Messages in this thread | | | From | Namhyung Kim <> | Subject | [PATCHSET 0/4] perf diff: Introduce delta-abs compute method (v2) | Date | Fri, 10 Feb 2017 16:36:10 +0900 |
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Hello,
This patchset adds 'delta-abs' compute method to -c/--compute option. The 'delta-abs' is same as 'delta' but shows entries with bigger absolute delta first instead of sorting numerically. This is only useful together with -o option.
* v2 changes - rebase onto acme/perf/core - change default option to '-o 1 -c delta-abs'
Below is default output (-c delta):
$ perf diff -o 1 -c delta | grep -v ^# | head 42.22% +4.97% [kernel.kallsyms] [k] cfb_imageblit 0.62% +1.23% [kernel.kallsyms] [k] mutex_lock +1.15% [kernel.kallsyms] [k] copy_user_generic_string 2.40% +0.95% [kernel.kallsyms] [k] bit_putcs 0.31% +0.79% [kernel.kallsyms] [k] link_path_walk +0.64% [kernel.kallsyms] [k] kmem_cache_alloc 0.00% +0.57% [kernel.kallsyms] [k] __rcu_read_unlock +0.45% [kernel.kallsyms] [k] alloc_set_pte 0.16% +0.45% [kernel.kallsyms] [k] menu_select +0.41% ld-2.24.so [.] do_lookup_x
Now with 'delta-abs' it shows entries have bigger delta value either positive or negative.
$ perf diff -o 1 -c delta-abs | grep -v ^# | head 42.22% +4.97% [kernel.kallsyms] [k] cfb_imageblit 12.72% -3.01% [kernel.kallsyms] [k] intel_idle 9.72% -1.31% [unknown] [.] 0x0000000000411343 0.62% +1.23% [kernel.kallsyms] [k] mutex_lock +1.15% [kernel.kallsyms] [k] copy_user_generic_string 2.40% +0.95% [kernel.kallsyms] [k] bit_putcs 0.31% +0.79% [kernel.kallsyms] [k] link_path_walk 1.35% -0.71% [kernel.kallsyms] [k] smp_call_function_single +0.64% [kernel.kallsyms] [k] kmem_cache_alloc 0.00% +0.57% [kernel.kallsyms] [k] __rcu_read_unlock
The patch 2 and 3 are to add config options to control the default behavior of perf diff command. And patch 4 changes the default setting.
The code is avaiable at 'perf/diff-delta-abs-v2' branch in
git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
Thanks, Namhyung
Namhyung Kim (4): perf diff: Add 'delta-abs' compute method perf diff: Add diff.order config option perf diff: Add diff.compute config option perf diff: Change default setting to "delta-abs"
tools/perf/Documentation/perf-config.txt | 12 +++++ tools/perf/Documentation/perf-diff.txt | 15 ++++-- tools/perf/builtin-diff.c | 78 ++++++++++++++++++++++++++++++-- 3 files changed, 98 insertions(+), 7 deletions(-)
-- 2.11.0
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