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| author | Namhyung Kim <namhyung@kernel.org> | 2015-11-09 14:45:37 +0900 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-11-19 13:19:22 -0300 |
| commit | 26e779245dd6f5270c0696860438e5c03d0780fd (patch) | |
| tree | d1ede86280f98fd6684339e03b4431ef4c1125db /tools/perf/Documentation | |
| parent | 566c69c36e6178774dd484ea4a02b76f6bd0ede4 (diff) | |
| download | linux-26e779245dd6f5270c0696860438e5c03d0780fd.tar.bz2 | |
perf report: Support folded callchain mode on --stdio
Add new call chain option (-g) 'folded' to print callchains in a line.
The callchains are separated by semicolons, and preceded by (absolute)
percent values and a space.
For example, the following 20 lines can be printed in 3 lines with the
folded output mode:
$ perf report -g flat --no-children | grep -v ^# | head -20
60.48% swapper [kernel.vmlinux] [k] intel_idle
54.60%
intel_idle
cpuidle_enter_state
cpuidle_enter
call_cpuidle
cpu_startup_entry
start_secondary
5.88%
intel_idle
cpuidle_enter_state
cpuidle_enter
call_cpuidle
cpu_startup_entry
rest_init
start_kernel
x86_64_start_reservations
x86_64_start_kernel
$ perf report -g folded --no-children | grep -v ^# | head -3
60.48% swapper [kernel.vmlinux] [k] intel_idle
54.60% intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary
5.88% intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;x86_64_start_kernel
This mode is supported only for --stdio now and intended to be used by
some scripts like in FlameGraphs[1]. Support for other UI might be
added later.
[1] http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html
Requested-and-Tested-by: Brendan Gregg <brendan.d.gregg@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1447047946-1691-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf-report.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt index 5ce8da1e1256..f7d81aac9188 100644 --- a/tools/perf/Documentation/perf-report.txt +++ b/tools/perf/Documentation/perf-report.txt @@ -181,6 +181,7 @@ OPTIONS - graph: use a graph tree, displaying absolute overhead rates. (default) - fractal: like graph, but displays relative rates. Each branch of the tree is considered as a new profiled object. + - folded: call chains are displayed in a line, separated by semicolons - none: disable call chain display. threshold is a percentage value which specifies a minimum percent to be |