From: Jiri Olsa <[email protected]> [ Upstream commit e34c940245437f36d2c492edd1f8237eff391064 ]
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 <[email protected]> Signed-off-by: Jiri Olsa <[email protected]> Tested-by: Ravi Bangoria <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Jonas Rabenstein <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- 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 fb76423022e8..32e64a8a6443 100644 --- a/tools/perf/builtin-c2c.c +++ b/tools/perf/builtin-c2c.c @@ -1935,6 +1935,12 @@ 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); @@ -1943,8 +1949,6 @@ static int setup_nodes(struct perf_session *session) cpu2node[map->map[cpu]] = node; } - - nodes[node] = set; } setup_nodes_header(); -- 2.19.1
