linux-kernel - Re: [PATCH RFC/TEST] sched: make sync affine wakeups work

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Message-ID: <536943C9.4030502@redhat.com>
Date:	Tue, 06 May 2014 16:19:21 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Mike Galbraith <umgwanakikbuti@...il.com>,
	linux-kernel@...r.kernel.org, morten.rasmussen@....com,
	mingo@...nel.org, george.mccollister@...il.com,
	ktkhai@...allels.com
Subject: Re: [PATCH RFC/TEST] sched: make sync affine wakeups work

On 05/06/2014 07:54 AM, Peter Zijlstra wrote:
> On Fri, May 02, 2014 at 11:19:47AM -0400, Rik van Riel wrote:
>> As an aside, it also looks like SD_BALANCE_WAKE is set on all domains
>> of a NUMA system by default, so even the non-affine wakeup will end
>> up looking for the lowest load NUMA node to start up on.
> 
> I can't find it being set on anything by default.

                .flags                  = 1*SD_LOAD_BALANCE
                                        | 1*SD_BALANCE_NEWIDLE
                                        | 0*SD_BALANCE_EXEC
                                        | 0*SD_BALANCE_FORK
                                        | 0*SD_BALANCE_WAKE
                                        | 0*SD_WAKE_AFFINE
                                        | 0*SD_SHARE_CPUPOWER
                                        | 0*SD_SHARE_PKG_RESOURCES
                                        | 1*SD_SERIALIZE
                                        | 0*SD_PREFER_SIBLING
                                        | 1*SD_NUMA
                                        | sd_local_flags(level)


static inline int sd_local_flags(int level)
{
        if (sched_domains_numa_distance[level] > RECLAIM_DISTANCE)
                return 0;

        return SD_BALANCE_EXEC | SD_BALANCE_FORK | SD_WAKE_AFFINE;
}

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