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Arnaldo Carvalho de Melo caa470475d perf header: Fixup reading of HEADER_NRCPUS feature 
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>
2015-09-13 11:41:34 -03:00
..
arch tools include: Add basic atomic.h implementation from the kernel sources 2015-05-08 16:11:05 -03:00
build tools build: Allow duplicate objects in the object list 2015-08-26 10:34:58 -03:00
cgroup
firewire
hv tools: hv: add a python script lsvmbus to list VMBus devices 2015-08-05 11:44:29 -07:00
iio iio: lsiio: fix error code handling error 2015-08-12 19:26:22 +01:00
include tools: Restore export.h 2015-08-25 09:44:22 +02:00
laptop/freefall Move freefall program from Documentation/ to tools/ 2015-06-08 16:42:07 -06:00
lguest tools/lguest: don't use legacy definitions for net device in example launcher. 2015-02-13 17:15:55 +10:30
lib perf/core improvements and fixes: 2015-09-01 10:25:57 +02:00
net tools: bpf_jit_disasm: fix segfault on disabled debugging log output 2015-05-27 00:24:10 -04:00
nfsd
perf perf header: Fixup reading of HEADER_NRCPUS feature 2015-09-13 11:41:34 -03:00
power Additional ACPICA material for v4.2-rc1 2015-07-02 17:11:28 -07:00
scripts
testing Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-08-31 18:12:07 -07:00
thermal/tmon tools/thermal: tmon: fixed the 'make install' command 2015-05-09 13:36:58 +08:00
time
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 Staging driver patches for 4.2-rc1 2015-06-26 15:46:08 -07:00