Re: [patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U4

From: Adam Heath (doogie_at_debian.org)
Date: 10/16/04

  • Next message: Måns Rullgård: "Re: High pitched noise from laptop: processor.c in linux 2.6" 
    Date:	Sat, 16 Oct 2004 14:59:36 -0500 (CDT)
To: Ingo Molnar <mingo@elte.hu>

    On Sat, 16 Oct 2004, Ingo Molnar wrote:

    >
    > * Adam Heath <doogie@debian.org> wrote:
    >
    > > > i have released the -U4 PREEMPT_REALTIME patch:
    > > >
    > > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc4-mm1-U4
    > > >
    > > > this is a fixes-only release, and it is still experimental code.
    > >
    > > Few stack dumps now.
    >
    > these are normal, they are the PREEMPT_TIMING traces which get printed
    > every time the kernel measures a new latency maximum. The stack dumps
    > are done to make it easier to identify which place too that long of a
    > delay and why. (if LATENCY_TRACE is enabled too then the last latency
    > and its trace can also be found in /proc/latency_trace.)
    >
    > after bootup it makes sense to reset the maximum:
    >
    > echo 10 > /proc/sys/kernel/preempt_max_latency
    >
    > because during bootup there are a number of latencies that are one-time
    > only.

    So, I did that, and immediately started getting more stack dumps. Are these
    things that are interesting, or only informational?
    -
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