Messages in this thread | | | Date | Mon, 11 May 2009 15:32:01 +0200 | From | Brice Goglin <> | Subject | Re: [RFC PATCH 0/4]: affinity-on-next-touch |
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Andi Kleen wrote: > Stefan Lankes <lankes@lfbs.rwth-aachen.de> writes: > >> [Patch 1/4]: Extend the system call madvise with a new parameter >> MADV_ACCESS_LWP (the same as used in Solaris). The specified memory area >> > > Linux does NUMA memory policies in mbind(), not madvise() > Also if there's a new NUMA policy it should be in the standard > Linux NUMA memory policy frame work, not inventing a new one >
Marking a buffer as "migrate-on-next-touch" is very different from setting a NUMA policy. Migrate-on-next-touch a temporary flag that is cleared on the next-touch. It's cleared per page, not per area or whatever. So marking a VMA as "migrate-on-next-touch" doesn't make much sense since some pages could already have been migrated (and brought back to their usual state) while some other are still marked as migrate-on-next-touch.
Brice
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