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Subject[PATCH 3/4] perf/x86: introduce read function for x86_pmu
Date
From: Kan Liang <kan.liang@linux.intel.com>

Large PEBS need to be specially handled in event count read.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
arch/x86/events/core.c | 3 +++
arch/x86/events/perf_event.h | 1 +
2 files changed, 4 insertions(+)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index f74e21d..c781497 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1899,6 +1899,9 @@ early_initcall(init_hw_perf_events);

static inline void x86_pmu_read(struct perf_event *event)
{
+ if (x86_pmu.read)
+ return x86_pmu.read(event);
+
x86_perf_event_update(event, 0, 0);
}

diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index fabb8b3..3a7a2e7 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -534,6 +534,7 @@ struct x86_pmu {
void (*disable)(struct perf_event *);
void (*add)(struct perf_event *);
void (*del)(struct perf_event *);
+ void (*read)(struct perf_event *event);
int (*hw_config)(struct perf_event *event);
int (*schedule_events)(struct cpu_hw_events *cpuc, int n, int *assign);
unsigned eventsel;
--
2.7.4
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