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Arnaldo Carvalho de Melo 835199c03a perf header: Fixup reading of HEADER_NRCPUS feature 
[ Upstream commit caa470475d ]

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: Sasha Levin <sasha.levin@oracle.com>
History 2015-10-27 22:12:57 -04:00
..
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 Tools: hv: fix file overwriting of hv_fcopy_daemon 2014-07-09 14:21:26 -07:00
include tools: add more endian.h macros 2014-09-26 11:03:01 +02:00
lguest tools/lguest: offer VIRTIO_F_ANY_LAYOUT for net device. 2013-07-15 11:18:32 +09:30
lib tools lib traceevent kbuffer: Remove extra update to data pointer in PADDING 2015-05-17 19:12:09 -04:00
net tools: bpf_jit_disasm: increase image buffer size 2014-05-16 16:44:08 -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 2015-10-27 22:12:57 -04:00
power tools/power turbostat: Use $(CURDIR) instead of $(PWD) and add support for O= option in Makefile 2015-05-17 19:12:09 -04:00
scripts tools lib traceevent: Add global QUIET_CC_FPIC build output 2013-12-19 16:18:10 -03:00
testing ktest: Fix make_min_config to handle new assign_configs call 2015-01-16 06:59:46 -08:00
thermal/tmon tmon: set umask to a reasonable value 2014-07-01 22:00:51 +08:00
time tools: add script to test udelay 2014-07-23 10:16:38 -07:00
usb Linux 3.17-rc5 2014-09-16 09:53:59 -05:00
virtio tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
vm Revert "tools/vm: fix page-flags build" 2015-06-15 13:44:18 -04:00
Makefile tools/liblockdep: Build liblockdep from tools/Makefile 2014-05-08 13:34:45 -04:00