From a1668c25a8e1b53d00b2997ef5bc5e25c7a77235 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Fri, 10 Feb 2017 16:36:11 +0900 Subject: perf diff: Add 'delta-abs' compute method The 'delta-abs' compute method is same as 'delta' but shows entries with bigger absolute delta first instead of sorting numerically. This is only useful together with -o option. 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 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 0.00% +0.57% [kernel.kallsyms] [k] __rcu_read_unlock 0.16% +0.45% [kernel.kallsyms] [k] menu_select 0.72% -0.44% [kernel.kallsyms] [k] lookup_fast Signed-off-by: Namhyung Kim Cc: Jiri Olsa Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20170210073614.24584-2-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-diff.txt | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'tools/perf/Documentation') diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt index 3e9490b9c533..af80284cd2f6 100644 --- a/tools/perf/Documentation/perf-diff.txt +++ b/tools/perf/Documentation/perf-diff.txt @@ -86,7 +86,7 @@ OPTIONS -c:: --compute:: - Differential computation selection - delta,ratio,wdiff (default is delta). + Differential computation selection - delta,ratio,wdiff,delta-abs (default is delta). See COMPARISON METHODS section for more info. -p:: @@ -181,6 +181,10 @@ 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: -- cgit