From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Subject: Re: [PATCH 3/6] perf record: add time-of-day option Date: Tue, 01 Mar 2011 07:35:36 -0700 Message-ID: <4D6D0438.2090901@cisco.com> References: <1298865151-23656-1-git-send-email-daahern@cisco.com> <1298865151-23656-4-git-send-email-daahern@cisco.com> <1298989751.5226.863.camel@laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from sj-iport-5.cisco.com ([171.68.10.87]:31355 "EHLO sj-iport-5.cisco.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753380Ab1CAOfV (ORCPT ); Tue, 1 Mar 2011 09:35:21 -0500 In-Reply-To: <1298989751.5226.863.camel@laptop> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Peter Zijlstra Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, acme@ghostprotocols.net, mingo@elte.hu, fweisbec@gmail.com, paulus@samba.org, tglx@linutronix.de On 03/01/2011 07:29 AM, Peter Zijlstra wrote: >> +/* add a sample to the event stream based on user request */ >> +static int perf_event_generate_sample(struct perf_event *event) >> +{ >> + struct perf_sample_data data; >> + struct pt_regs regs; >> + >> + perf_fetch_caller_regs(®s); >> + event->pmu->read(event); >> + perf_sample_data_init(&data, 0); >> + data.period = event->hw.last_period; >> + perf_event_output(event, 0, &data, ®s); >> + >> + return 0; >> +} > > I'm not quite sure why you need this.. > periodic samples are generated after the specified period. I want the first sample immediately and the remainder based on the set period. So generically, how do you get the first sample into the event stream and let the others happen based on the timer? I need not only the counter value but also the perf_clock timestamp that comes from the SAMPLE_TIME attribute. David