linux-kernel - Re: [patch 07/11] perf_event_open.2: 4.1 add AUX_FLAG

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Message-ID: <561DF746.3090403@gmail.com>
Date:	Wed, 14 Oct 2015 08:33:42 +0200
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Vince Weaver <vincent.weaver@...ne.edu>
CC:	mtk.manpages@...il.com, linux-man@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Kaixu Xia <kaixu.xia@...aro.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Robert Richter <rric@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>, adrian.hunter@...el.com,
	kan.liang@...el.com, markus.t.metzger@...el.com,
	mathieu.poirier@...aro.org
Subject: Re: [patch 07/11] perf_event_open.2: 4.1 add AUX_FLAG_OVERWRITE support

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@...ux.intel.com>
> 
> 	perf: Support overwrite mode for the AUX area
> 
> 	Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> 	Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> 	Cc: Borislav Petkov <bp@...en8.de>
> 	Cc: Frederic Weisbecker <fweisbec@...il.com>
> 	Cc: H. Peter Anvin <hpa@...or.com>
> 	Cc: Kaixu Xia <kaixu.xia@...aro.org>
> 	Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> 	Cc: Mike Galbraith <efault@....de>
> 	Cc: Paul Mackerras <paulus@...ba.org>
> 	Cc: Robert Richter <rric@...nel.org>
> 	Cc: Stephane Eranian <eranian@...gle.com>
> 	Cc: Thomas Gleixner <tglx@...utronix.de>
> 	Cc: acme@...radead.org
> 	Cc: adrian.hunter@...el.com
> 	Cc: kan.liang@...el.com
> 	Cc: markus.t.metzger@...el.com
> 	Cc: mathieu.poirier@...aro.org
> 	Link: http://lkml.kernel.org/r/1421237903-181015-9-git-send-email-alexander.shishkin@linux.intel.com
> 	Signed-off-by: Ingo Molnar <mingo@...nel.org>
> 
> Signed-off-by: Vince Weaver <vincent.weaver@...ne.edu>
> 
> 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/
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