[patch 07/11] perf_event_open.2: 4.1 add AUX_FLAG_OVERWRITE support

[patch 07/11] perf_event_open.2: 4.1 add AUX_FLAG_OVERWRITE support

[Vince Weaver]

This manpage patch relates to the addition of the AUX sample flag
AUX_FLAG_OVERWRITE as added in the following commit:

	commit 2023a0d2829e521fe6ad6b9907f3f90bfbf57142
	Author: Alexander Shishkin <alexander.shishkin-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

	perf: Support overwrite mode for the AUX area

	Signed-off-by: Alexander Shishkin <alexander.shishkin-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
	Signed-off-by: Peter Zijlstra (Intel) <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
	Cc: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
	Cc: Frederic Weisbecker <fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
	Cc: H. Peter Anvin <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
	Cc: Kaixu Xia <kaixu.xia-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
	Cc: Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
	Cc: Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org>
	Cc: Paul Mackerras <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
	Cc: Robert Richter <rric-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
	Cc: Stephane Eranian <eranian-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
	Cc: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
	Cc: acme-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org
	Cc: adrian.hunter-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
	Cc: kan.liang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
	Cc: markus.t.metzger-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
	Cc: mathieu.poirier-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org
	Link: http://lkml.kernel.org/r/1421237903-181015-9-git-send-email-alexander.shishkin-VuQAYsv1563Yd54FQh9/CA@public.gmane.org
	Signed-off-by: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>

Signed-off-by: Vince Weaver <vincent.weaver-e7X0jjDqjFGHXe+LvDLADg@public.gmane.org>

diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index dfb0b64..238eb62 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -1670,6 +1670,15 @@ rlimit as well as the
 .I perf_event_mlock_kb
 allowance.
 
+By default the AUX buffer will be truncated if it will not fit
+in the available space in the ring buffer.
+If the AUX buffer is mapped as a read only buffer, then it will
+operate in ring buffer mode where old data will be overwritten
+by new.
+In overwrite mode it might not be possible to infer where the
+new data began, and it is the consumer's job to disable
+measurement while reading to avoid possible data races.
+
 The
 .IR aux_head " and " aux_tail
 ring buffer pointers have the same behavior and ordering
@@ -2476,6 +2485,10 @@ describes the aux update.
 .B PERF_AUX_FLAG_TRUNCATED
 if set then the data returned was truncated to fit the available
 buffer size.
+.TP
+.B PERF_AUX_FLAG_OVERWRITE
+.\" commit 2023a0d2829e521fe6ad6b9907f3f90bfbf57142
+if set then the data returned has overwritten previous data.
 .RE
 .RE
 .RE
--
To unsubscribe from this list: send the line "unsubscribe linux-man" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [patch 07/11] perf_event_open.2: 4.1 add AUX_FLAG_OVERWRITE support

[Michael Kerrisk (man-pages)]

On 07/23/2015 07:13 PM, Vince Weaver wrote:
> 
> This manpage patch relates to the addition of the AUX sample flag
> AUX_FLAG_OVERWRITE as added in the following commit:

Thanks, Vince. Applied.

Cheers,

Michael



> 	commit 2023a0d2829e521fe6ad6b9907f3f90bfbf57142
> 	Author: Alexander Shishkin <alexander.shishkin-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> 
> 	perf: Support overwrite mode for the AUX area
> 
> 	Signed-off-by: Alexander Shishkin <alexander.shishkin-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> 	Signed-off-by: Peter Zijlstra (Intel) <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
> 	Cc: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
> 	Cc: Frederic Weisbecker <fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> 	Cc: H. Peter Anvin <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
> 	Cc: Kaixu Xia <kaixu.xia-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> 	Cc: Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
> 	Cc: Mike Galbraith <efault-Mmb7MZpHnFY@public.gmane.org>
> 	Cc: Paul Mackerras <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>
> 	Cc: Robert Richter <rric-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> 	Cc: Stephane Eranian <eranian-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
> 	Cc: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
> 	Cc: acme-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org
> 	Cc: adrian.hunter-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
> 	Cc: kan.liang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
> 	Cc: markus.t.metzger-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
> 	Cc: mathieu.poirier-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org
> 	Link: http://lkml.kernel.org/r/1421237903-181015-9-git-send-email-alexander.shishkin-VuQAYsv1563Yd54FQh9/CA@public.gmane.org
> 	Signed-off-by: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> 
> Signed-off-by: Vince Weaver <vincent.weaver-e7X0jjDqjFGHXe+LvDLADg@public.gmane.org>
> 
> diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
> index dfb0b64..238eb62 100644
> --- a/man2/perf_event_open.2
> +++ b/man2/perf_event_open.2
> @@ -1670,6 +1670,15 @@ rlimit as well as the
>  .I perf_event_mlock_kb
>  allowance.
>  
> +By default the AUX buffer will be truncated if it will not fit
> +in the available space in the ring buffer.
> +If the AUX buffer is mapped as a read only buffer, then it will
> +operate in ring buffer mode where old data will be overwritten
> +by new.
> +In overwrite mode it might not be possible to infer where the
> +new data began, and it is the consumer's job to disable
> +measurement while reading to avoid possible data races.
> +
>  The
>  .IR aux_head " and " aux_tail
>  ring buffer pointers have the same behavior and ordering
> @@ -2476,6 +2485,10 @@ describes the aux update.
>  .B PERF_AUX_FLAG_TRUNCATED
>  if set then the data returned was truncated to fit the available
>  buffer size.
> +.TP
> +.B PERF_AUX_FLAG_OVERWRITE
> +.\" commit 2023a0d2829e521fe6ad6b9907f3f90bfbf57142
> +if set then the data returned has overwritten previous data.
>  .RE
>  .RE
>  .RE
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
--
To unsubscribe from this list: send the line "unsubscribe linux-man" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html