From patchwork Mon Jun 17 15:13:51 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 2734191 Return-Path: X-Original-To: patchwork-ceph-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 8E24BC0AB1 for ; Mon, 17 Jun 2013 15:18:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C9E462036D for ; Mon, 17 Jun 2013 15:18:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A7C2120386 for ; Mon, 17 Jun 2013 15:18:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752374Ab3FQPSN (ORCPT ); Mon, 17 Jun 2013 11:18:13 -0400 Received: from mx1.redhat.com ([209.132.183.28]:21523 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752042Ab3FQPOd (ORCPT ); Mon, 17 Jun 2013 11:14:33 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r5HFE7Po014441 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Mon, 17 Jun 2013 11:14:07 -0400 Received: from sikun.lab.eng.rdu2.redhat.com (sikun.lab.eng.rdu2.redhat.com [10.8.0.43]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r5HFDuWZ009391; Mon, 17 Jun 2013 11:14:06 -0400 From: Jeff Layton To: viro@zeniv.linux.org.uk, matthew@wil.cx, bfields@fieldses.org Cc: dhowells@redhat.com, sage@inktank.com, smfrench@gmail.com, swhiteho@redhat.com, Trond.Myklebust@netapp.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-afs@lists.infradead.org, ceph-devel@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, cluster-devel@redhat.com, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, piastryyy@gmail.com Subject: [PATCH v3 08/13] locks: convert fl_link to a hlist_node Date: Mon, 17 Jun 2013 11:13:51 -0400 Message-Id: <1371482036-15958-9-git-send-email-jlayton@redhat.com> In-Reply-To: <1371482036-15958-1-git-send-email-jlayton@redhat.com> References: <1371482036-15958-1-git-send-email-jlayton@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 Sender: ceph-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org X-Spam-Status: No, score=-8.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Acked-by: J. Bruce Fields --- fs/locks.c | 24 ++++++++++++------------ include/linux/fs.h | 2 +- 2 files changed, 13 insertions(+), 13 deletions(-) diff --git a/fs/locks.c b/fs/locks.c index a8f3b33..32826ed 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -157,13 +157,13 @@ int lease_break_time = 45; * The global file_lock_list is only used for displaying /proc/locks. Protected * by the file_lock_lock. */ -static LIST_HEAD(file_lock_list); +static HLIST_HEAD(file_lock_list); /* * The blocked_list is used to find POSIX lock loops for deadlock detection. * Protected by file_lock_lock. */ -static LIST_HEAD(blocked_list); +static HLIST_HEAD(blocked_list); /* Protects the two list heads above, and fl->fl_block list. */ static DEFINE_SPINLOCK(file_lock_lock); @@ -172,7 +172,7 @@ static struct kmem_cache *filelock_cache __read_mostly; static void locks_init_lock_heads(struct file_lock *fl) { - INIT_LIST_HEAD(&fl->fl_link); + INIT_HLIST_NODE(&fl->fl_link); INIT_LIST_HEAD(&fl->fl_block); init_waitqueue_head(&fl->fl_wait); } @@ -206,7 +206,7 @@ void locks_free_lock(struct file_lock *fl) { BUG_ON(waitqueue_active(&fl->fl_wait)); BUG_ON(!list_empty(&fl->fl_block)); - BUG_ON(!list_empty(&fl->fl_link)); + BUG_ON(!hlist_unhashed(&fl->fl_link)); locks_release_private(fl); kmem_cache_free(filelock_cache, fl); @@ -484,7 +484,7 @@ static inline void locks_insert_global_locks(struct file_lock *waiter) { spin_lock(&file_lock_lock); - list_add_tail(&waiter->fl_link, &file_lock_list); + hlist_add_head(&waiter->fl_link, &file_lock_list); spin_unlock(&file_lock_lock); } @@ -492,20 +492,20 @@ static inline void locks_delete_global_locks(struct file_lock *waiter) { spin_lock(&file_lock_lock); - list_del_init(&waiter->fl_link); + hlist_del_init(&waiter->fl_link); spin_unlock(&file_lock_lock); } static inline void locks_insert_global_blocked(struct file_lock *waiter) { - list_add(&waiter->fl_link, &blocked_list); + hlist_add_head(&waiter->fl_link, &blocked_list); } static inline void locks_delete_global_blocked(struct file_lock *waiter) { - list_del_init(&waiter->fl_link); + hlist_del_init(&waiter->fl_link); } /* Remove waiter from blocker's block list. @@ -730,7 +730,7 @@ static struct file_lock *what_owner_is_waiting_for(struct file_lock *block_fl) { struct file_lock *fl; - list_for_each_entry(fl, &blocked_list, fl_link) { + hlist_for_each_entry(fl, &blocked_list, fl_link) { if (posix_same_owner(fl, block_fl)) return fl->fl_next; } @@ -2285,7 +2285,7 @@ static int locks_show(struct seq_file *f, void *v) { struct file_lock *fl, *bfl; - fl = list_entry(v, struct file_lock, fl_link); + fl = hlist_entry(v, struct file_lock, fl_link); lock_get_status(f, fl, *((loff_t *)f->private), ""); @@ -2301,14 +2301,14 @@ static void *locks_start(struct seq_file *f, loff_t *pos) spin_lock(&file_lock_lock); *p = (*pos + 1); - return seq_list_start(&file_lock_list, *pos); + return seq_hlist_start(&file_lock_list, *pos); } static void *locks_next(struct seq_file *f, void *v, loff_t *pos) { loff_t *p = f->private; ++*p; - return seq_list_next(v, &file_lock_list, pos); + return seq_hlist_next(v, &file_lock_list, pos); } static void locks_stop(struct seq_file *f, void *v) diff --git a/include/linux/fs.h b/include/linux/fs.h index e2f896d..3b340f7 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -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;