linux-kernel - Re: [PATCH] perf c2c: Fix c2c report for empty numa node

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Date:   Fri, 1 Mar 2019 11:26:44 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Cc:     acme@...nel.org, alexander.shishkin@...ux.intel.com,
        namhyung@...nel.org, eranian@...gle.com,
        linux-kernel@...r.kernel.org, tonyj@...e.com, nasastry@...ibm.com
Subject: Re: [PATCH] perf c2c: Fix c2c report for empty numa node

On Fri, Mar 01, 2019 at 12:35:39PM +0530, Ravi Bangoria wrote:
> 
> On 2/28/19 9:52 PM, Jiri Olsa wrote:
> > how about attached change (untested)?
> 
> LGTM. Would you mind sending a patch.

attached, please test on your system

thanks,
jirka

---
Ravi Bangoria reported that we fail with empty
numa node with following message:

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

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

Fixing this by detecting empty node and keeping
its cpu set empty.

Reported-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Link: http://lkml.kernel.org/n/tip-dyq5jo6pn1j3yqavb5ukjwwu@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 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();
-- 
2.17.2