Andrew Morton wrote:
On Tue, 13 Mar 2007 00:13:25 -0700 (PDT) Christoph Lameter <[EMAIL PROTECTED]>
wrote:
Page table pages have the characteristics that they are typically zero
or in a known state when they are freed.
Well if they're zero then perhaps they should be released to the page allocator
to satisfy the next __GFP_ZERO request. If that request is for a pagetable
page, we break even (except we get to remove special-case code). If that
__GFP_ZERO allocation was or some application other than for a pagetable, we
win.
iow, can we just nuke 'em?
Page allocator still requires interrupts to be disabled, which this doesn't.
Considering there isn't much else that frees known zeroed pages, I wonder if
it is worthwhile.
Last time the zeroidle discussion came up was IIRC not actually real performance
gain, just cooking the 1024 CPU threaded pagefault numbers ;)
--
SUSE Labs, Novell Inc.
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