Nick Piggin wrote:
On Tuesday 18 September 2007 03:04, Rik van Riel wrote:
Nick Piggin wrote:
(Rik has a patch sitting in -mm I believe which would make this problem
even worse, by doing even less highmem scanning in response to lowmem
allocations).
My patch should not make any difference here, since
balance_pgdat() already scans the zones from high to
low and sets an end_zone variable that determines the
highest zone to scan.
All my patch does is make sure that we do not try to
reclaim excessive amounts of dma or low memory when
a higher zone is full.
Sorry, yeah I had it the wrong way around. Your patch would not
increase the probability of this problem.
We could have some logic in there to scan highmem when buffer
heads are over limit. But that really kind of sucks in that it introduces
some arbitrary point where reclaim behaviour completely changes...
Adding a shrinker for buffer heads is the "logical" approach
Christoph Lameter's slab defragmenting patch set does
this. One reason Andrew has not merged that code yet
is a lack of reviewers, so I am going through it with
a fine comb and hope to have the patches reviewed by
the end of today.
Lets get this bug fixed the right way.
--
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is. Each group
calls the other unpatriotic.
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