Messages in this thread | | | Date | Thu, 25 Mar 2004 20:09:45 +0100 | From | Ingo Molnar <> | Subject | Re: [Lse-tech] [patch] sched-domain cleanups, sched-2.6.5-rc2-mm2-A3 |
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* 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.
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