From bcfbe5c41d630ce6b74da45134cea484248b515a Mon Sep 17 00:00:00 2001 From: Kan Liang Date: Mon, 12 Feb 2018 14:20:32 -0800 Subject: [PATCH] perf/x86: Introduce a ->read() callback in 'struct x86_pmu' Auto-reload needs to be specially handled when reading event counts. Signed-off-by: Kan Liang Signed-off-by: Peter Zijlstra (Intel) Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Cc: acme@kernel.org Link: http://lkml.kernel.org/r/1518474035-21006-3-git-send-email-kan.liang@linux.intel.com Signed-off-by: Ingo Molnar --- 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 5a3ccd1715e2..00a6251981d2 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -1881,6 +1881,8 @@ 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 6495ffd57e3e..d445f0026989 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -520,6 +520,7 @@ 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; -- 2.20.1