Hello,
This is what Brendan requested on the perf-users mailing list [1] to
support FlameGraphs [2] 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. Now it only supports --stdio as other UI provides some way of
folding/expanding callchains dynamically.
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 --stdio --show-total-period -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 --stdio --show-nr-samples -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-v2' 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.spinics.net/lists/linux-perf-users/msg02498.html
[2] http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html
Namhyung Kim (4):
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
tools/perf/Documentation/perf-report.txt | 13 +++--
tools/perf/builtin-report.c | 4 +-
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, 204 insertions(+), 34 deletions(-)
--
2.6.2
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