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Date: Sun, 21 Oct 2012 15:43:41 +0200 From: Ingo Molnar <mingo@...nel.org> To: Rik van Riel <riel@...hat.com> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, mingo@...hat.com, linux-kernel@...r.kernel.org, aarcange@...hat.com, Michel Lespinasse <walken@...gle.com> Subject: Re: [PATCH 4/2] numa, mm: Rename the PROT_NONE fault handling functions * Ingo Molnar <mingo@...nel.org> wrote: > > Michel indicated that he does not use PROT_NONE for his > > working set estimation code, but instead checks the accessed > > bits in the page tables. > > The pte_young() WSS method has a couple of fundamental > limitations: > > - it doesn't work with shared memory very well, the pte is per > mapping, not per page. The PROT_NONE method instruments the > physical page in essence. > > - it does not tell us which task touched the pte, in a > multi-threaded program > > So like Peter I'd too expect these new WSS methods to eventually > be picked up for any serious WSS work. Nevertheless lets wait and see until it actually happens - and meanwhile the prot_none namings are confusing. So I've applied your patch as-is, with two more (new) usage sites converted as well. Will push it out after a bit of testing. Thanks, Ingo -- 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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