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Subject[tip:perf/urgent] perf c2c: Fix c2c report for empty numa node
Commit-ID:  e34c940245437f36d2c492edd1f8237eff391064
Gitweb: https://git.kernel.org/tip/e34c940245437f36d2c492edd1f8237eff391064
Author: Jiri Olsa <jolsa@redhat.com>
AuthorDate: Tue, 5 Mar 2019 16:25:29 +0100
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 6 Mar 2019 18:15:24 -0300

perf c2c: Fix c2c report for empty numa node

Ravi Bangoria reported that we fail with an empty NUMA node with the
following message:

$ lscpu
NUMA node0 CPU(s):
NUMA node1 CPU(s): 0-4

$ sudo ./perf c2c report
node/cpu topology bugFailed setup nodes

Fix this by detecting the empty node and keeping its CPU set empty.

Reported-by: Nageswara R Sastry <nasastry@in.ibm.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190305152536.21035-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-c2c.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index 4272763a5e96..9e6cc868bdb4 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -2056,6 +2056,12 @@ static int setup_nodes(struct perf_session *session)
if (!set)
return -ENOMEM;

+ nodes[node] = set;
+
+ /* empty node, skip */
+ if (cpu_map__empty(map))
+ continue;
+
for (cpu = 0; cpu < map->nr; cpu++) {
set_bit(map->map[cpu], set);

@@ -2064,8 +2070,6 @@ static int setup_nodes(struct perf_session *session)

cpu2node[map->map[cpu]] = node;
}
-
- nodes[node] = set;
}

setup_nodes_header();
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