diff options
author | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 17:49:46 +1100 |
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committer | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 17:50:25 +1100 |
commit | be182bff72fae6a3eb25624b39170c40b72f0909 (patch) | |
tree | b77ee014d7850c6e57dae7231a38c0c26cd96b38 /fs/dcache.c | |
parent | 89e6054836a7b1e7500cd70a14b5579e752c9250 (diff) | |
download | linux-next-be182bff72fae6a3eb25624b39170c40b72f0909.tar.gz |
fs: reduce dcache_inode_lock width in lru scanning
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs/dcache.c')
-rw-r--r-- | fs/dcache.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 195706374697..fe8f28a2878e 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -621,7 +621,7 @@ static void shrink_dentry_list(struct list_head *list) dentry = list_entry(list->prev, struct dentry, d_lru); if (!spin_trylock(&dentry->d_lock)) { -relock: +relock1: spin_unlock(&dcache_lru_lock); cpu_relax(); spin_lock(&dcache_lru_lock); @@ -638,20 +638,24 @@ relock: spin_unlock(&dentry->d_lock); continue; } + if (!spin_trylock(&dcache_inode_lock)) { +relock2: + spin_unlock(&dentry->d_lock); + goto relock1; + } if (IS_ROOT(dentry)) parent = NULL; else parent = dentry->d_parent; if (parent && !spin_trylock(&parent->d_lock)) { - spin_unlock(&dentry->d_lock); - goto relock; + spin_unlock(&dcache_inode_lock); + goto relock2; } __dentry_lru_del(dentry); spin_unlock(&dcache_lru_lock); prune_one_dentry(dentry, parent); /* dcache_inode_lock and dentry->d_lock dropped */ - spin_lock(&dcache_inode_lock); spin_lock(&dcache_lru_lock); } } @@ -672,7 +676,6 @@ static void __shrink_dcache_sb(struct super_block *sb, int *count, int flags) LIST_HEAD(tmp); int cnt = *count; - spin_lock(&dcache_inode_lock); relock: spin_lock(&dcache_lru_lock); while (!list_empty(&sb->s_dentry_lru)) { @@ -711,7 +714,6 @@ relock: if (!list_empty(&referenced)) list_splice(&referenced, &sb->s_dentry_lru); spin_unlock(&dcache_lru_lock); - spin_unlock(&dcache_inode_lock); } /** @@ -800,14 +802,12 @@ void shrink_dcache_sb(struct super_block *sb) { LIST_HEAD(tmp); - spin_lock(&dcache_inode_lock); spin_lock(&dcache_lru_lock); while (!list_empty(&sb->s_dentry_lru)) { list_splice_init(&sb->s_dentry_lru, &tmp); shrink_dentry_list(&tmp); } spin_unlock(&dcache_lru_lock); - spin_unlock(&dcache_inode_lock); } EXPORT_SYMBOL(shrink_dcache_sb); |