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| author | Chao Yu <chao2.yu@samsung.com> | 2016-01-08 13:24:00 +0100 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2016-01-08 20:57:18 +0100 |
| commit | 9b72a388f5867f4a31113a41d24bbf1026611d7b (patch) | |
| tree | 86e9e666dfc73e6a4571189d1779c4323ff00a87 | |
| parent | f2fs: use atomic type for node count in extent tree (diff) | |
| download | linux-9b72a388f5867f4a31113a41d24bbf1026611d7b.tar.xz linux-9b72a388f5867f4a31113a41d24bbf1026611d7b.zip | |
f2fs: skip releasing nodes in chindless extent tree
If there are no nodes in extent tree, let's skip releasing step to avoid
any overhead of grabbing/releasing extent tree lock.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
| -rw-r--r-- | fs/f2fs/extent_cache.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c index 9febbc622bf5..ccd5c636d3fe 100644 --- a/fs/f2fs/extent_cache.c +++ b/fs/f2fs/extent_cache.c @@ -570,9 +570,11 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink) /* 1. remove unreferenced extent tree */ list_for_each_entry_safe(et, next, &sbi->zombie_list, list) { - write_lock(&et->lock); - node_cnt += __free_extent_tree(sbi, et, true); - write_unlock(&et->lock); + if (atomic_read(&et->node_cnt)) { + write_lock(&et->lock); + node_cnt += __free_extent_tree(sbi, et, true); + write_unlock(&et->lock); + } list_del_init(&et->list); radix_tree_delete(&sbi->extent_tree_root, et->ino); @@ -618,6 +620,9 @@ free_node: for (i = 0; i < found; i++) { struct extent_tree *et = treevec[i]; + if (!atomic_read(&et->node_cnt)) + continue; + if (write_trylock(&et->lock)) { node_cnt += __free_extent_tree(sbi, et, false); write_unlock(&et->lock); @@ -641,7 +646,7 @@ unsigned int f2fs_destroy_extent_node(struct inode *inode) struct extent_tree *et = F2FS_I(inode)->extent_tree; unsigned int node_cnt = 0; - if (!et) + if (!et || !atomic_read(&et->node_cnt)) return 0; write_lock(&et->lock); |