f2fs: improve shrink performance of extent nodes

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On the worst case, we need to scan the whole radix tree and every rb-tree to
free the victimed extent_nodes when shrinking.

Pengyang initially introduced a victim_list to record the victimed extent_nodes,
and free these extent_nodes by just scanning a list.

Later, Chao Yu enhances the original patch to improve memory footprint by
removing victim list.

The policy of lru list shrinking becomes:
1) lock lru list's lock
2) trylock extent tree's lock
3) remove extent node from lru list
4) unlock lru list's lock
5) do shrink
6) repeat 1) to 5)

Signed-off-by: Hou Pengyang <houpengyang@huawei.com>
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

...

This commit is contained in:

Hou Pengyang 2016-01-26 12:56:26 +00:00 • committed by Jaegeuk Kim

parent 429267442a

commit 201ef5e080

2 changed files with 29 additions and 48 deletions

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76

fs/f2fs/extent_cache.c

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1

fs/f2fs/f2fs.h

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