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    [W:0.025 / U:30.268 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site