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authorLinus Torvalds <torvalds@linux-foundation.org>2014-06-08 14:17:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-08 14:17:00 -0700
commitb738d764652dc5aab1c8939f637112981fce9e0e (patch)
treea7e98864dfe0c8076a24cba75febbbdb0a52e9dc /drivers/hsi
parentf8409abdc592e13cefbe4e4a24a84b3d5741e85f (diff)
downloadlinux-b738d764652dc5aab1c8939f637112981fce9e0e.tar.bz2
Don't trigger congestion wait on dirty-but-not-writeout pages
shrink_inactive_list() used to wait 0.1s to avoid congestion when all the pages that were isolated from the inactive list were dirty but not under active writeback. That makes no real sense, and apparently causes major interactivity issues under some loads since 3.11. The ostensible reason for it was to wait for kswapd to start writing pages, but that seems questionable as well, since the congestion wait code seems to trigger for kswapd itself as well. Also, the logic behind delaying anything when we haven't actually started writeback is not clear - it only delays actually starting that writeback. We'll still trigger the congestion waiting if (a) the process is kswapd, and we hit pages flagged for immediate reclaim (b) the process is not kswapd, and the zone backing dev writeback is actually congested. This probably needs to be revisited, but as it is this fixes a reported regression. Reported-by: Felipe Contreras <felipe.contreras@gmail.com> Pinpointed-by: Hillf Danton <dhillf@gmail.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/hsi')
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