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    Subject[PATCH V2 2/4] 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 | 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
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