Re: [00/17] Large Blocksize Support V3
From: William Lee Irwin III
Date: Fri Apr 27 2007 - 23:16:58 EST
William Lee Irwin III wrote:
>> What sort of strategy do you intend to use to speculatively populate
>> the pagecache with contiguous pages?
On Sat, Apr 28, 2007 at 12:50:26PM +1000, Nick Piggin wrote:
> Andrew outlined it.
I'd like to suggest a few straightforward additions to the proposal:
(1) the interface to the page allocator tries to allocate N pages where
(a) N is a power of 2
(b) some effort is made to get contiguity
(c) some effort is made to fall back to lesser contiguity
(d) some effort is made to get N pages even with no contiguity
(2) a corresponding group freeing interface to the page allocator
(3) Pass the pages around in a list or similar so that O(1) instead of
O(pages) splice operations under the lock suffice for passing
them around. Dissecting compound pages outside locks helps.
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