From: Robert Bragg <robert@sixbynine.org> To: intel-gfx@lists.freedesktop.org Cc: Daniel Vetter <daniel.vetter@intel.com>, Jani Nikula <jani.nikula@linux.intel.com>, David Airlie <airlied@linux.ie>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@redhat.com>, Arnaldo Carvalho de Melo <acme@kernel.org>, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-api@vger.kernel.org Subject: [RFC PATCH 03/11] perf: Add PERF_EVENT_IOC_FLUSH ioctl Date: Thu, 7 May 2015 15:15:46 +0100 [thread overview] Message-ID: <1431008154-6833-4-git-send-email-robert@sixbynine.org> (raw) In-Reply-To: <1431008154-6833-1-git-send-email-robert@sixbynine.org> To allow for pmus that may have internal buffering (e.g. the hardware itself writes out data to its own circular buffer which is only periodically forwarded to userspace via perf) this ioctl enables userspace to explicitly ensure it has received all samples before a point in time. Signed-off-by: Robert Bragg <robert@sixbynine.org> --- include/linux/perf_event.h | 7 +++++++ include/uapi/linux/perf_event.h | 1 + kernel/events/core.c | 5 +++++ 3 files changed, 13 insertions(+) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 1af35b4..69a0cb9 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -266,6 +266,13 @@ struct pmu { * flush branch stack on context-switches (needed in cpu-wide mode) */ void (*flush_branch_stack) (void); + + /* + * Flush buffered samples (E.g. for pmu hardware that writes samples to + * some intermediate buffer) userspace may need to explicitly ensure + * such samples have been forwarded to perf. + */ + void (*flush) (struct perf_event *event); /*optional */ }; /** diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index 9b79abb..a25967b 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -360,6 +360,7 @@ struct perf_event_attr { #define PERF_EVENT_IOC_SET_OUTPUT _IO ('$', 5) #define PERF_EVENT_IOC_SET_FILTER _IOW('$', 6, char *) #define PERF_EVENT_IOC_ID _IOR('$', 7, __u64 *) +#define PERF_EVENT_IOC_FLUSH _IO ('$', 8) enum perf_event_ioc_flags { PERF_IOC_FLAG_GROUP = 1U << 0, diff --git a/kernel/events/core.c b/kernel/events/core.c index 7218b01..340deaa 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -3981,6 +3981,11 @@ static long _perf_ioctl(struct perf_event *event, unsigned int cmd, unsigned lon case PERF_EVENT_IOC_SET_FILTER: return perf_event_set_filter(event, (void __user *)arg); + case PERF_EVENT_IOC_FLUSH: + if (event->pmu->flush) + event->pmu->flush(event); + return 0; + default: return -ENOTTY; } -- 2.3.2
WARNING: multiple messages have this Message-ID (diff)
From: Robert Bragg <robert@sixbynine.org> To: intel-gfx@lists.freedesktop.org Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, David Airlie <airlied@linux.ie>, linux-api@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>, Paul Mackerras <paulus@samba.org>, Arnaldo Carvalho de Melo <acme@kernel.org>, Daniel Vetter <daniel.vetter@intel.com> Subject: [RFC PATCH 03/11] perf: Add PERF_EVENT_IOC_FLUSH ioctl Date: Thu, 7 May 2015 15:15:46 +0100 [thread overview] Message-ID: <1431008154-6833-4-git-send-email-robert@sixbynine.org> (raw) In-Reply-To: <1431008154-6833-1-git-send-email-robert@sixbynine.org> To allow for pmus that may have internal buffering (e.g. the hardware itself writes out data to its own circular buffer which is only periodically forwarded to userspace via perf) this ioctl enables userspace to explicitly ensure it has received all samples before a point in time. Signed-off-by: Robert Bragg <robert@sixbynine.org> --- include/linux/perf_event.h | 7 +++++++ include/uapi/linux/perf_event.h | 1 + kernel/events/core.c | 5 +++++ 3 files changed, 13 insertions(+) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 1af35b4..69a0cb9 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -266,6 +266,13 @@ struct pmu { * flush branch stack on context-switches (needed in cpu-wide mode) */ void (*flush_branch_stack) (void); + + /* + * Flush buffered samples (E.g. for pmu hardware that writes samples to + * some intermediate buffer) userspace may need to explicitly ensure + * such samples have been forwarded to perf. + */ + void (*flush) (struct perf_event *event); /*optional */ }; /** diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index 9b79abb..a25967b 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -360,6 +360,7 @@ struct perf_event_attr { #define PERF_EVENT_IOC_SET_OUTPUT _IO ('$', 5) #define PERF_EVENT_IOC_SET_FILTER _IOW('$', 6, char *) #define PERF_EVENT_IOC_ID _IOR('$', 7, __u64 *) +#define PERF_EVENT_IOC_FLUSH _IO ('$', 8) enum perf_event_ioc_flags { PERF_IOC_FLAG_GROUP = 1U << 0, diff --git a/kernel/events/core.c b/kernel/events/core.c index 7218b01..340deaa 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -3981,6 +3981,11 @@ static long _perf_ioctl(struct perf_event *event, unsigned int cmd, unsigned lon case PERF_EVENT_IOC_SET_FILTER: return perf_event_set_filter(event, (void __user *)arg); + case PERF_EVENT_IOC_FLUSH: + if (event->pmu->flush) + event->pmu->flush(event); + return 0; + default: return -ENOTTY; } -- 2.3.2 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
next prev parent reply other threads:[~2015-05-07 14:16 UTC|newest] Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-05-07 14:15 [RFC PATCH 00/11] drm/i915: Expose OA metrics via perf PMU Robert Bragg 2015-05-07 14:15 ` Robert Bragg 2015-05-07 14:15 ` [RFC PATCH 01/11] perf: export perf_event_overflow Robert Bragg 2015-05-07 14:15 ` Robert Bragg 2015-05-07 14:15 ` [RFC PATCH 02/11] perf: Add PERF_PMU_CAP_IS_DEVICE flag Robert Bragg 2015-05-07 14:15 ` Robert Bragg 2015-05-07 14:15 ` Robert Bragg [this message] 2015-05-07 14:15 ` [RFC PATCH 03/11] perf: Add PERF_EVENT_IOC_FLUSH ioctl Robert Bragg 2015-05-07 14:20 ` [Intel-gfx] " Chris Wilson 2015-05-07 14:20 ` Chris Wilson 2015-05-18 17:25 ` [RFC PATCH v2] " Robert Bragg 2015-05-18 17:25 ` Robert Bragg 2015-05-20 12:12 ` Ingo Molnar 2015-05-20 12:12 ` Ingo Molnar 2015-05-21 17:40 ` [RFC PATCH] perf: enable fsync to flush buffered samples Robert Bragg 2015-05-21 17:40 ` Robert Bragg 2015-05-07 14:15 ` [RFC PATCH 04/11] perf: Add a PERF_RECORD_DEVICE event type Robert Bragg 2015-05-07 14:15 ` Robert Bragg 2015-05-07 14:15 ` [RFC PATCH 05/11] perf: allow drivers more control over event logging Robert Bragg 2015-05-07 14:15 ` Robert Bragg 2015-05-07 14:15 ` [RFC PATCH 06/11] drm/i915: rename OACONTROL GEN7_OACONTROL Robert Bragg 2015-05-07 14:15 ` Robert Bragg 2015-05-07 14:15 ` [RFC PATCH 07/11] drm/i915: Expose PMU for Observation Architecture Robert Bragg 2015-05-07 14:15 ` Robert Bragg 2015-05-07 14:36 ` [Intel-gfx] " Chris Wilson 2015-05-07 14:36 ` Chris Wilson 2015-05-18 16:21 ` Robert Bragg 2015-05-07 14:58 ` [Intel-gfx] " Chris Wilson 2015-05-07 14:58 ` Chris Wilson 2015-05-18 16:36 ` Robert Bragg 2015-05-18 16:36 ` Robert Bragg 2015-05-18 17:17 ` [RFC PATCH v2] " Robert Bragg 2015-05-18 17:17 ` Robert Bragg 2015-05-18 17:21 ` [RFC PATCH] squash: be more careful stopping oacontrol updates Robert Bragg 2015-05-18 17:21 ` Robert Bragg 2015-05-07 14:15 ` [RFC PATCH 08/11] drm/i915: add OA config for 3D render counters Robert Bragg 2015-05-07 14:15 ` Robert Bragg 2015-05-07 14:15 ` [RFC PATCH 09/11] drm/i915: Add dev.i915.oa_event_paranoid sysctl option Robert Bragg 2015-05-07 14:15 ` Robert Bragg 2015-05-07 14:15 ` [RFC PATCH 10/11] drm/i915: report OA buf overrun + report lost status Robert Bragg 2015-05-07 14:15 ` Robert Bragg 2015-05-07 14:15 ` [RFC PATCH 11/11] WIP: drm/i915: constrain unit gating while using OA Robert Bragg 2015-05-07 14:15 ` Robert Bragg 2015-05-08 16:21 ` [RFC PATCH 00/11] drm/i915: Expose OA metrics via perf PMU Peter Zijlstra 2015-05-08 16:21 ` Peter Zijlstra 2015-05-18 17:29 ` Robert Bragg 2015-05-18 17:29 ` Robert Bragg 2015-05-08 16:24 ` Peter Zijlstra 2015-05-08 16:24 ` Peter Zijlstra 2015-05-15 1:07 ` Robert Bragg 2015-05-15 1:07 ` Robert Bragg 2015-05-19 14:53 ` Peter Zijlstra 2015-05-19 14:53 ` Peter Zijlstra 2015-05-20 23:17 ` Robert Bragg 2015-05-20 23:17 ` Robert Bragg 2015-05-21 8:24 ` [Intel-gfx] " Daniel Vetter 2015-05-21 8:24 ` Daniel Vetter 2015-05-27 15:39 ` Peter Zijlstra 2015-05-27 15:39 ` Peter Zijlstra 2015-05-27 16:41 ` Ingo Molnar 2015-05-27 16:41 ` Ingo Molnar 2015-06-04 18:53 ` [Intel-gfx] " Robert Bragg 2015-06-04 18:53 ` Robert Bragg
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