Martin J. Bligh wrote:
--On Monday, October 31, 2005 11:24:09 -0800 Andrew Morton <[email protected]> wrote:
I suspect this would all be a non-issue if the net drivers were using
__GFP_NOWARN ;)
We still need to allocate them, even if it's GFP_KERNEL. As memory gets
larger and larger, and we have no targetted reclaim, we'll have to blow
away more and more stuff at random before we happen to get contiguous
free areas. Just statistics aren't in your favour ... Getting 4 contig
pages on a 1GB desktop is much harder than on a 128MB machine.
However, these allocations are not of the "easy to reclaim" type, in
which case they just use the regular fragmented-to-shit areas. If no
contiguous pages are available from there, then an easy-reclaim area
needs to be stolen, right?
In which case I don't see why these patches don't have similar long
term failure cases if there is strong demand for higher order
allocations. Prolong things a bit, perhaps, but...
Is not going to get better as time goes on ;-) Yeah, yeah, I know, you
want recreates, numbers, etc. Not the easiest thing to reproduce in a
short-term consistent manner though.
Regardless, I think we need to continue our steady move away from
higher order allocation requirements.
--
SUSE Labs, Novell Inc.
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