Messages in this thread | | | Date | Mon, 13 Dec 2010 10:49:38 -0700 | From | "David S. Ahern" <> | Subject | Re: [PATCH 1/2] perf tools: Add reference timestamp to perf header |
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On 12/13/10 10:47, Peter Zijlstra wrote: > On Mon, 2010-12-13 at 18:35 +0100, Peter Zijlstra wrote: >> * this CLOCK_MONOTONIC offset (for what little good that does, since >> our clock isn't strictly sync'ed to CLOCK_MONOTONIC so we can incur >> arbitrary drift). > > In fact, the only sane way to do that is by creating a software counter > that represents CLOCK_MONOTONIC and sample that say once a minute (or > more often if you want smaller drift). > >
What about creating a PERF_RECORD_TIME and generate an event when the counter is opened? It contains a PERF_SAMPLE_TIME and say PERF_SAMPLE_TOD (time-of-day)? We're not sending rockets to saturn; we just need the timestamps to match other log files.
David
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