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locks: convert fl_link to a hlist_node

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Testing has shown that iterating over the blocked_list for deadlock
detection turns out to be a bottleneck. In order to alleviate that,
begin the process of turning it into a hashtable. We start by turning
the fl_link into a hlist_node and the global lists into hlists. A later
patch will do the conversion of the blocked_list to a hashtable.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jeff Layton
2013-06-21 08:58:17 -04:00
committed by Al Viro
parent 4e8c765d38
commit 139ca04ee5
2 changed files with 13 additions and 13 deletions
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include/linux/fs.h
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@@ -946,7 +946,7 @@ int locks_in_grace(struct net *);
*/
struct file_lock {
struct file_lock *fl_next; /* singly linked list for this inode */
struct list_head fl_link; /* doubly linked list of all locks */
struct hlist_node fl_link; /* node in global lists */
struct list_head fl_block; /* circular list of blocked processes */
fl_owner_t fl_owner;
unsigned int fl_flags;