From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759777AbZEaOvl (ORCPT ); Sun, 31 May 2009 10:51:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759327AbZEaOur (ORCPT ); Sun, 31 May 2009 10:50:47 -0400 Received: from mail-px0-f123.google.com ([209.85.216.123]:45632 "EHLO mail-px0-f123.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757728AbZEaOup (ORCPT ); Sun, 31 May 2009 10:50:45 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=vLmNNfcHXy8+Tz+Sn+StXJMVUDNMRIMa8aj614cfmV1gFzx/EFlxlPgAoa5xAYPF1s 9PGY0SUdP2BqZbPmdiPyGVmV7Mkq/svU6XkFROyqeAHJ8gS47KWRsalDqPbtChnuANdU a7IGaQb7QWxbpqg2KVIdFq48a06SgNHVTs+Ys= From: tom.leiming@gmail.com To: mingo@elte.hu Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, a.p.zijlstra@chello.nl, Ming Lei Subject: [PATCH 8/8] kernel:lockdep:add statistics info for max bfs queue depth Date: Sun, 31 May 2009 22:49:25 +0800 Message-Id: <1243781365-26814-9-git-send-email-tom.leiming@gmail.com> X-Mailer: git-send-email 1.6.0.GIT In-Reply-To: <1243781365-26814-8-git-send-email-tom.leiming@gmail.com> References: <1243781365-26814-1-git-send-email-tom.leiming@gmail.com> <1243781365-26814-2-git-send-email-tom.leiming@gmail.com> <1243781365-26814-3-git-send-email-tom.leiming@gmail.com> <1243781365-26814-4-git-send-email-tom.leiming@gmail.com> <1243781365-26814-5-git-send-email-tom.leiming@gmail.com> <1243781365-26814-6-git-send-email-tom.leiming@gmail.com> <1243781365-26814-7-git-send-email-tom.leiming@gmail.com> <1243781365-26814-8-git-send-email-tom.leiming@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ming Lei Signed-off-by: Ming Lei --- kernel/lockdep.c | 6 +++++- kernel/lockdep_internals.h | 3 ++- kernel/lockdep_proc.c | 2 ++ 3 files changed, 9 insertions(+), 2 deletions(-) diff --git a/kernel/lockdep.c b/kernel/lockdep.c index faa39cb..b20f08b 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -929,7 +929,7 @@ static int add_lock_to_list(struct lock_class *class, struct lock_class *this, unsigned long bfs_accessed[BITS_TO_LONGS(MAX_LOCKDEP_ENTRIES)]; static struct circular_queue lock_cq; - +unsigned int max_bfs_queue_depth; static int __bfs(struct lock_list *source_entry, void *data, int (*match)(struct lock_list *entry, void *data), @@ -975,6 +975,7 @@ static int __bfs(struct lock_list *source_entry, list_for_each_entry(entry, head, entry) { if (!lock_accessed(entry)) { + unsigned int cq_depth; mark_lock_accessed(entry, lock); if (match(entry, data)) { *target_entry = entry; @@ -986,6 +987,9 @@ static int __bfs(struct lock_list *source_entry, ret = -1; goto exit; } + cq_depth = __cq_get_elem_count(cq); + if (max_bfs_queue_depth < cq_depth) + max_bfs_queue_depth = cq_depth; } } } diff --git a/kernel/lockdep_internals.h b/kernel/lockdep_internals.h index b115aaa..6baa880 100644 --- a/kernel/lockdep_internals.h +++ b/kernel/lockdep_internals.h @@ -138,6 +138,7 @@ extern atomic_t nr_find_usage_backwards_recursions; #endif +extern unsigned int max_bfs_queue_depth; extern unsigned long nr_list_entries; extern struct lock_list list_entries[MAX_LOCKDEP_ENTRIES]; extern unsigned long bfs_accessed[]; @@ -191,7 +192,7 @@ static inline int __cq_dequeue(struct circular_queue *cq, unsigned long *elem) return 0; } -static inline int __cq_get_elem_count(struct circular_queue *cq) +static inline unsigned int __cq_get_elem_count(struct circular_queue *cq) { return (cq->rear - cq->front)&(MAX_CIRCULAR_QUE_SIZE-1); } diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c index d7135aa..9a1bf34 100644 --- a/kernel/lockdep_proc.c +++ b/kernel/lockdep_proc.c @@ -411,6 +411,8 @@ static int lockdep_stats_show(struct seq_file *m, void *v) max_lockdep_depth); seq_printf(m, " max recursion depth: %11u\n", max_recursion_depth); + seq_printf(m, " max bfs queue depth: %11u\n", + max_bfs_queue_depth); lockdep_stats_debug_show(m); seq_printf(m, " debug_locks: %11u\n", debug_locks); -- 1.6.0.GIT