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authorNamhyung Kim <namhyung@kernel.org>2015-11-09 14:45:37 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-11-19 13:19:22 -0300
commit26e779245dd6f5270c0696860438e5c03d0780fd (patch)
treed1ede86280f98fd6684339e03b4431ef4c1125db /tools/perf/Documentation/perf-report.txt
parent566c69c36e6178774dd484ea4a02b76f6bd0ede4 (diff)
downloadlinux-26e779245dd6f5270c0696860438e5c03d0780fd.tar.gz
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/perf-report.txt')
-rw-r--r--tools/perf/Documentation/perf-report.txt1
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