Messages in this thread | | | Date | Tue, 23 Sep 2008 07:33:24 +0100 | From | Sitsofe Wheeler <> | Subject | Re: How how latent should non-preemptive scheduling be? |
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Ingo Molnar wrote: > well, since they went away after you enabled CONFIG_PREEMPT=y, they are > definitely in-kernel latencies, not any external SMM latencies. > > I.e. they are inherently fixable. Could you enable: > > CONFIG_DYNAMIC_FTRACE=y > CONFIG_FTRACE_MCOUNT_RECORD=y > > that should make the traces a lot more verbose - every kernel function > executed in the latency path will be logged. That way we'll be able to > say which one takes that long.
I do not appear to have the CONFIG_FTRACE_MCOUNT_RECORD option in 2.6.27rc7. Is it an option that is only in -tip ?
-- Sitsofe | http://sucs.org/~sits/
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