From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH v2 03/11] perf: export perf_event_refresh() to modules Date: Mon, 13 Jun 2011 16:34:58 +0300 Message-ID: <1307972106-2468-4-git-send-email-avi@redhat.com> References: <1307972106-2468-1-git-send-email-avi@redhat.com> Cc: Ingo Molnar , Peter Zijlstra , Arnaldo Carvalho de Melo To: Marcelo Tosatti , kvm@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:17114 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752961Ab1FMNf1 (ORCPT ); Mon, 13 Jun 2011 09:35:27 -0400 In-Reply-To: <1307972106-2468-1-git-send-email-avi@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: KVM needs one-shot samples, since a PMC programmed to -X will fire after X events and then again after 2^40 events (i.e. variable period). Signed-off-by: Avi Kivity --- include/linux/perf_event.h | 5 +++++ kernel/events/core.c | 3 ++- 2 files changed, 7 insertions(+), 1 deletions(-) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 40264b5..91342ac 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -973,6 +973,7 @@ extern void perf_pmu_disable(struct pmu *pmu); extern void perf_pmu_enable(struct pmu *pmu); extern int perf_event_task_disable(void); extern int perf_event_task_enable(void); +extern int perf_event_refresh(struct perf_event *event, int refresh); extern void perf_event_update_userpage(struct perf_event *event); extern int perf_event_release_kernel(struct perf_event *event); extern struct perf_event * @@ -1168,6 +1169,10 @@ static inline void perf_event_delayed_put(struct task_struct *task) { } static inline void perf_event_print_debug(void) { } static inline int perf_event_task_disable(void) { return -EINVAL; } static inline int perf_event_task_enable(void) { return -EINVAL; } +static inline int perf_event_refresh(struct perf_event *event, int refresh) +{ + return -EINVAL; +} static inline void perf_sw_event(u32 event_id, u64 nr, int nmi, diff --git a/kernel/events/core.c b/kernel/events/core.c index 6dd4819..f69cc9f 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -1739,7 +1739,7 @@ out: raw_spin_unlock_irq(&ctx->lock); } -static int perf_event_refresh(struct perf_event *event, int refresh) +int perf_event_refresh(struct perf_event *event, int refresh) { /* * not supported on inherited events @@ -1752,6 +1752,7 @@ static int perf_event_refresh(struct perf_event *event, int refresh) return 0; } +EXPORT_SYMBOL_GPL(perf_event_refresh); static void ctx_sched_out(struct perf_event_context *ctx, struct perf_cpu_context *cpuctx, -- 1.7.5.3