Re: [Lse-tech] [patch] sched-domain cleanups, sched-2.6.5-rc2-mm2-A3

From: Ingo Molnar (mingo_at_elte.hu)
Date: 03/25/04

  • Next message: Jamie Lokier: "Re: arch/i386/Kconfig: CONFIG_IRQBALANCE Description" 
    Date:	Thu, 25 Mar 2004 20:09:45 +0100
To: Andi Kleen <ak@suse.de>

    * Andi Kleen <ak@suse.de> wrote:

    > It doesn't do load balance in wake_up_forked_process() and is
    > relatively non aggressive in balancing later. This leads to the
    > multithreaded OpenMP STREAM running its childs first on the same node
    > as the original process and allocating memory there. [...]

    i believe the fix we want is to pre-balance the context at fork() time.
    I've implemented this (which is basically just a reuse of
    sched_balance_exec() in fork.c, and the related namespace cleanups),
    could you give it a go:

      http://redhat.com/~mingo/scheduler-patches/sched-2.6.5-rc2-mm2-A5

    another solution would be to add SD_BALANCE_FORK.

    also, the best place to do fork() blancing is not at
    wake_up_forked_process() time, but prior doing the MM copy. This patch
    does it there. At wakeup time we've already copied all the pagetables
    and created tons of dirty cachelines.

            Ingo
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  • Next message: Jamie Lokier: "Re: arch/i386/Kconfig: CONFIG_IRQBALANCE Description"

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