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| author | Ingo Molnar <mingo@kernel.org> | 2017-02-14 07:29:38 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-02-14 07:29:38 +0100 |
| commit | 277d6f1dcae09aed63cd4c7900a280b0e18cf2ca (patch) | |
| tree | fef746abe14f0cff91621405e501855df85d915d /tools/perf/Documentation/perf-diff.txt | |
| parent | Merge tag 'v4.10-rc8' into perf/core, to pick up fixes (diff) | |
| parent | samples/bpf: Reset global variables (diff) | |
| download | linux-277d6f1dcae09aed63cd4c7900a280b0e18cf2ca.tar.gz linux-277d6f1dcae09aed63cd4c7900a280b0e18cf2ca.zip | |
Merge tag 'perf-core-for-mingo-4.11-20170213' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core
Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:
New features:
- Introduce the 'delta-abs' 'perf diff' compute method, that orders the
histogram entries by the absolute value of the percentage delta for a
function in two perf.data files, i.e. the functions that changed the
most (increase or decrease in samples) comes first (Namhyung Kim)
User visible changes:
- Improve message about tweaking the kernel.perf_event_paranoid setting,
telling how to make the change permanent by editing /etc/sysctl.conf
(Arnaldo Carvalho de Melo)
Infrastructure changes:
- Introduce linux/compiler-gcc.h as a counterpart to the kernel's,
initially containing the definition of __fallthrough, more to
come (__maybe_unused, etc) (Arnaldo Carvalho de Melo)
- Fixes for problems uncovered by building tools/perf with clang, such
as always true tests of arrays against NULL and variables that sometimes
were used without being initialized (Arnaldo Carvalho de Melo, Steven Rostedt)
- Before loading a new ELF, clear global variables set by the
samples/bpf loader (Mickaël Salaün)
- Ignore already processed ELF sections in the samples/bpf
loader (Mickaël Salaün)
- Fix compile error in the scripting code with some perl5
versions (Wang YanQing)
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/perf/Documentation/perf-diff.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-diff.txt | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt index 3e9490b9c533..66dbe3dee74b 100644 --- a/tools/perf/Documentation/perf-diff.txt +++ b/tools/perf/Documentation/perf-diff.txt @@ -86,8 +86,9 @@ OPTIONS -c:: --compute:: - Differential computation selection - delta,ratio,wdiff (default is delta). - See COMPARISON METHODS section for more info. + Differential computation selection - delta, ratio, wdiff, delta-abs + (default is delta-abs). Default can be changed using diff.compute + config option. See COMPARISON METHODS section for more info. -p:: --period:: @@ -99,7 +100,11 @@ OPTIONS -o:: --order:: - Specify compute sorting column number. + Specify compute sorting column number. 0 means sorting by baseline + overhead and 1 (default) means sorting by computed value of column 1 + (data from the first file other base baseline). Values more than 1 + can be used only if enough data files are provided. + The default value can be set using the diff.order config option. --percentage:: Determine how to display the overhead percentage of filtered entries. @@ -181,6 +186,10 @@ with: relative to how entries are filtered. Use --percentage=absolute to prevent such fluctuation. +delta-abs +~~~~~~~~~ +Same as 'delta` method, but sort the result with the absolute values. + ratio ~~~~~ If specified the 'Ratio' column is displayed with value 'r' computed as: |