lkml.org 
[lkml]   [2011]   [Mar]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 3/6] perf record: add time-of-day option
From
Date
On Tue, 2011-03-01 at 07:35 -0700, David Ahern wrote:
>
> 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(&regs);
> >> + event->pmu->read(event);
> >> + perf_sample_data_init(&data, 0);
> >> + data.period = event->hw.last_period;
> >> + perf_event_output(event, 0, &data, &regs);
> >> +
> >> + 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.

Again, why?



\
 
 \ /
  Last update: 2011-03-01 16:35    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site