Messages in this thread | | | Subject | Re: [Lse-tech] Re: [patch] scheduler fix for 1cpu/node case | From | Mala Anand <> | Date | Tue, 29 Jul 2003 11:04:24 -0500 |
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>Are the balances you're doing on wakeup global or node-local? The test is not done on NUMA systems.
Regards, Mala
Mala Anand IBM Linux Technology Center - Kernel Performance E-mail:manand@us.ibm.com http://www-124.ibm.com/developerworks/opensource/linuxperf http://www-124.ibm.com/developerworks/projects/linuxperf Phone:838-8088; Tie-line:678-8088
"Martin J. Bligh" <mbligh@aracnet.com> To: Mala Anand/Austin/IBM@IBMUS, Erich Focht <efocht@hpce.nec.com>, linux-kernel Sent by: <linux-kernel@vger.kernel.org>, LSE <lse-tech@lists.sourceforge.net> lse-tech-admin@lists.sour cc: Andi Kleen <ak@muc.de>, torvalds@osdl.org ceforge.net Subject: Re: [Lse-tech] Re: [patch] scheduler fix for 1cpu/node case 07/29/2003 09:29 AM
>>> If you want data supporting my assumptions: Ted Ts'o's talk at OLS >>> shows the necessity to rebalance ASAP (even in try_to_wake_up). > >> If this is the patch I am thinking of, it was the (attached) one I sent > them, >> which did a light "push" rebalance at try_to_wake_up. Calling > load_balance >> at try_to_wake_up seems very heavy-weight. This patch only looks for an > idle >> cpu (within the same node) to wake up on before task activation, only if > the >> task_rq(p)->nr_running is too long. So, yes, I do believe this can be >> important, but I think it's only called for when we have an idle cpu. > > The patch that you sent to Rajan didn't yield any improvement on > specjappserver so we did not include that in the ols paper. What > is described in the ols paper is "calling load-balance" from > try-to-wake-up. Both calling load-balance from try-to-wakeup and > the "light push" rebalance at try_to_wake_up are already done in > Andrea's 0(1) scheduler patch.
Are the balances you're doing on wakeup global or node-local?
M.
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