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author | Martin Bligh <mbligh@google.com> | 2006-10-28 21:38:25 +0400 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-28 22:30:51 +0400 |
commit | bbdb396a60b2ebf7de3b717991e5d3e28c8b7bbd (patch) | |
tree | efeca197ae8a2421940006ace6c1b719b1811a0c /fs/ext4 | |
parent | 3bb1a852ab6c9cdf211a2f4a2f502340c8c38eca (diff) | |
download | linux-bbdb396a60b2ebf7de3b717991e5d3e28c8b7bbd.tar.xz |
[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')
0 files changed, 0 insertions, 0 deletions