Messages in this thread | | | Date | Mon, 13 Dec 2010 19:05:54 +0100 | From | Frederic Weisbecker <> | Subject | Re: [PATCH 1/2] perf tools: Add reference timestamp to perf header |
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On Mon, Dec 13, 2010 at 06:51:13PM +0100, Peter Zijlstra wrote: > On Mon, 2010-12-13 at 15:43 -0200, Arnaldo Carvalho de Melo wrote: > > Whatever, never introduced one, they are inserted, IIRC, in the > > beggining of the stream, so I guess we can just do that sed and call > > them headers and be done with it. > > There's the flush thing from Frederic, that's all over the place. > > The easiest way to kill that is to go to separate data files now. > writing to different files is better for contention anyway, we can grow > a flusher-thread per buffer and let them write to their own file.
Right. We need to go there in the end anyway. I had an old experiment of this some month ago:
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git perf/percpu
There is one writer per cpu and a (stupid) multiplexing at report time. It was working. Just the sorting on report time was (stupidly) slow.
I should perhaps rebase that branch and try to make something with it.
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