Namhyung Kim a1668c25a8 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 <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20170210073614.24584-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2017-02-13 14:29:36 -03:00

..

android.txt

perf tools: Update android build documentation

2016-07-04 20:27:27 -03:00

asciidoc.conf

perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/

2009-06-06 20:33:43 +02:00

Build.txt

perf build: Add build documentation

2015-02-12 17:53:00 -03:00

callchain-overhead-calculation.txt

perf tools: Document --children option in more detail

2015-04-29 10:38:06 -03:00

examples.txt

perf record: Remove -f/--force option

2013-07-08 17:37:25 -03:00

intel-bts.txt

perf tools: Add Intel BTS support

2015-08-21 11:34:10 -03:00

intel-pt.txt

perf intel-pt: Update documentation about context switch events

2016-11-11 13:18:52 -03:00

itrace.txt

perf tools: Add support for skipping itrace instructions

2016-03-30 11:14:09 -03:00

jit-interface.txt

perf symbols: Add description of JIT interface

2012-08-13 14:55:02 -03:00

jitdump-specification.txt

perf jit: Add jitdump format specification document

2016-10-24 11:07:41 -03:00

Makefile

tools: Move utilities.mak from perf to tools/scripts/

2016-03-18 13:57:20 -03:00

manpage-1.72.xsl

perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/

2009-06-06 20:33:43 +02:00

manpage-base.xsl

perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/

2009-06-06 20:33:43 +02:00

manpage-bold-literal.xsl

perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/

2009-06-06 20:33:43 +02:00

manpage-normal.xsl

perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/

2009-06-06 20:33:43 +02:00

manpage-suppress-sp.xsl

perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/

2009-06-06 20:33:43 +02:00

perf-annotate.txt

perf annotate: Introduce --stdio-color to setup the color output mode selection

2016-07-12 00:00:39 -03:00

perf-archive.txt

perf archive: Remove duplicated 'runs' in man page

2013-12-09 15:21:45 -03:00

perf-bench.txt

perf bench mem: Rename 'routine' to 'function'

2015-10-19 16:10:25 -03:00

perf-buildid-cache.txt

perf buildid-cache: Scan and import user SDT events to probe cache

2016-07-04 19:39:00 -03:00

perf-buildid-list.txt

perf report: Accept fifos as input file

2011-12-23 17:01:03 -02:00

perf-c2c.txt

perf c2c report: Coalesce by default only by pid,iaddr

2017-01-20 16:52:56 -03:00

perf-config.txt

perf config: Add support setting variables in a config file

2016-11-14 13:08:11 -03:00

perf-data.txt

perf data ctf: Add '--all' option for 'perf data convert'

2016-06-28 10:54:57 -03:00

perf-diff.txt

perf diff: Add 'delta-abs' compute method

2017-02-13 14:29:36 -03:00

perf-evlist.txt

perf evlist: Add --trace-fields option to show trace fields

2016-01-08 14:23:02 -03:00

perf-ftrace.txt

perf ftrace: Introduce new 'ftrace' tool

2017-01-26 11:43:01 -03:00

perf-help.txt

perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/

2009-06-06 20:33:43 +02:00

perf-inject.txt

perf inject: Add jitdump mmap injection support

2016-02-05 09:46:45 -03:00

perf-kallsyms.txt

perf kallsyms: Introduce tool to look for extended symbol information on the running kernel

2017-01-11 16:48:01 -03:00

perf-kmem.txt

perf kmem: Add option to specify time window of interest

2016-12-01 13:03:02 -03:00

perf-kvm.txt

perf tools: Configurable per thread proc map processing time out

2015-06-19 18:27:13 -03:00

perf-list.txt

perf list: Support long jevents descriptions

2016-10-03 21:35:47 -03:00

perf-lock.txt

perf lock: Account for lock average wait time

2013-10-09 11:24:01 -03:00

perf-mem.txt

perf mem: Add --ldlat option

2016-06-15 10:35:27 -03:00

perf-probe.txt

perf probe: Ignore vmlinux buildid if offline kernel is given

2016-09-01 09:44:14 -03:00

perf-record.txt

perf record: Add switch-output time option argument

2017-01-11 16:48:02 -03:00

perf-report.txt

perf tools: Explicitly document that --children is enabled by default

2016-12-07 12:00:35 -03:00

perf-sched.txt

perf sched timehist: Add --state option

2017-01-17 11:36:44 -03:00

perf-script-perl.txt

perf Documentation: Fix typos in perf/Documentation

2014-10-15 17:39:02 -03:00

perf-script-python.txt

perf Documentation: Fix typos in perf/Documentation

2014-10-15 17:39:02 -03:00

perf-script.txt

perf script: Fix man page about --dump-raw-trace option

2017-01-16 14:59:15 -03:00

perf-stat.txt

perf stat: Basic support for TopDown in perf stat

2016-06-06 17:04:15 -03:00

perf-test.txt

perf test: Add -F/--dont-fork option

2016-06-30 18:27:45 -03:00

perf-timechart.txt

perf timechart: Add more options to IO mode

2014-07-10 00:22:54 +02:00

perf-top.txt

perf tools: Explicitly document that --children is enabled by default

2016-12-07 12:00:35 -03:00

perf-trace.txt

perf trace: Allow specifying list of syscalls and events in -e/--expr/--event

2017-01-11 16:48:01 -03:00

perf.data-file-format.txt

perf tools: Update documentation info about quipper

2016-09-29 11:16:44 -03:00

perf.txt

perf tools: Handle -h and -v options

2015-10-05 16:36:18 -03:00

perfconfig.example

perf config: Show default report configuration in example and docs

2016-09-01 09:44:13 -03:00

tips.txt

perf top/report: Add tips about a list option

2016-10-05 19:51:53 -03:00