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linux/tools/perf
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Arnaldo Carvalho de Melo 41e324d7ed perf header: Fixup reading of HEADER_NRCPUS feature 
commit caa470475d upstream.

The original patch introducing this header wrote the number of CPUs available
and online in one order and then swapped those values when reading, fix it.

Before:

  # perf record usleep 1
  # perf report --header-only | grep 'nrcpus \(online\|avail\)'
  # nrcpus online : 4
  # nrcpus avail : 4
  # echo 0 > /sys/devices/system/cpu/cpu2/online
  # perf record usleep 1
  # perf report --header-only | grep 'nrcpus \(online\|avail\)'
  # nrcpus online : 4
  # nrcpus avail : 3
  # echo 0 > /sys/devices/system/cpu/cpu1/online
  # perf record usleep 1
  # perf report --header-only | grep 'nrcpus \(online\|avail\)'
  # nrcpus online : 4
  # nrcpus avail : 2

After the fix, bringing back the CPUs online:

  # perf report --header-only | grep 'nrcpus \(online\|avail\)'
  # nrcpus online : 2
  # nrcpus avail : 4
  # echo 1 > /sys/devices/system/cpu/cpu2/online
  # perf record usleep 1
  # perf report --header-only | grep 'nrcpus \(online\|avail\)'
  # nrcpus online : 3
  # nrcpus avail : 4
  # echo 1 > /sys/devices/system/cpu/cpu1/online
  # perf record usleep 1
  # perf report --header-only | grep 'nrcpus \(online\|avail\)'
  # nrcpus online : 4
  # nrcpus avail : 4

Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Fixes: fbe96f29ce ("perf tools: Make perf.data more self-descriptive (v8)")
Link: http://lkml.kernel.org/r/20150911153323.GP23511@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2015-10-22 14:43:12 -07:00
..
arch perf tools: Add empty Build files for architectures lacking them 2015-10-22 14:43:12 -07:00
bench Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-05-06 10:47:25 -07:00
config perf build: Disable libbabeltrace check by default 2015-03-30 10:24:27 -03:00
Documentation perf kmem: Analyze page allocator events also 2015-04-13 11:44:52 -03:00
python perf python: Remove duplicate TID bit from mask 2013-08-07 17:35:25 -03:00
scripts perf build: Add scripts objects building 2015-02-12 11:49:53 -03:00
tests perf tools: Add 'I' event modifier for exclude_idle bit 2015-04-08 11:00:16 -03:00
ui perf hists browser: Take the --comm, --dsos, etc filters into account 2015-08-10 12:21:58 -07:00
util perf header: Fixup reading of HEADER_NRCPUS feature 2015-10-22 14:43:12 -07:00
.gitignore perf build: Use FEATURE-DUMP instead of PERF-FEATURES in the .gitignore file 2015-03-20 17:49:51 -03:00
Build perf tools: Add new 'perf data' command 2015-02-25 12:42:25 -03:00
builtin-annotate.c perf ordered_events: Shorten function signatures 2015-03-11 10:17:09 -03:00
builtin-bench.c perf bench: Add --repeat option 2014-06-19 16:13:15 -03:00
builtin-buildid-cache.c perf buildid-cache: Show usage with incorrect params 2015-02-27 15:52:40 -03:00
builtin-buildid-list.c perf ordered_events: Shorten function signatures 2015-03-11 10:17:09 -03:00
builtin-data.c perf data: Support using -f to override perf.data file ownership for 'convert' 2015-04-02 13:18:52 -03:00
builtin-diff.c perf diff: Add kallsyms option 2015-03-24 13:01:54 -03:00
builtin-evlist.c perf evlist: Support using -f to override perf.data file ownership 2015-04-02 13:18:45 -03:00
builtin-help.c perf tools: Add the bash completion for listing subsubcommands of perf help 2015-03-19 13:49:39 -03:00
builtin-inject.c perf inject: Support using -f to override perf.data file ownership 2015-04-02 13:18:45 -03:00
builtin-kmem.c perf kmem: Fix compiles on RHEL6/OL6 2015-04-24 12:44:47 -03:00
builtin-kvm.c perf kvm: Support using -f to override perf.data.guest file ownership 2015-04-02 13:18:47 -03:00
builtin-list.c perf list: Extend raw-dump to certain kind of events 2015-02-27 15:52:24 -03:00
builtin-lock.c perf lock: Support using -f to override perf.data file ownership 2015-04-02 13:18:48 -03:00
builtin-mem.c perf mem: Support using -f to override perf.data file ownership 2015-04-02 13:18:49 -03:00
builtin-probe.c perf probe: Check the orphaned -x option 2015-04-10 10:21:30 -03:00
builtin-record.c perf evlist: Fix type for references to data_head/tail 2015-04-10 11:29:20 -03:00
builtin-report.c perf report: Fix -T/--threads option to work again 2015-05-01 10:13:30 -03:00
builtin-sched.c perf sched replay: Use replay_repeat to calculate the runavg of cpu usage instead of the default value 10 2015-04-08 09:07:27 -03:00
builtin-script.c perf script: Support using -f to override perf.data file ownership 2015-04-02 13:18:50 -03:00
builtin-stat.c perf stat: Get correct cpu id for print_aggr 2015-10-22 14:43:12 -07:00
builtin-timechart.c perf timechart: Support using -f to override perf.data file ownership 2015-04-02 13:18:50 -03:00
builtin-top.c perf top: Fix a segfault when kernel map is restricted. 2015-04-27 13:24:32 -03:00
builtin-trace.c perf trace: Disable events and drain events when forked workload ends 2015-04-23 17:08:08 -03:00
builtin.h perf tools: Add new 'perf data' command 2015-02-25 12:42:25 -03:00
command-list.txt perf tools: Add new 'perf data' command 2015-02-25 12:42:25 -03:00
CREDITS perf_counter tools: Add CREDITS file for Git contributors 2009-06-24 19:54:29 +02:00
design.txt perf tools: Update some code references in design.txt 2014-03-18 18:17:06 -03:00
Makefile perf tools: Use getconf to determine number of online CPUs 2015-05-12 18:11:16 -03:00
Makefile.perf perf build: Disable libbabeltrace check by default 2015-03-30 10:24:27 -03:00
MANIFEST tools build: Add new build support 2015-02-11 18:30:03 -03:00
perf-archive.sh perf archive: Make 'f' the last parameter for tar 2012-09-17 13:10:42 -03:00
perf-completion.sh perf tools: Avoid confusion with preloaded bash function for perf bash completion 2015-03-19 13:53:27 -03:00
perf-read-vdso.c perf tools: Build programs to copy 32-bit compatibility 2014-10-29 10:32:48 -02:00
perf-sys.h perf tools: Avoid build splat for syscall numbers with uclibc 2015-01-16 17:49:29 -03:00
perf-with-kcore.sh perf tools: Add perf-with-kcore script 2014-09-17 17:08:08 -03:00
perf.c perf tools: Fix the bash completion problem of 'perf --*' 2015-02-27 15:52:28 -03:00
perf.h perf record: Add clockid parameter 2015-04-08 10:04:55 -03:00