On 07/23/2015 07:16 PM, Vince Weaver wrote: > > Linux 4.1 added the possibility of perf_event_open() returning > EBUSY if an existing exclusive event controls the PMU. Thanks, Vince. Applied. Cheers, Michael > This was introduced by the following commit: > > commit bed5b25ad9c8a2f5d735ef0bc746ec870c01c1b0 > Author: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> > Date: Fri Jan 30 12:31:06 2015 +0200 > > perf: Add a pmu capability for "exclusive" events > > Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> > Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> > Cc: Borislav Petkov <bp@xxxxxxxxx> > Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> > Cc: H. Peter Anvin <hpa@xxxxxxxxx> > Cc: Kaixu Xia <kaixu.xia@xxxxxxxxxx> > Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > Cc: Mike Galbraith <efault@xxxxxx> > Cc: Paul Mackerras <paulus@xxxxxxxxx> > Cc: Robert Richter <rric@xxxxxxxxxx> > Cc: Stephane Eranian <eranian@xxxxxxxxxx> > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Cc: acme@xxxxxxxxxxxxx > Cc: adrian.hunter@xxxxxxxxx > Cc: kan.liang@xxxxxxxxx > Cc: markus.t.metzger@xxxxxxxxx > Cc: mathieu.poirier@xxxxxxxxxx > > Signed-off-by: Vince Weaver <vincent.weaver@xxxxxxxxx> > > 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 > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
