On 08/19/2016 03:12 PM, Andrea Arcangeli wrote:
Hello Mel,
Hi Andrea,
On Fri, Jul 08, 2016 at 10:34:36AM +0100, Mel Gorman wrote:
Minor changes this time
Changelog since v8
This is the latest version of a series that moves LRUs from the zones to
I'm afraid this is a bit incomplete...
I had troubles in rebasing the compaction-enabled zone_reclaim feature
(now node_reclaim) to the node model.
What's that? Never head of this before, but sounds scary :) I thought
that zone_reclaim itself was rather discouraged nowadays, not a big
candidate for further improvement.,,
That is because compaction is
still zone based, and so I would need to do a loop of compaction calls
(for each zone in the node), but what's the point? Movable memory can
always go anywhere, can't it?
Hm I'm not so sure. Are all movable allocations highmem? For example
Joonsoo mentions in his ZONE_CMA patchset "blockdev file cache page
[...] usually has __GFP_MOVABLE but not __GFP_HIGHMEM and __GFP_USER".
Now we also have Minchan's infrastructure for arbitrary driver
compaction, so those will be movable, but potentially still restricted
to e.g. DMA32...
Vlastimil
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