linux-kernel - Re: [patch 04/11] perf_event_open.2: 4.1 data_offset and data

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Date:	Wed, 14 Oct 2015 08:29:24 +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 04/11] perf_event_open.2: 4.1 data_offset and data_size
 fields

On 07/23/2015 07:11 PM, Vince Weaver wrote:
> 
> This manpage patch relates to the addition of the data_offset
> and data_size fields to the perf_event mmap buffer, as added
> in the following commit:

Thanks, Vince. Applied.

Cheers,

Michael



> 	commit e8c6deac69629c0cb97c3d3272f8631ef17f8f0f
> 	Author: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> 
> 	perf: Add data_{offset,size} to user_page
> 
> 	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/1421237903-181015-2-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 09eda9a..a3bebaa 100644
> --- a/man2/perf_event_open.2
> +++ b/man2/perf_event_open.2
> @@ -1414,6 +1414,9 @@ struct perf_event_mmap_page {
>      __u64 __reserved[120];   /* Pad to 1k */
>      __u64 data_head;         /* head in the data section */
>      __u64 data_tail;         /* user-space written tail */
> +    __u64 data_offset;       /* where the buffer starts */
> +    __u64 data_size;         /* data buffer size */
> +
>  }
>  .fi
>  .in
> @@ -1630,6 +1633,16 @@ the
>  .I data_tail
>  value should be written by user space to reflect the last read data.
>  In this case, the kernel will not overwrite unread data.
> +.TP
> +.IR data_offset " (since Linux 4.1)"
> +.\" commit e8c6deac69629c0cb97c3d3272f8631ef17f8f0f
> +Contains the offset of the location in the mmap buffer
> +where perf sample data begins.
> +.TP
> +.IR data_size " (since Linux 4.1)"
> +.\" commit e8c6deac69629c0cb97c3d3272f8631ef17f8f0f
> +Contains the size of the perf sample region within
> +the mmap buffer.
>  .PP
>  The following 2^n ring-buffer pages have the layout described below.
>  
> 


-- 
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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