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Message-Id: <1517243373-355481-3-git-send-email-kan.liang@linux.intel.com>
Date: Mon, 29 Jan 2018 08:29:30 -0800
From: kan.liang@...ux.intel.com
To: peterz@...radead.org, mingo@...hat.com,
linux-kernel@...r.kernel.org
Cc: acme@...nel.org, tglx@...utronix.de, jolsa@...hat.com,
eranian@...gle.com, ak@...ux.intel.com,
Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH V3 2/5] perf/x86: introduce read function for x86_pmu
From: Kan Liang <kan.liang@...ux.intel.com>
Large PEBS needs to be specially handled in event count read.
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
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 8e4ea143..805400b 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -519,6 +519,7 @@ 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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