] gcc[31951] 0.000 0.000 0.024 __cond_resched <- _cond_resched <- wait_for_completion <- stop_one_cpu <- sched_exec
1.874603 [0010] migration/10[59] 3.350 0.004 0.011 smpboot_thread_fn <- kthread <- ret_from_fork
1.874604 [0011] <idle> 1.148 0.000 0.035 cpu_startup_entry <- start_secondary
1.874723 [0005] <idle> 0.016 0.000 1.383 cpu_startup_entry <- start_secondary
1.874746 [0005] gcc[31949] 0.153 0.078 0.022 do_wait sys_wait4 <- system_call_fastpath <- __GI___waitpid
--no-call-graph can be used to not show the callchains. --max-stack is used
to control the number of frames shown (default of 5). -x/--excl options can
be used to collapse redundant callchains to get more relevant data on screen.
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20161116060634.28477-7-namhyung@kernel.org
[ Add documentation based on above commit message ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-sched.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-sched.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt index 9a77bc73e8a3..83452088727d 100644 --- a/tools/perf/Documentation/perf-sched.txt +++ b/tools/perf/Documentation/perf-sched.txt @@ -99,6 +99,13 @@ OPTIONS for 'perf sched timehist' --kallsyms=<file>:: kallsyms pathname +-g:: +--no-call-graph:: + Do not display call chains if present. + +--max-stack:: + Maximum number of functions to display in backtrace, default 5. + -s:: --summary:: Show only a summary of scheduling by thread with min, max, and average |