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authorDenis V. Lunev <den@openvz.org>2007-10-16 23:29:53 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:42:57 -0700
commit37c42524d6090644206ae6d310d7e830bd3ccb47 (patch)
tree53dcaad31bb6b74d1d37491b56450a675490b88b /fs/nls/nls_cp860.c
parent44a2db43eb715b54618bf01520cc5d46376cdbe2 (diff)
downloadlinux-37c42524d6090644206ae6d310d7e830bd3ccb47.tar.bz2
shrink_dcache_sb speedup
This patch makes shrink_dcache_sb consistent with dentry pruning policy. On the first pass we iterate over dentry unused list and prepare some dentries for removal. However, since the existing code moves evicted dentries to the beginning of the LRU it can happen that fresh dentries from other superblocks will be inserted *before* our dentries. This can result in significant slowdown of shrink_dcache_sb(). Moreover, for virtual filesystems like unionfs which can call dput() during dentries kill existing code results in O(n^2) complexity. We observed 2 minutes shrink_dcache_sb() with only 35000 dentries. To avoid this effects we propose to isolate sb dentries at the end of LRU list. Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Kirill Korotaev <dev@openvz.org> Signed-off-by: Andrey Mirkin <amirkin@openvz.org> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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