[PATCH V2 2/4] perf/x86: introduce read function for x86_pmu

From: kan . liang
Date: Wed Dec 20 2017 - 14:44:48 EST


From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>

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

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

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 140d332..acd7ffc 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1884,6 +1884,8 @@ 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);
}

diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index f7aaadf..67426e51 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