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authorArnaldo Carvalho de Melo <acme@redhat.com>2015-09-11 12:36:12 -0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-10-22 14:43:12 -0700
commit41e324d7edbb2c33a4492f8a5e65044609fe2732 (patch)
tree6eb9eb1eb8a9ea2249fc686b2e2efad26ce453b9 /tools
parent1477cb59bba427bab5dd7e91a448d0c1a11ac230 (diff)
perf header: Fixup reading of HEADER_NRCPUS feature
commit caa470475d9b59eeff093ae650800d34612c4379 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: fbe96f29ce4b ("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>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/header.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 918fd8ae2d80..23eea5e7fa94 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1426,7 +1426,7 @@ static int process_nrcpus(struct perf_file_section *section __maybe_unused,
if (ph->needs_swap)
nr = bswap_32(nr);
- ph->env.nr_cpus_online = nr;
+ ph->env.nr_cpus_avail = nr;
ret = readn(fd, &nr, sizeof(nr));
if (ret != sizeof(nr))
@@ -1435,7 +1435,7 @@ static int process_nrcpus(struct perf_file_section *section __maybe_unused,
if (ph->needs_swap)
nr = bswap_32(nr);
- ph->env.nr_cpus_avail = nr;
+ ph->env.nr_cpus_online = nr;
return 0;
}