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Arnaldo Carvalho de Melo 708cd70fc7 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: Luis Henriques <luis.henriques@canonical.com>
History 2015-10-06 11:52:30 +01:00
..
arch perf tools: Add libdw DWARF post unwind support for ARM 2014-05-16 11:39:29 +02:00
bench Merge branch 'perf-core-for-mingo' into perf/urgent 2014-04-14 16:45:39 +02:00
config perf tools: Emit more precise message for missing glibc static library 2014-06-09 12:14:08 -03:00
Documentation perf/core improvements: 2014-06-12 13:54:42 +02:00
python perf python: Remove duplicate TID bit from mask 2013-08-07 17:35:25 -03:00
scripts perf tools: Finish the removal of 'self' arguments 2013-11-05 15:32:36 -03:00
tests perf tests: Add test for closing dso objects on EMFILE error 2014-06-12 16:53:23 +02:00
ui perf hists browser: Take the --comm, --dsos, etc filters into account 2015-08-11 09:57:26 +01:00
util perf header: Fixup reading of HEADER_NRCPUS feature 2015-10-06 11:52:30 +01:00
.gitignore perf tools: Ignore 'perf timechart' output file 2013-10-11 12:17:37 -03:00
builtin-annotate.c perf hists: Check if accumulated when adding a hist entry 2014-06-01 14:34:56 +02:00
builtin-bench.c perf bench: Fix segfault at the end of an 'all' execution 2014-04-14 12:55:53 +02:00
builtin-buildid-cache.c perf buildid-cache: Check relocation when checking for existing kcore 2014-01-31 17:21:54 -03:00
builtin-buildid-list.c perf session: Separating data file properties from session 2013-10-21 17:33:25 -03:00
builtin-diff.c perf hists: Check if accumulated when adding a hist entry 2014-06-01 14:34:56 +02:00
builtin-evlist.c perf evlist: Introduce evlist__for_each() & friends 2014-01-13 10:06:25 -03:00
builtin-help.c perf help: Fix --help for builtins 2012-10-22 12:35:49 -02:00
builtin-inject.c perf tools: Fix pipe check regression in attr event callback 2014-06-09 12:20:34 +02:00
builtin-kmem.c perf tools: Use tid for finding thread 2014-05-12 11:09:50 +02:00
builtin-kvm.c perf kvm: Fix 'Min time' counting in report command 2014-04-20 00:14:08 +02:00
builtin-list.c perf list: Add usage 2013-11-05 14:26:41 -03:00
builtin-lock.c perf lock: Introduce --list-cmds for use by scripts 2014-04-16 17:16:04 +02:00
builtin-mem.c perf mem: Introduce --list-cmds for use by scripts 2014-04-16 17:16:04 +02:00
builtin-probe.c perf probe: Show error code and description in verbose mode 2014-06-09 14:34:09 -03:00
builtin-record.c perf/tool: Add conditional branch filter 'cond' to perf record 2014-06-05 12:30:19 +02:00
builtin-report.c perf tools: Add callback function to hist_entry_iter 2014-06-01 14:35:05 +02:00
builtin-sched.c perf tools: Introduce hists__inc_nr_samples() 2014-06-01 14:34:55 +02:00
builtin-script.c perf evlist: Introduce evlist__for_each() & friends 2014-01-13 10:06:25 -03:00
builtin-stat.c perf stat: Get correct cpu id for print_aggr 2015-09-30 13:20:46 +01:00
builtin-timechart.c perf symbols: Record the reason for filtering an address_location 2014-03-18 18:16:57 -03:00
builtin-top.c perf top: Add top.children config option 2014-06-01 14:35:07 +02:00
builtin-trace.c perf trace: Decode architecture-specific signal numbers 2014-03-10 11:10:45 -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 some code references in design.txt 2014-03-18 18:17:06 -03:00
Makefile perf tools: Add 'build-test' make target 2014-01-16 16:26:26 -03:00
Makefile.perf perf tools: Prettify the tags/TAGS/cscope targets output 2014-06-09 12:21:02 +02:00
MANIFEST tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
perf-archive.sh perf archive: Make 'f' the last parameter for tar 2012-09-17 13:10:42 -03:00
perf-completion.sh perf sched: Introduce --list-cmds for use by scripts 2014-04-16 17:16:05 +02:00
perf-sys.h perf tools: Move sys_perf_event_open function from perf.h 2014-05-05 17:48:51 +02:00
perf.c perf tools: Add support to dynamically get cacheline size 2014-06-09 13:34:48 +02:00
perf.h perf tools: Move ACCESS_ONCE from perf.h header 2014-05-05 17:49:07 +02:00