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Message-Id: <20071001111528.5487b4f4.pj@sgi.com> Date: Mon, 1 Oct 2007 11:15:28 -0700 From: Paul Jackson <pj@....com> To: Nick Piggin <nickpiggin@...oo.com.au> Cc: akpm@...ux-foundation.org, menage@...gle.com, linux-kernel@...r.kernel.org, dino@...ibm.com, cpw@....com, mingo@...e.hu Subject: Re: [PATCH] cpuset and sched domains: sched_load_balance flag Nick wrote: > which you could equally achieve by adding > a second set of sched domains (and the global domains could keep > globally balancing). Hmmm ... this could be the key to this discussion. Nick - can two sched domains overlap? And if they do, what does that mean on any user or application behaviour. >From the cpuset side - this patch handles overlap by joining the 'cpus' into one sched domain. If two cpusets with overlapping 'cpus' are both marked 'sched_load_balance', then this patch forms a single, combined sched domain. As best as I can tell, you and I are actually in agreement in the case that there is no overlap. If the several cpusets which have 'sched_load_balance' enabled have mutually disjoint 'cpus' (no overlap), then my patch forms exactly one sched domain for each such cpuset, having the same 'cpus'. The issue is the overlapping cases - are overlapping sched domains allowed, and if so, how do they affect user space? -- I won't rest till it's the best ... Programmer, Linux Scalability Paul Jackson <pj@....com> 1.925.600.0401 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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