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.
* changes in v3)
- put the value before callchains
- fix compile error
At first, 'folded' output mode was added. The folded output puts the
value, a space and all calchain nodes separated by semicolons. Now it
only supports --stdio as other UI provides some way of folding and/or
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
57
intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary
23
intel_idle;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;rest_init;...
$ 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-v3' 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 | 93 ++++++++++++++++++++++++++------
tools/perf/util/callchain.c | 87 +++++++++++++++++++++++++++++-
tools/perf/util/callchain.h | 24 ++++++++-
tools/perf/util/util.c | 3 +-
8 files changed, 205 insertions(+), 35 deletions(-)
--
2.6.2
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