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authorPeter Zijlstra <>2011-05-24 17:12:04 -0700
committerLinus Torvalds <>2011-05-25 08:39:17 -0700
commit97a894136f29802da19a15541de3c019e1ca147e (patch)
tree1fd3f92ba92a37d5d8527a1f41458091d0a944dc /Documentation
parente4c70a6629f9c74c4b0de258a3951890e9047c82 (diff)
mm: Remove i_mmap_lock lockbreak
Hugh says: "The only significant loser, I think, would be page reclaim (when concurrent with truncation): could spin for a long time waiting for the i_mmap_mutex it expects would soon be dropped? " Counter points: - cpu contention makes the spin stop (need_resched()) - zap pages should be freeing pages at a higher rate than reclaim ever can I think the simplification of the truncate code is definitely worth it. Effectively reverts: 2aa15890f3c ("mm: prevent concurrent unmap_mapping_range() on the same inode") and takes out the code that caused its problem. Signed-off-by: Peter Zijlstra <> Reviewed-by: KAMEZAWA Hiroyuki <> Cc: Hugh Dickins <> Cc: Benjamin Herrenschmidt <> Cc: David Miller <> Cc: Martin Schwidefsky <> Cc: Russell King <> Cc: Paul Mundt <> Cc: Jeff Dike <> Cc: Richard Weinberger <> Cc: Tony Luck <> Cc: Mel Gorman <> Cc: KOSAKI Motohiro <> Cc: Nick Piggin <> Cc: Namhyung Kim <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
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