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inode: convert inode_sb_list_lock to per-sb

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The process of reducing contention on per-superblock inode lists
starts with moving the locking to match the per-superblock inode
list. This takes the global lock out of the picture and reduces the
contention problems to within a single filesystem. This doesn't get
rid of contention as the locks still have global CPU scope, but it
does isolate operations on different superblocks form each other.

Signed-off-by: Dave Chinner <[email protected]>
Signed-off-by: Josef Bacik <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Tested-by: Dave Chinner <[email protected]>
This commit is contained in:
Dave Chinner 2015-03-04 12:37:22 -05:00 • committed by Josef Bacik
commit 74278da9f7
10 changed files with 57 additions and 54 deletions
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3
fs/super.c
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@ -191,6 +191,7 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags)
INIT_HLIST_NODE(&s->s_instances);
INIT_HLIST_BL_HEAD(&s->s_anon);
INIT_LIST_HEAD(&s->s_inodes);
spin_lock_init(&s->s_inode_list_lock);
if (list_lru_init_memcg(&s->s_dentry_lru))
goto fail;
@ -399,7 +400,7 @@ void generic_shutdown_super(struct super_block *sb)
sync_filesystem(sb);
sb->s_flags &= ~MS_ACTIVE;
fsnotify_unmount_inodes(&sb->s_inodes);
fsnotify_unmount_inodes(sb);
evict_inodes(sb);