Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754690AbbDPSKO (ORCPT ); Thu, 16 Apr 2015 14:10:14 -0400 Received: from mail-qk0-f173.google.com ([209.85.220.173]:36784 "EHLO mail-qk0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754619AbbDPSJy (ORCPT ); Thu, 16 Apr 2015 14:09:54 -0400 From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Thu, 16 Apr 2015 14:14:52 -0400 (EDT) To: "Michael Kerrisk (man-pages)" cc: linux-man@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra , Paul Mackerras , 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: [patch 04/10] perf_event_open.2: 4.1 data_offset and data_size fields Message-ID: User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2533 Lines: 69 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: 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 01ee579..8bd37da 100644 --- a/man2/perf_event_open.2 +++ b/man2/perf_event_open.2 @@ -1348,6 +1348,9 @@ 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 @@ -1564,6 +1567,16 @@ 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/