linux-kernel - [PATCH 3/9] perf/x86: add 3 new scheduling callbacks

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Date:	Wed,  4 Jun 2014 23:34:12 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	linux-kernel@...r.kernel.org
Cc:	peterz@...radead.org, mingo@...e.hu, ak@...ux.intel.com,
	jolsa@...hat.com, zheng.z.yan@...el.com,
	maria.n.dimakopoulou@...il.com
Subject: [PATCH 3/9] perf/x86: add 3 new scheduling callbacks

From: Maria Dimakopoulou <maria.n.dimakopoulou@...il.com>

This patch adds 3 new PMU model specific callbacks
during the event scheduling done by x86_schedule_events().

- start_scheduling: invoked when entering the schedule routine.
- stop_scheduling: invoked at the end of the schedule routine
- commit_scheduling: invoked for each committed event

To be used optionally by model-specific code.

Reviewed-by: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Maria Dimakopoulou <maria.n.dimakopoulou@...il.com>
---
 arch/x86/kernel/cpu/perf_event.c |    9 +++++++++
 arch/x86/kernel/cpu/perf_event.h |    8 ++++++++
 2 files changed, 17 insertions(+)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 36fb4fc..858a72a 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -733,6 +733,9 @@ int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign)
 
 	bitmap_zero(used_mask, X86_PMC_IDX_MAX);
 
+	if (x86_pmu.start_scheduling)
+		x86_pmu.start_scheduling(cpuc);
+
 	for (i = 0, wmin = X86_PMC_IDX_MAX, wmax = 0; i < n; i++) {
 		hwc = &cpuc->event_list[i]->hw;
 		c = x86_pmu.get_event_constraints(cpuc, cpuc->event_list[i]);
@@ -779,6 +782,8 @@ int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign)
 		for (i = 0; i < n; i++) {
 			e = cpuc->event_list[i];
 			e->hw.flags |= PERF_X86_EVENT_COMMITTED;
+			if (x86_pmu.commit_scheduling)
+				x86_pmu.commit_scheduling(cpuc, e, assign[i]);
 		}
 	}
 	/*
@@ -799,6 +804,10 @@ int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign)
 				x86_pmu.put_event_constraints(cpuc, e);
 		}
 	}
+
+	if (x86_pmu.stop_scheduling)
+		x86_pmu.stop_scheduling(cpuc);
+
 	return num ? -EINVAL : 0;
 }
 
diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h
index 1cab1c2..413799f 100644
--- a/arch/x86/kernel/cpu/perf_event.h
+++ b/arch/x86/kernel/cpu/perf_event.h
@@ -409,6 +409,14 @@ struct x86_pmu {
 
 	void		(*put_event_constraints)(struct cpu_hw_events *cpuc,
 						 struct perf_event *event);
+
+	void		(*commit_scheduling)(struct cpu_hw_events *cpuc,
+					     struct perf_event *event, int cntr);
+
+	void		(*start_scheduling)(struct cpu_hw_events *cpuc);
+
+	void		(*stop_scheduling)(struct cpu_hw_events *cpuc);
+
 	struct event_constraint *event_constraints;
 	struct x86_pmu_quirk *quirks;
 	int		perfctr_second_write;
-- 
1.7.9.5

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