Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754534AbcC1KQ0 (ORCPT ); Mon, 28 Mar 2016 06:16:26 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:19965 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751854AbcC1KQY (ORCPT ); Mon, 28 Mar 2016 06:16:24 -0400 From: Wang Nan To: , , CC: , , , , Wang Nan Subject: [PATCH][manpages 1/2] perf_event_open.2: Document PERF_EVENT_IOC_PAUSE_OUTPUT Date: Mon, 28 Mar 2016 10:15:47 +0000 Message-ID: <1459160147-240738-1-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1459147292-239310-2-git-send-email-wangnan0@huawei.com> References: <1459147292-239310-2-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020206.56F90470.01A0,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 7496619878ca020f29ce201bf066ef79 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1031 Lines: 29 Signed-off-by: Wang Nan --- man2/perf_event_open.2 | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 index c90fc51..b232cba 100644 --- a/man2/perf_event_open.2 +++ b/man2/perf_event_open.2 @@ -2719,6 +2719,17 @@ The argument is a BPF program file descriptor that was created by a previous .BR bpf (2) system call. +.TP +.BR PERF_EVENT_IOC_PAUSE_OUTPUT " (since Linux 4.6)" +.\" commit ? (http://lkml.kernel.org/g/1459147292-239310-2-git-send-email-wangnan0@huawei.com) +This allows pausing and resuming the event's ring-buffer. A +paused ring-buffer does not prevent samples generation, but simply +discards them. The discarded samples are considered lost, causes +.BR PERF_RECORD_LOST +to be generated when possible. + +The argument is an integer. Nonzero value pauses the ring-buffer, +zero value resumes the ring-buffer. .SS Using prctl A process can enable or disable all the event groups that are attached to it using the -- 1.8.3.4