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authorMartin Bligh <mbligh@google.com>2006-10-28 10:38:25 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-28 11:30:51 -0700
commitbbdb396a60b2ebf7de3b717991e5d3e28c8b7bbd (patch)
treeefeca197ae8a2421940006ace6c1b719b1811a0c /fs/ext4
parent3bb1a852ab6c9cdf211a2f4a2f502340c8c38eca (diff)
[PATCH] Use min of two prio settings in calculating distress for reclaim
If try_to_free_pages / balance_pgdat are called with a gfp_mask specifying GFP_IO and/or GFP_FS, they will reclaim the requisite number of pages, and the reset prev_priority to DEF_PRIORITY (or to some other high (ie: unurgent) value). However, another reclaimer without those gfp_mask flags set (say, GFP_NOIO) may still be struggling to reclaim pages. The concurrent overwrite of zone->prev_priority will cause this GFP_NOIO thread to unexpectedly cease deactivating mapped pages, thus causing reclaim difficulties. Fix this is to key the distress calculation not off zone->prev_priority, but also take into account the local caller's priority by using min(zone->prev_priority, sc->priority) Signed-off-by: Martin J. Bligh <mbligh@google.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/ext4')
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