Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752001AbcJJFpY (ORCPT ); Mon, 10 Oct 2016 01:45:24 -0400 Received: from mail-lf0-f65.google.com ([209.85.215.65]:36647 "EHLO mail-lf0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751100AbcJJFpX (ORCPT ); Mon, 10 Oct 2016 01:45:23 -0400 From: Alexis Berlemont To: linux-kernel@vger.kernel.org Cc: Alexis Berlemont , peterz@infradead.org, mingo@redhat.com, acme@kernel.org, alexander.shishkin@linux.intel.com Subject: [PATCH] Implement --delay on perf trace Date: Mon, 10 Oct 2016 07:43:27 +0200 Message-Id: <20161010054328.4028-1-alexis.berlemont@gmail.com> X-Mailer: git-send-email 2.10.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1085 Lines: 36 Hi, In the perf wiki todo-list, there is an entry regarding initial-delay and perf trace; the following small patch tries to fulfill this point. It has been generated against the branch tip/perf/core. It has only been implemented in the "trace__run" case. Ex.: $ sudo strace -- ./perf trace --delay 5 sleep 1 2>&1 ... fcntl(7, F_SETFL, O_RDONLY|O_NONBLOCK) = 0 ioctl(7, PERF_EVENT_IOC_ID, 0x7ffc8fd35718) = 0 ioctl(11, PERF_EVENT_IOC_SET_OUTPUT, 0x7) = 0 fcntl(11, F_SETFL, O_RDONLY|O_NONBLOCK) = 0 ioctl(11, PERF_EVENT_IOC_ID, 0x7ffc8fd35718) = 0 write(6, "\0", 1) = 1 close(6) = 0 nanosleep({0, 5000000}, NULL) = 0 # DELAY OF 5 MS BEFORE ENABLING THE EVNTS ioctl(3, PERF_EVENT_IOC_ENABLE, 0) = 0 ioctl(4, PERF_EVENT_IOC_ENABLE, 0) = 0 ioctl(5, PERF_EVENT_IOC_ENABLE, 0) = 0 ioctl(7, PERF_EVENT_IOC_ENABLE, 0) = 0 ... Alexis. Alexis Berlemont (1): perf: implement --delay on perf trace tools/perf/builtin-trace.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) -- 2.10.0