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Message-ID: <alpine.DEB.0.9999.0710261416160.11594@chino.kir.corp.google.com> Date: Fri, 26 Oct 2007 14:18:55 -0700 (PDT) From: David Rientjes <rientjes@...gle.com> To: Lee Schermerhorn <Lee.Schermerhorn@...com> cc: Paul Jackson <pj@....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, Lee Schermerhorn wrote: > You don't need to save the entire mask--just note that NODE_MASK_ALL was > passed--like with my internal MPOL_CONTEXT flag. This would involve > special casing NODE_MASK_ALL in the error checking, as currently > set_mempolicy() complains loudly if you pass non-allowed nodes--see > "contextualize_policy()". [mbind() on the other hand, appears to allow > any nodemask, even outside the cpuset. guess we catch this during > allocation.] This is pretty much the spirit of my patch w/o the API > change/extension [/improvement :)] > Not really, because perhaps your application doesn't want to interleave over all nodes. I suggested NODE_MASK_ALL as the way to get access to all the memory you are allowed, but it's certainly plausible that an application could request to interleave only over a subset. That's the entire reason set_mempolicy(MPOL_INTERLEAVE) takes a nodemask anyway right now instead of just using task->mems_allowed on each allocation. 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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