I was thinking an explicit GFP_READAHEAD and PG_readahead.
Where a GFP_READAHEAD allocation would fail if it can't
find any non-readahead pages. And it would fail if it
had to perform I/O.
That's not nice - it'd result in large LRU walks. But it'd
be better than the 10x slowdown which readahead thrashing
causes.
Any clever ideas?
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