* [patch 11/11] perf_event_open.2: add possibility of EBUSY error
@ 2015-07-23 17:16 Vince Weaver
[not found] ` <alpine.DEB.2.20.1507231316050.3742-6xBS8L8d439fDsnSvq7Uqyn2WXadKZNJe7X0jjDqjFGHXe+LvDLADg@public.gmane.org>
0 siblings, 1 reply; 2+ messages in thread
From: Vince Weaver @ 2015-07-23 17:16 UTC (permalink / raw)
To: Michael Kerrisk (man-pages)
Cc: linux-man-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA, Peter Zijlstra, Ingo Molnar,
Arnaldo Carvalho de Melo, Alexander Shishkin, Borislav Petkov,
Frederic Weisbecker, H. Peter Anvin, Kaixu Xia, Linus Torvalds,
Mike Galbraith, Robert Richter, Stephane Eranian, Thomas Gleixner,
adrian.hunter-ral2JQCrhuEAvxtiuMwx3w,
kan.liang-ral2JQCrhuEAvxtiuMwx3w,
markus.t.metzger-ral2JQCrhuEAvxtiuMwx3w,
mathieu.poirier-QSEj5FYQhm4dnm+yROfE0A, Vince Weaver
Linux 4.1 added the possibility of perf_event_open() returning
EBUSY if an existing exclusive event controls the PMU.
This was introduced by the following commit:
commit bed5b25ad9c8a2f5d735ef0bc746ec870c01c1b0
Author: Alexander Shishkin <alexander.shishkin-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Date: Fri Jan 30 12:31:06 2015 +0200
perf: Add a pmu capability for "exclusive" events
Signed-off-by: Alexander Shishkin <alexander.shishkin-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
Cc: Frederic Weisbecker <fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: H. Peter Anvin <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Cc: Kaixu Xia <kaixu.xia-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Cc: Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org>
Cc: Paul Mackerras <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
Cc: Robert Richter <rric-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Stephane Eranian <eranian-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Cc: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Cc: acme-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org
Cc: adrian.hunter-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Cc: kan.liang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Cc: markus.t.metzger-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Cc: mathieu.poirier-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org
Signed-off-by: Vince Weaver <vincent.weaver-e7X0jjDqjFGHXe+LvDLADg@public.gmane.org>
diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index b3cd93f..3d03786 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -2911,6 +2911,11 @@ the cgroup file descriptor in
.I pid
is not valid.
.TP
+.BR EBUSY " (since Linux 4.1)"
+.\" bed5b25ad9c8a2f5d735ef0bc746ec870c01c1b0
+Returned if another event already has exclusive
+access to the PMU.
+.TP
.B EFAULT
Returned if the
.I attr
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2015-07-23 17:16 [patch 11/11] perf_event_open.2: add possibility of EBUSY error Vince Weaver
[not found] ` <alpine.DEB.2.20.1507231316050.3742-6xBS8L8d439fDsnSvq7Uqyn2WXadKZNJe7X0jjDqjFGHXe+LvDLADg@public.gmane.org>
2015-10-14 6:47 ` Michael Kerrisk (man-pages)
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