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Message-ID: <87y54kvz87.fsf@tassilo.jf.intel.com> Date: Tue, 19 Nov 2013 13:49:28 -0800 From: Andi Kleen <andi@...stfloor.org> To: Michal Hocko <mhocko@...e.cz> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] Expose sysctls for enabling slab/file_cache interleaving Michal Hocko <mhocko@...e.cz> writes: > > Another option would be to use sysctl values for the top cpuset as a > default. But then why not just do it manually without sysctl? I want to provide an alternative to having to use cpusets to use this, that is actually usable for normal people. Also this is really a global setting in my mind. > If you create a cpuset and explicitly disable spreading then you would > be quite surprised that your process gets pages from all nodes, no? If I enable it globally using a sysctl I would be quite surprised if some cpuset can override it. That argument is equally valid :-) The user configured an inconsistent configuration, and the kernel has to make a decision somehow. In the end it is arbitary, but not having to check the cpuset here is a lot cheaper, so I prefer the "sysctl has priority" option. Could EINVAL the cpuset setting when the sysctl is set though (but it's difficult to do the other way round). -Andi -- ak@...ux.intel.com -- Speaking for myself only -- 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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