linux-kernel - [tip:perf/urgent] perf c2c: Fix c2c report for empty numa node

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sat, 9 Mar 2019 12:05:37 -0800
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     jolsa@...nel.org, acme@...hat.com,
        alexander.shishkin@...ux.intel.com, mingo@...nel.org,
        jonas.rabenstein@...dium.uni-erlangen.de,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, hpa@...or.com,
        nasastry@...ibm.com, namhyung@...nel.org, jolsa@...hat.com,
        ak@...ux.intel.com, peterz@...radead.org,
        ravi.bangoria@...ux.ibm.com
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@...hat.com>
AuthorDate: Tue, 5 Mar 2019 16:25:29 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.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@...ibm.com>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Tested-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20190305152536.21035-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.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();