Messages in this thread | | | Subject | Re: [PATCH 1/2] perf tools: Add reference timestamp to perf header | From | Peter Zijlstra <> | Date | Mon, 13 Dec 2010 19:06:13 +0100 |
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On Mon, 2010-12-13 at 11:01 -0700, David S. Ahern wrote: > > Another problem with this approach is things like flight-recorder mode > > where you constantly over-write your old data, you'd have to build some > > trigger to always output a new record before you over-write the old one, > > so there's always one consistent record around. Drift is an even more > > serious problem here since flight-record more could be running for days > > before (if ever) you dump it. > > Ok. I was not aware flight-recorder mode was an option today.
You get it when you mmap the fd RO -- the only thing is you don't get a consistent tail pointer so you have to fudge a bit.
But even if we didn't have it, we'd need a solution that would work once we did grow it ;-)
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