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authorWu Fengguang <fengguang.wu@intel.com>2010-10-26 14:21:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 16:52:08 -0700
commit4cbec4c8b9fda9ec784086fe7f74cd32a8adda95 (patch)
tree669c3df27982345b52d0bfca8026e3f275e64a03 /fs
parent0e093d99763eb4cea09f8ca4f1d01f34e121d10b (diff)
writeback: remove the internal 5% low bound on dirty_ratio
The dirty_ratio was silently limited in global_dirty_limits() to >= 5%. This is not a user expected behavior. And it's inconsistent with calc_period_shift(), which uses the plain vm_dirty_ratio value. Let's remove the internal bound. At the same time, fix balance_dirty_pages() to work with the dirty_thresh=0 case. This allows applications to proceed when dirty+writeback pages are all cleaned. And ">" fits with the name "exceeded" better than ">=" does. Neil thinks it is an aesthetic improvement as well as a functional one :) Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Jan Kara <jack@suse.cz> Proposed-by: Con Kolivas <kernel@kolivas.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reviewed-by: Rik van Riel <riel@redhat.com> Reviewed-by: Neil Brown <neilb@suse.de> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Michael Rubin <mrubin@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/fs-writeback.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index ab38fef1c9a1..97d2951bd4d1 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -582,7 +582,7 @@ static inline bool over_bground_thresh(void)
global_dirty_limits(&background_thresh, &dirty_thresh);
return (global_page_state(NR_FILE_DIRTY) +
- global_page_state(NR_UNSTABLE_NFS) >= background_thresh);
+ global_page_state(NR_UNSTABLE_NFS) > background_thresh);
}
/*

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