From: Alexander Shishkin <alexander.shishkin@linux.intel.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, vince@deater.net,
eranian@google.com, Arnaldo Carvalho de Melo <acme@infradead.org>,
tglx@linutronix.de,
Alexander Shishkin <alexander.shishkin@linux.intel.com>
Subject: [PATCH 2/2] perf: Limit matching exclusive events to one PMU
Date: Tue, 20 Sep 2016 18:48:11 +0300
Message-ID: <20160920154811.3255-3-alexander.shishkin@linux.intel.com> (raw)
In-Reply-To: <20160920154811.3255-1-alexander.shishkin@linux.intel.com>
An "exclusive" PMU is the one that can only have one event scheduled in
at any given time. There may be more than one of such PMUs in a system,
though, like Intel PT and BTS. It should be allowed to have one event
for either of those inside the same context (there may be other constraints
that may prevent this, but those would be hardware-specific). However,
the exclusivity code is written so that only one event from any of the
"exclusive" PMUs is allowed in a context.
Fix this by making the exclusive event filter explicitly match two events'
PMUs.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
---
kernel/events/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index fedba316cc..7c0d263f6b 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3958,7 +3958,7 @@ static void exclusive_event_destroy(struct perf_event *event)
static bool exclusive_event_match(struct perf_event *e1, struct perf_event *e2)
{
- if ((e1->pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE) &&
+ if ((e1->pmu == e2->pmu) &&
(e1->cpu == e2->cpu ||
e1->cpu == -1 ||
e2->cpu == -1))
--
2.9.3
next prev parent reply index
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-20 15:48 [PATCH 0/2] perf, bts: Make BTS exclusive again Alexander Shishkin
2016-09-20 15:48 ` [PATCH 1/2] perf/x86/intel/bts: Make it an exclusive PMU Alexander Shishkin
2016-09-22 14:00 ` [tip:perf/urgent] " tip-bot for Alexander Shishkin
2016-09-20 15:48 ` Alexander Shishkin [this message]
2016-09-22 14:01 ` [tip:perf/urgent] perf/core: Limit matching exclusive events to one PMU tip-bot for Alexander Shishkin
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