linux-kernel - Re: [RFC] i386: Remove page sized slabs for pgds and pmds

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Message-ID: <Pine.LNX.4.64.0703281435330.14017@schroedinger.engr.sgi.com>
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. ...."
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