Messages in this thread | | | Date | Tue, 13 Mar 2007 19:03:38 +1100 | From | Nick Piggin <> | Subject | Re: [QUICKLIST 0/4] Arch independent quicklists V2 |
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Andrew Morton wrote: >>On Tue, 13 Mar 2007 00:13:25 -0700 (PDT) Christoph Lameter <clameter@sgi.com> 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 ;)
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