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linux/tools/perf
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Arnaldo Carvalho de Melo b200a84e6b 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>
2015-10-22 14:37:49 -07:00
..
arch perf tools: Fix build on non-glibc systems due to libio.h absence 2013-03-15 13:05:13 -03:00
bench perf tools: Fix LIBNUMA build with glibc 2.12 and older. 2013-03-14 08:06:21 -03:00
config perf tools: Revert regression in configuration of Python support 2013-08-04 16:51:17 +08:00
Documentation perf tools: Add new mem command for memory access profiling 2013-04-01 12:21:44 -03:00
python perf python: Use attr.watermark in twatch.py 2012-01-30 18:38:23 -02:00
scripts perf: net_dropmonitor: Remove progress indicator 2013-05-22 15:10:11 -07:00
tests Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-04-30 09:36:50 -07:00
ui perf tools: Remove cast of non-variadic function to variadic 2013-12-04 10:55:49 -08:00
util perf header: Fixup reading of HEADER_NRCPUS feature 2015-10-22 14:37:49 -07:00
.gitignore perf tools: Ignore compiled python binaries 2012-09-07 12:10:58 -03:00
bash_completion perf tools: Complete tracepoint event names 2012-10-04 12:44:52 -03:00
builtin-annotate.c perf tools: Add support for weight v7 (modified) 2013-04-01 12:19:43 -03:00
builtin-bench.c perf tools: Make numa benchmark optional 2013-01-30 10:36:21 -03:00
builtin-buildid-cache.c perf buildid-cache: Add --update option 2013-02-14 14:59:27 -03:00
builtin-buildid-list.c perf symbols: Generalize filter in __fprintf_buildid methods 2012-12-09 08:46:07 -03:00
builtin-diff.c perf tools: Add support for weight v7 (modified) 2013-04-01 12:19:43 -03:00
builtin-evlist.c perf evlist: Pass the event_group info via perf_attr_details 2013-02-06 18:09:28 -03:00
builtin-help.c perf help: Fix --help for builtins 2012-10-22 12:35:49 -02:00
builtin-inject.c perf inject: Mark a dso if it's used 2012-10-26 11:22:25 -02:00
builtin-kmem.c perf kmem: Make it work again on non NUMA machines 2014-10-05 14:54:14 -07:00
builtin-kvm.c perf tools: Introduce tools/lib/lk library 2013-03-15 13:06:00 -03:00
builtin-list.c perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
builtin-lock.c perf tools: Add a global variable "const char *input_name" 2012-10-29 11:45:34 -02:00
builtin-mem.c perf tools: Add new mem command for memory access profiling 2013-04-01 12:21:44 -03:00
builtin-probe.c perf tools: Introduce tools/lib/lk library 2013-03-15 13:06:00 -03:00
builtin-record.c perf tools: Add support for weight v7 (modified) 2013-04-01 12:19:43 -03:00
builtin-report.c perf tools: Remove dependency on libnewt 2013-04-01 12:23:21 -03:00
builtin-sched.c Revert "perf sched: Handle PERF_RECORD_EXIT events" 2013-04-01 12:22:34 -03:00
builtin-script.c perf script: Don't display trace info when invoking scripts 2013-01-24 16:40:52 -03:00
builtin-stat.c perf stat: Add per-core aggregation 2013-03-25 16:13:26 -03:00
builtin-timechart.c perf tools: Add a global variable "const char *input_name" 2012-10-29 11:45:34 -02:00
builtin-top.c perf tools: Add support for weight v7 (modified) 2013-04-01 12:19:43 -03:00
builtin-trace.c perf trace: Free evlist resources properly on return path 2013-03-15 13:06:11 -03:00
builtin.h perf tools: Add new mem command for memory access profiling 2013-04-01 12:21:44 -03:00
command-list.txt perf tools: Add new mem command for memory access profiling 2013-04-01 12:21:44 -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 ioctl documentation for PERF_IOC_FLAG_GROUP 2012-05-31 11:38:42 -03:00
Makefile perf tools: Remove dependency on libnewt 2013-04-01 12:23:21 -03:00
MANIFEST perf tools: Introduce tools/lib/lk library 2013-03-15 13:06:00 -03:00
perf-archive.sh perf archive: Make 'f' the last parameter for tar 2012-09-17 13:10:42 -03:00
perf.c perf tools: Convert needless static variable to local 2013-04-01 12:22:48 -03:00
perf.h perf tools: Add support for weight v7 (modified) 2013-04-01 12:19:43 -03:00