[lkml]   [2007]   [Mar]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [QUICKLIST 0/4] Arch independent quicklists V2
Andrew Morton wrote:
>>On Tue, 13 Mar 2007 00:13:25 -0700 (PDT) Christoph Lameter <> 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.
Send instant messages to your online friends

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-03-13 09:07    [W:0.319 / U:0.960 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site