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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
..
build perf tools: Fix build breakage if prefix= is specified 2015-06-29 12:35:28 -07:00
cgroup cgroups: fix cgroup_event_listener error handling 2013-01-08 10:00:44 -08:00
firewire tools/firewire: nosy-dump: check for allocation failure 2012-12-02 20:10:18 +01:00
hv hv: hypervvssd: call endmntent before call setmntent again 2015-03-25 11:53:54 +01:00
iio tools: iio: generic_buffer: Fix generic scale extraction 2015-03-28 11:01:49 +00:00
include tools: Remove bitops/hweight usage of bits in tools/perf 2015-01-16 17:49:29 -03:00
lguest tools/lguest: don't use legacy definitions for net device in example launcher. 2015-02-13 17:15:55 +10:30
lib Merge branch 'liblockdep-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux into perf/urgent 2015-05-15 08:43:15 +02:00
net tools: bpf_jit_disasm: fix segfault on disabled debugging log output 2015-05-27 00:24:10 -04:00
nfsd NFSD: Added fault injection script 2011-11-07 21:10:47 -05:00
perf perf header: Fixup reading of HEADER_NRCPUS feature 2015-10-22 14:43:12 -07:00
power tools/power turbostat: update version number to 4.7 2015-05-27 18:04:01 -04:00
scripts tools lib traceevent: Add global QUIET_CC_FPIC build output 2013-12-19 16:18:10 -03:00
testing tools selftests: Fix 'clean' target with make 3.81 2015-07-21 10:10:02 -07:00
thermal/tmon tools/thermal: tmon: fixed the 'make install' command 2015-05-09 13:36:58 +08:00
time tools: add script to test udelay 2014-07-23 10:16:38 -07:00
usb tools: ffs-aio-example: use endpoint addresses from descriptors 2015-01-15 09:41:49 -06:00
virtio tools/virtio: add virtio 1.0 in vringh_test 2014-12-15 23:49:22 +02:00
vm tools: Fix tools/vm build 2015-05-12 18:11:06 -03:00
Makefile tools/liblockdep: Build liblockdep from tools/Makefile 2014-05-08 13:34:45 -04:00