linux/tools/perf
Naveen N. Rao a4a03fc7ef perf evsel: Fix an issue where perf report fails to show the proper percentage
This patch fixes an issue where perf report shows nan% for certain
perf.data files. The below is from a report for a do_fork probe:

   -nan%           sshd  [kernel.kallsyms]  [k] do_fork
   -nan%    packagekitd  [kernel.kallsyms]  [k] do_fork
   -nan%    dbus-daemon  [kernel.kallsyms]  [k] do_fork
   -nan%           bash  [kernel.kallsyms]  [k] do_fork

A git bisect shows commit f3bda2c as the cause. However, looking back
through the git history, I saw commit 640c03c which seems to have
removed the required initialization for perf_sample->period. The problem
only started showing after commit f3bda2c. The below patch re-introduces
the initialization and it fixes the problem for me.

With the below patch, for the same perf.data:

  73.08%             bash  [kernel.kallsyms]  [k] do_fork
   8.97%      11-dhclient  [kernel.kallsyms]  [k] do_fork
   6.41%             sshd  [kernel.kallsyms]  [k] do_fork
   3.85%        20-chrony  [kernel.kallsyms]  [k] do_fork
   2.56%         sendmail  [kernel.kallsyms]  [k] do_fork

This patch applies over current linux-tip commit 9949284.

Problem introduced in:

$ git describe 640c03c
v2.6.37-rc3-83-g640c03c

Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: stable@kernel.org
Link: http://lkml.kernel.org/r/20120203170113.5190.25558.stgit@localhost6.localdomain6
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2012-02-06 18:59:38 -02:00
..
Documentation Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-01-15 11:26:35 -08:00
arch perf/powerpc: Fix build for PowerPC with uclibc toolchains 2011-11-25 14:11:27 +11:00
bench perf tools: Fix perf stack to non executable on x86_64 2012-02-06 18:54:06 -02:00
config perf tools: git mv tools/perf/{features-tests.mak,config/} 2011-04-19 08:18:36 -03:00
python perf evlist: Store pointer to the cpu and thread maps 2011-01-31 12:40:52 -02:00
scripts perf script: Add drop monitor script 2011-09-29 16:41:37 -03:00
util perf evsel: Fix an issue where perf report fails to show the proper percentage 2012-02-06 18:59:38 -02:00
.gitignore perf tools: Makefile: Remove various and sundry cruft 2011-02-18 07:43:06 -02:00
CREDITS perf_counter tools: Add CREDITS file for Git contributors 2009-06-24 19:54:29 +02:00
MANIFEST perf tools: Add const.h to MANIFEST to make perf-tar-src-pkg work again 2012-01-06 15:52:18 -02:00
Makefile perf tools: Fix broken build by defining _GNU_SOURCE in Makefile 2012-01-30 22:19:54 -02:00
builtin-annotate.c perf annotate: Get rid of field_sep check 2012-01-08 13:29:34 -02:00
builtin-bench.c perf options: Type check all the remaining OPT_ variants 2010-05-17 16:22:41 -03:00
builtin-buildid-cache.c perf buildid: add perfconfig option to specify buildid cache dir 2010-06-05 09:34:04 -03:00
builtin-buildid-list.c perf report: Accept fifos as input file 2011-12-23 17:01:03 -02:00
builtin-diff.c perf tools: Rename perf_event_ops to perf_tool 2011-11-28 10:39:28 -02:00
builtin-evlist.c perf report: Accept fifos as input file 2011-12-23 17:01:03 -02:00
builtin-help.c perf options: Type check all the remaining OPT_ variants 2010-05-17 16:22:41 -03:00
builtin-inject.c perf tools: Rename perf_event_ops to perf_tool 2011-11-28 10:39:28 -02:00
builtin-kmem.c perf kmem: Fix a memory leak 2012-01-08 13:27:54 -02:00
builtin-kvm.c perf kvm: Do guest-only counting by default 2012-01-06 15:47:37 -02:00
builtin-list.c perf list: Allow filtering list of events 2011-02-17 15:38:58 -02:00
builtin-lock.c perf report: Accept fifos as input file 2011-12-23 17:01:03 -02:00
builtin-probe.c perf tools: Fix broken build by defining _GNU_SOURCE in Makefile 2012-01-30 22:19:54 -02:00
builtin-record.c perf tools: Unify handling of features when writing feature section 2011-12-23 17:02:22 -02:00
builtin-report.c perf report: Accept fifos as input file 2011-12-23 17:01:03 -02:00
builtin-sched.c perf report: Accept fifos as input file 2011-12-23 17:01:03 -02:00
builtin-script.c perf script: Add missing closedir() calls 2012-01-08 12:35:41 -02:00
builtin-stat.c perf stat: Introduce get_ratio_color() helper 2012-01-03 14:36:32 -02:00
builtin-test.c perf test: Change type of '-v' option to INCR 2012-01-08 13:25:00 -02:00
builtin-timechart.c perf report: Accept fifos as input file 2011-12-23 17:01:03 -02:00
builtin-top.c perf top: Fix number of samples displayed 2012-01-30 22:29:49 -02:00
builtin.h perf tools: Make perf.data more self-descriptive (v8) 2011-10-07 17:01:24 -03:00
command-list.txt perf evlist: New command to list the names of events present in a perf.data file 2011-03-15 11:10:48 -03:00
design.txt perf: Fix few typos + cosmetics 2010-01-13 17:39:44 +01:00
perf-archive.sh perf buildid: add perfconfig option to specify buildid cache dir 2010-06-05 09:34:04 -03:00
perf.c perf tools: Simplify debugfs mountpoint handling code 2011-11-28 10:11:28 -02:00
perf.h perf record: Add ability to record event period 2011-12-20 12:50:09 -02:00