aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorDeng-Cheng Zhu <dengcheng.zhu@gmail.com>2011-01-21 08:19:19 (GMT)
committerRalf Baechle <ralf@linux-mips.org>2011-03-14 20:07:27 (GMT)
commitc049b6a5f2d8ca16094a4f2a6d8ad39f888a551a (patch)
tree16947cc5f9e688534f9cf265d1a62118532e394e
parent404ff638403e9286691b9b1f86d514c1d7737e8f (diff)
MIPS, Perf-events: Fix event check in validate_event()
Ignore events that are in off/error state or belong to a different PMU. This patch originates from the following commit for ARM by Will Deacon: - 65b4711ff513767341aa1915c822de6ec0de65cb ARM: 6352/1: perf: fix event validation The validate_event function in the ARM perf events backend has the following problems: 1.) Events that are disabled count towards the cost. 2.) Events associated with other PMUs [for example, software events or breakpoints] do not count towards the cost, but do fail validation, causing the group to fail. This patch changes validate_event so that it ignores events in the PERF_EVENT_STATE_OFF state or that are scheduled for other PMUs. Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com> To: a.p.zijlstra@chello.nl To: fweisbec@gmail.com To: will.deacon@arm.com Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Cc: wuzhangjin@gmail.com Cc: paulus@samba.org Cc: mingo@elte.hu Cc: acme@redhat.com Cc: dengcheng.zhu@gmail.com Cc: matt@console-pimps.org Cc: sshtylyov@mvista.com Cc: ddaney@caviumnetworks.com Patchwork: http://patchwork.linux-mips.org/patch/2013/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/kernel/perf_event.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/mips/kernel/perf_event.c b/arch/mips/kernel/perf_event.c
index 1ee44a3..3d557611 100644
--- a/arch/mips/kernel/perf_event.c
+++ b/arch/mips/kernel/perf_event.c
@@ -486,8 +486,9 @@ static int validate_event(struct cpu_hw_events *cpuc,
{
struct hw_perf_event fake_hwc = event->hw;
- if (event->pmu && event->pmu != &pmu)
- return 0;
+ /* Allow mixed event group. So return 1 to pass validation. */
+ if (event->pmu != &pmu || event->state <= PERF_EVENT_STATE_OFF)
+ return 1;
return mipspmu->alloc_counter(cpuc, &fake_hwc) >= 0;
}

Privacy Policy