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

Stephane Eranian
2014-06-04T21:44:06Z

From: Maria Dimakopoulou <maria.n.dimakopoulou@gmail.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@google.com>
Signed-off-by: Maria Dimakopoulou <maria.n.dimakopoulou@gmail.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