From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752588AbbJNG33 (ORCPT ); Wed, 14 Oct 2015 02:29:29 -0400 Received: from mail-wi0-f178.google.com ([209.85.212.178]:32918 "EHLO mail-wi0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751322AbbJNG31 (ORCPT ); Wed, 14 Oct 2015 02:29:27 -0400 Message-ID: <561DF644.4030703@gmail.com> Date: Wed, 14 Oct 2015 08:29:24 +0200 From: "Michael Kerrisk (man-pages)" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 MIME-Version: 1.0 To: Vince Weaver CC: mtk.manpages@gmail.com, linux-man@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Stephane Eranian , Alexander Shishkin , Borislav Petkov , Frederic Weisbecker , "H. Peter Anvin" , Kaixu Xia , Linus Torvalds , Mike Galbraith , Robert Richter , Thomas Gleixner , adrian.hunter@intel.com, kan.liang@intel.com, markus.t.metzger@intel.com, mathieu.poirier@linaro.org Subject: Re: [patch 04/11] perf_event_open.2: 4.1 data_offset and data_size fields References: In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > > perf: Add data_{offset,size} to user_page > > Signed-off-by: Alexander Shishkin > Signed-off-by: Peter Zijlstra (Intel) > Cc: Borislav Petkov > Cc: Frederic Weisbecker > Cc: H. Peter Anvin > Cc: Kaixu Xia > Cc: Linus Torvalds > Cc: Mike Galbraith > Cc: Paul Mackerras > Cc: Robert Richter > Cc: Stephane Eranian > Cc: Thomas Gleixner > Cc: acme@infradead.org > Cc: adrian.hunter@intel.com > Cc: kan.liang@intel.com > Cc: markus.t.metzger@intel.com > Cc: mathieu.poirier@linaro.org > Link: http://lkml.kernel.org/r/1421237903-181015-2-git-send-email-alexander.shishkin@linux.intel.com > Signed-off-by: Ingo Molnar > > > Signed-off-by: Vince Weaver > > 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/