Messages in this thread | | | From | Namhyung Kim <> | Subject | [RFC/PATCH 0/5] perf report: Support folded callchain output (v1) | Date | Sat, 31 Oct 2015 02:15:33 +0900 |
| |
Hello,
This is what Brendan requested on the perf-users mailing list to support FlameGraphs [1] more efficiently. This patchset adds a few more callchain options to adjust the output for it.
At first, 'folded' output mode was added. The folded output puts all calchain nodes in a line separated by semicolons, a space and the value.
The value is now can be one of 'percent', 'period', or 'count'. The percent is current default output and the period is the raw number of sample periods. The count is the number of samples for each callchain.
Here's an example:
$ perf report --no-children --show-nr-samples --stdio -g folded,count ... 39.93% 80 swapper [kernel.vmlinux] [k] intel_idel intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary 57 intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;rest_init;... 23
$ perf report --no-children --stdio -g percent ... 39.93% swapper [kernel.vmlinux] [k] intel_idel | ---intel_idle cpuidle_enter_state cpuidle_enter call_cpuidle cpu_startup_entry | |--28.63%-- start_secondary | --11.30%-- rest_init
$ perf report --no-children --show-total-period --stdio -g period ... 39.93% 13018705 swapper [kernel.vmlinux] [k] intel_idel | ---intel_idle cpuidle_enter_state cpuidle_enter call_cpuidle cpu_startup_entry | |--9334403-- start_secondary | --3684302-- rest_init
$ perf report --no-children --show-nr-samples --stdio -g count ... 39.93% 80 swapper [kernel.vmlinux] [k] intel_idel | ---intel_idle cpuidle_enter_state cpuidle_enter call_cpuidle cpu_startup_entry | |--57-- start_secondary | --23-- rest_init
You can get it from 'perf/callchain-fold-v1' branch on my tree:
git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
Any comments are welcome, thanks Namhyung
[1] http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html
Namhyung Kim (5): perf report: Support folded callchain mode on --stdio perf callchain: Abstract callchain print function perf callchain: Add count fields to struct callchain_node perf report: Add callchain value option perf report: Fix segfault on -g fractral with --stdio
tools/perf/Documentation/perf-report.txt | 13 +++-- tools/perf/builtin-report.c | 2 +- tools/perf/ui/browsers/hists.c | 8 +-- tools/perf/ui/gtk/hists.c | 8 +-- tools/perf/ui/stdio/hist.c | 91 ++++++++++++++++++++++++++------ tools/perf/util/callchain.c | 87 +++++++++++++++++++++++++++++- tools/perf/util/callchain.h | 24 ++++++++- tools/perf/util/util.c | 3 +- 8 files changed, 203 insertions(+), 33 deletions(-)
-- 2.6.2
| |