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Message-ID: <tip-2b42b09b88c831ba4da2d669581dde371c38c2af@git.kernel.org>
Date: Fri, 26 Jun 2015 01:43:27 -0700
From: tip-bot for Srikar Dronamraju <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: acme@...hat.com, mingo@...nel.org, tglx@...utronix.de,
namhyung@...nel.org, jolsa@...nel.org, srikar@...ux.vnet.ibm.com,
masami.hiramatsu.pt@...achi.com, vlee@...tter.com,
linux-kernel@...r.kernel.org, hpa@...or.com
Subject: [tip:perf/urgent] perf bench numa:
Fix to show proper convergence stats
Commit-ID: 2b42b09b88c831ba4da2d669581dde371c38c2af
Gitweb: http://git.kernel.org/tip/2b42b09b88c831ba4da2d669581dde371c38c2af
Author: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
AuthorDate: Wed, 24 Jun 2015 16:40:04 +0530
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 25 Jun 2015 12:28:35 -0300
perf bench numa: Fix to show proper convergence stats
With commit: e1e455f4f4d3 (perf tools: Work around lack of sched_getcpu
in glibc < 2.6), perf_bench numa mem with -c or -m option is not able to
correctly calculate convergence.
With the above commit, sched_getcpu always seems to return -1. The
intention of commit e1e455f was to add a sched_getcpu in glibc < 2.6.
Hence keep the sched_getcpu definition under an ifdef.
This regression happened occurred between v4.0 and v4.1
Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Acked-by: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Vinson Lee <vlee@...tter.com>
Fixes: e1e455f4f4d3 ("perf tools: Work around lack of sched_getcpu in glibc < 2.6")
Link: http://lkml.kernel.org/r/20150624111004.GA5220@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/util/cloexec.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/tools/perf/util/cloexec.c b/tools/perf/util/cloexec.c
index 85b5238..2babdda 100644
--- a/tools/perf/util/cloexec.c
+++ b/tools/perf/util/cloexec.c
@@ -7,11 +7,15 @@
static unsigned long flag = PERF_FLAG_FD_CLOEXEC;
+#ifdef __GLIBC_PREREQ
+#if !__GLIBC_PREREQ(2, 6)
int __weak sched_getcpu(void)
{
errno = ENOSYS;
return -1;
}
+#endif
+#endif
static int perf_flag_probe(void)
{
--
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