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Date: Wed, 28 Mar 2007 14:38:55 -0700 (PDT) From: Christoph Lameter <clameter@....com> To: William Lee Irwin III <wli@...omorphy.com> cc: linux-kernel@...r.kernel.org, akpm@...ux-foundation.org Subject: Re: [RFC] i386: Remove page sized slabs for pgds and pmds On Wed, 28 Mar 2007, William Lee Irwin III wrote: > I'd also appreciate if it were mentioned who actually wrote this, given > that the patch posted was what I sent you verbatim (and actually > requested you not post for good reasons, some centering around pageattr.c). Ughhh. Sorry I had this in there in early editions but removed the paragraph later. > The salient point from the above, which was conveniently omitted, was > "it's all dominated by PTE caching." However, even this needs some > qualification having to do with the VSZ of the parent process in fork(). > For very small processes, such as cannot be constructed with glibc due > to its massive bloat and cannot be constructed with the standard process > address space layouts due to stacks being too distant from text and > heap, PTE's actually don't substantially outnumber PMD's et al, so > there is more to this story. No that was described in the patch. Quote: "i386 only provides support for caching constructed pgd and pmds. These are comparatively rare to ptes so it is no surprise that the current approach has only minimal effect. ...." - 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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