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author | Stephane Eranian <eranian@google.com> | 2019-01-19 00:12:39 -0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 08:44:24 +0100 |
commit | aa7fb40263219c0a50bb9a39bb63d3db5477dc9a (patch) | |
tree | fde26a0be120e38ca6344e3e94adce02ca4d640b /tools | |
parent | a4fa2a1304120c426486f1149c8a98ea64f67aef (diff) | |
download | linux-stable-aa7fb40263219c0a50bb9a39bb63d3db5477dc9a.tar.gz linux-stable-aa7fb40263219c0a50bb9a39bb63d3db5477dc9a.tar.bz2 linux-stable-aa7fb40263219c0a50bb9a39bb63d3db5477dc9a.zip |
perf tools: Handle TOPOLOGY headers with no CPU
[ Upstream commit 1497e804d1a6e2bd9107ddf64b0310449f4673eb ]
This patch fixes an issue in cpumap.c when used with the TOPOLOGY
header. In some configurations, some NUMA nodes may have no CPU (empty
cpulist). Yet a cpumap map must be created otherwise perf abort with an
error. This patch handles this case by creating a dummy map.
Before:
$ perf record -o - -e cycles noploop 2 | perf script -i -
0x6e8 [0x6c]: failed to process type: 80
After:
$ perf record -o - -e cycles noploop 2 | perf script -i -
noploop for 2 seconds
Signed-off-by: Stephane Eranian <eranian@google.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1547885559-1657-1-git-send-email-eranian@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools')
-rw-r--r-- | tools/perf/util/cpumap.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c index 10af1e7524fb..f1aae86f7f6c 100644 --- a/tools/perf/util/cpumap.c +++ b/tools/perf/util/cpumap.c @@ -124,7 +124,12 @@ struct cpu_map *cpu_map__new(const char *cpu_list) if (!cpu_list) return cpu_map__read_all_cpu_map(); - if (!isdigit(*cpu_list)) + /* + * must handle the case of empty cpumap to cover + * TOPOLOGY header for NUMA nodes with no CPU + * ( e.g., because of CPU hotplug) + */ + if (!isdigit(*cpu_list) && *cpu_list != '\0') goto out; while (isdigit(*cpu_list)) { @@ -171,8 +176,10 @@ struct cpu_map *cpu_map__new(const char *cpu_list) if (nr_cpus > 0) cpus = cpu_map__trim_new(nr_cpus, tmp_cpus); - else + else if (*cpu_list != '\0') cpus = cpu_map__default_new(); + else + cpus = cpu_map__dummy_new(); invalid: free(tmp_cpus); out: |