Re: [PATCH 1/2] perf tools: Add reference timestamp to perf header

[David S. Ahern]

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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