[PATCHSET 00/27] perf tools: Add support to accumulate hist periods (v11)
From: Namhyung Kim
Date: Wed May 28 2014 - 23:58:42 EST
Hello,
This is a new attempt to implement cumulative hist period report.
This work begins from Arun's SORT_INCLUSIVE patch [1] but I completely
rewrote it from scratch.
This patchset basically adds period in a sample to every node in the
callchain. A hist_entry now has an additional fields to keep the
cumulative period if --children option is given on perf report.
I changed the option as a separate --children and added a new
"Children" column (and renamed the default "Overhead" column into
"Self"). The output will be sorted by children (cumulative) overhead
for now. It also adds 'overhead_children' field to -F/--fields option
to be selected by user and it'll show you "N/A" if the cumulation is
not supported (due to missing callchain).
I added Tested-by from Rodrigo Campos since this version is basically
rebase of previous series + bugfix. But it still needs to be tested
more intensively IMHO. Also note that, this will change default
behavior of perf report/top if callchain is recorded, so might confuse
old users. Let's see how many of them come to shout. :) I think we
need to merge Jiri's TUI column header patch at least.
* changes in v11:
- factor out hists__inc_nr_samples (Jiri)
- remove unrelated change (Jiri)
- disable accumulation on branch or mem mode
- slightly refactor hist_iter code
* changes in v10:
- fix callchain display bug in stdio, gtk
- add a testcase
- add Tested-by from Rodrigo
* changes in v9:
- support output field option
- add Acked-by tags from Jiri
* changes in v8:
- not depends on --percentage patchkit
- fix callchain resolving bug (Jiri)
- convert to sample__resolve_{mem,bstack}
- eliminate 'event' field from hist_entry_iter
* changes in v7:
- add Tested-by tags from Arun
- rebase onto current acme/perf/core
* changes in v6:
- separate struct hist_iter_ops (Jiri)
- check iter->he before calling ->add_entry_cb (Jiri)
- fix locking issue on perf top (Jiri)
* changes in v5:
- support both of --children and --call-graph (Arun)
- refactor hist_entry_iter to share with perf top (Jiri)
- various cleanups and fixes (Jiri)
- add ack's from Jiri
* changes in v4:
- change to --children option (Ingo)
- rebased on new annotation change (Arnaldo)
- support perf top also
- enable --children option by default (Ingo)
* changes in v3:
- change to --cumulate option
- fix a couple of bugs (Jiri, Rodrigo)
- rename some help functions (Arnaldo)
- cache previous hist entries rathen than just symbol and dso
- add some preparatory cleanups
- add report.cumulate config option
Let me show you an example:
$ cat abc.c
#define barrier() asm volatile("" ::: "memory")
void a(void)
{
int i;
for (i = 0; i < 1000000; i++)
barrier();
}
void b(void)
{
a();
}
void c(void)
{
b();
}
int main(void)
{
c();
return 0;
}
With this simple program I ran perf record and report:
$ perf record -g -e cycles:u ./abc
Case 1.
$ perf report --stdio --no-call-graph --no-children
# Overhead Command Shared Object Symbol
# ........ ....... ................. ..............
#
91.50% abc abc [.] a
8.18% abc ld-2.17.so [.] strlen
0.31% abc [kernel.kallsyms] [k] page_fault
0.01% abc ld-2.17.so [.] _start
Case 2. (current default behavior)
$ perf report --stdio --call-graph --no-children
# Overhead Command Shared Object Symbol
# ........ ....... ................. ..............
#
91.50% abc abc [.] a
|
--- a
b
c
main
__libc_start_main
8.18% abc ld-2.17.so [.] strlen
|
--- strlen
_dl_sysdep_start
0.31% abc [kernel.kallsyms] [k] page_fault
|
--- page_fault
_start
0.01% abc ld-2.17.so [.] _start
|
--- _start
Case 3.
$ perf report --no-call-graph --children --stdio
# Self Children Command Shared Object Symbol
# ........ ........ ....... ................. .....................
#
0.00% 91.50% abc libc-2.17.so [.] __libc_start_main
0.00% 91.50% abc abc [.] main
0.00% 91.50% abc abc [.] c
0.00% 91.50% abc abc [.] b
91.50% 91.50% abc abc [.] a
0.00% 8.18% abc ld-2.17.so [.] _dl_sysdep_start
8.18% 8.18% abc ld-2.17.so [.] strlen
0.01% 0.33% abc ld-2.17.so [.] _start
0.31% 0.31% abc [kernel.kallsyms] [k] page_fault
As you can see __libc_start_main -> main -> c -> b -> a callchain show
up in the output.
Finally, it looks like below with both option enabled:
Case 4. (default behavior?)
$ perf report --call-graph --children --stdio
# Self Children Command Shared Object Symbol
# ........ ........ ....... ................. .....................
#
0.00% 91.50% abc libc-2.17.so [.] __libc_start_main
|
--- __libc_start_main
0.00% 91.50% abc abc [.] main
|
--- main
__libc_start_main
0.00% 91.50% abc abc [.] c
|
--- c
main
__libc_start_main
0.00% 91.50% abc abc [.] b
|
--- b
c
main
__libc_start_main
91.50% 91.50% abc abc [.] a
|
--- a
b
c
main
__libc_start_main
...
Currently the perf enables both of --call-graph and --children when it
finds callchains in the samples. While this is useful for TUI or GTK,
I'm not sure for stdio as it'd consume so much lines.
It does not handle all kind of cases like event annotation yet, but I
really want to release it and get reviews.
You can also get this series on 'perf/cumulate-v11' branch in my tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
Any comments are welcome, thanks.
Namhyung
Cc: Arun Sharma <asharma@xxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
[1] https://lkml.org/lkml/2012/3/31/6
Namhyung Kim (27):
perf tools: Introduce hists__inc_nr_samples()
perf tools: Introduce struct hist_entry_iter
perf hists: Add support for accumulated stat of hist entry
perf hists: Check if accumulated when adding a hist entry
perf hists: Accumulate hist entry stat based on the callchain
perf tools: Update cpumode for each cumulative entry
perf report: Cache cumulative callchains
perf callchain: Add callchain_cursor_snapshot()
perf tools: Save callchain info for each cumulative entry
perf ui/hist: Add support to accumulated hist stat
perf ui/browser: Add support to accumulated hist stat
perf ui/gtk: Add support to accumulated hist stat
perf tools: Apply percent-limit to cumulative percentage
perf tools: Add more hpp helper functions
perf report: Add --children option
perf report: Add report.children config option
perf tools: Do not auto-remove Children column if --fields given
perf tools: Add callback function to hist_entry_iter
perf top: Convert to hist_entry_iter
perf top: Add --children option
perf top: Add top.children config option
perf tools: Enable --children option by default
perf ui/stdio: Fix invalid percentage value of cumulated hist entries
perf ui/gtk: Fix callchain display
perf tools: Reset output/sort order to default
perf tests: Define and use symbolic names for fake symbols
perf tests: Add a test case for cumulating callchains
tools/perf/Documentation/perf-report.txt | 7 +-
tools/perf/Documentation/perf-top.txt | 8 +-
tools/perf/Makefile.perf | 1 +
tools/perf/builtin-annotate.c | 5 +-
tools/perf/builtin-diff.c | 2 +-
tools/perf/builtin-report.c | 200 ++-------
tools/perf/builtin-sched.c | 2 +-
tools/perf/builtin-top.c | 89 ++--
tools/perf/tests/builtin-test.c | 4 +
tools/perf/tests/hists_common.c | 52 ++-
tools/perf/tests/hists_common.h | 32 +-
tools/perf/tests/hists_cumulate.c | 726 +++++++++++++++++++++++++++++++
tools/perf/tests/hists_filter.c | 39 +-
tools/perf/tests/hists_link.c | 36 +-
tools/perf/tests/hists_output.c | 31 +-
tools/perf/tests/tests.h | 1 +
tools/perf/ui/browsers/hists.c | 65 +--
tools/perf/ui/gtk/hists.c | 33 +-
tools/perf/ui/hist.c | 119 +++++
tools/perf/ui/stdio/hist.c | 8 +-
tools/perf/util/callchain.c | 45 +-
tools/perf/util/callchain.h | 11 +
tools/perf/util/hist.c | 513 +++++++++++++++++++++-
tools/perf/util/hist.h | 49 ++-
tools/perf/util/sort.c | 4 +
tools/perf/util/sort.h | 18 +-
tools/perf/util/symbol.c | 11 +-
tools/perf/util/symbol.h | 1 +
28 files changed, 1780 insertions(+), 332 deletions(-)
create mode 100644 tools/perf/tests/hists_cumulate.c
--
1.9.2
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