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Message-ID: <alpine.DEB.0.9999.0710261344180.6249@chino.kir.corp.google.com> Date: Fri, 26 Oct 2007 13:45:48 -0700 (PDT) From: David Rientjes <rientjes@...gle.com> To: Paul Jackson <pj@....com> cc: Lee.Schermerhorn@...com, clameter@....com, akpm@...ux-foundation.org, ak@...e.de, linux-kernel@...r.kernel.org Subject: Re: [patch 2/2] cpusets: add interleave_over_allowed option On Fri, 26 Oct 2007, Paul Jackson wrote: > Without at least this sort of change to MPOL_INTERLEAVE nodemasks, > allowing either empty nodemasks (Lee's proposal) or extending them > outside the current cpuset (what I'm cooking up now), there is no way > for a task that is currently confined to a single node cpuset to say > anything about how it wants be interleaved in the event that it is > subsequently moved to a larger cpuset. Currently, such a task is only > allowed to pass exactly one particular nodemask to set_mempolicy > MPOL_INTERLEAVE calls, with exactly the one bit corresponding to its > current node. No useful information can be passed via an API that only > allows a single legal value. > Well, passing a single node to set_mempolicy() for MPOL_INTERLEAVE doesn't make a whole lot of sense in the first place. I prefer your solution of allowing set_mempolicy(MPOL_INTERLEAVE, NODE_MASK_ALL) to mean "interleave me over everything I'm allowed to access." NODE_MASK_ALL would be stored in the struct mempolicy and used later on mpol_rebind_policy(). David - 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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