From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6E005C43603 for ; Mon, 16 Dec 2019 15:16:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 42ECA206EC for ; Mon, 16 Dec 2019 15:16:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="PvPdIv+x" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728388AbfLPPPw (ORCPT ); Mon, 16 Dec 2019 10:15:52 -0500 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:20572 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728348AbfLPPPt (ORCPT ); Mon, 16 Dec 2019 10:15:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576509347; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=V9udav2/5i2lazV7S5w0n1aATbzqRn8DPmeg8wb0q9Y=; b=PvPdIv+xf9gRQOU6lHHd8SMWmSE8B4J0/Gzc7EIYFe2ZYQQWe/dPgChqSEbO23JWTGFh5t weWH9CrdpmnmiYzG62d9hQZbdm2k+pkYbVbZFEhYhPQWPBTA0WwNAvzh/RhWdlXq5ZOUNm l/FA38Bfg2MAcvBnsQXqq303kTNADnI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-218-uzK5OmL4OJiChe1qs4NZOA-1; Mon, 16 Dec 2019 10:15:44 -0500 X-MC-Unique: uzK5OmL4OJiChe1qs4NZOA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 571358017DF; Mon, 16 Dec 2019 15:15:43 +0000 (UTC) Received: from llong.com (dhcp-17-59.bos.redhat.com [10.18.17.59]) by smtp.corp.redhat.com (Postfix) with ESMTP id A278A60BF4; Mon, 16 Dec 2019 15:15:42 +0000 (UTC) From: Waiman Long To: Peter Zijlstra , Ingo Molnar , Will Deacon Cc: linux-kernel@vger.kernel.org, Bart Van Assche , Waiman Long Subject: [PATCH v2 3/6] locking/lockdep: Track number of zapped lock chains Date: Mon, 16 Dec 2019 10:15:14 -0500 Message-Id: <20191216151517.7060-4-longman@redhat.com> In-Reply-To: <20191216151517.7060-1-longman@redhat.com> References: <20191216151517.7060-1-longman@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a new counter nr_zapped_lock_chains to track the number lock chains that have been removed. Signed-off-by: Waiman Long --- kernel/locking/lockdep.c | 2 ++ kernel/locking/lockdep_internals.h | 1 + kernel/locking/lockdep_proc.c | 2 ++ 3 files changed, 5 insertions(+) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 30ebfe4978d5..8293f7e80ee6 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -2625,6 +2625,7 @@ check_prevs_add(struct task_struct *curr, struct held_lock *next) struct lock_chain lock_chains[MAX_LOCKDEP_CHAINS]; static DECLARE_BITMAP(lock_chains_in_use, MAX_LOCKDEP_CHAINS); static u16 chain_hlocks[MAX_LOCKDEP_CHAIN_HLOCKS]; +unsigned long nr_zapped_lock_chains; unsigned int nr_chain_hlocks; struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i) @@ -4793,6 +4794,7 @@ static void remove_class_from_lock_chain(struct pending_free *pf, */ hlist_del_rcu(&chain->entry); __set_bit(chain - lock_chains, pf->lock_chains_being_freed); + nr_zapped_lock_chains++; #endif } diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h index 5dec0fe12507..35758e469ff7 100644 --- a/kernel/locking/lockdep_internals.h +++ b/kernel/locking/lockdep_internals.h @@ -125,6 +125,7 @@ struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i); extern unsigned long nr_lock_classes; extern unsigned long nr_zapped_classes; +extern unsigned long nr_zapped_lock_chains; extern unsigned long nr_list_entries; long lockdep_next_lockchain(long i); unsigned long lock_chain_count(void); diff --git a/kernel/locking/lockdep_proc.c b/kernel/locking/lockdep_proc.c index 4c7dc0a8935d..7c15dd03cf49 100644 --- a/kernel/locking/lockdep_proc.c +++ b/kernel/locking/lockdep_proc.c @@ -345,6 +345,8 @@ static int lockdep_stats_show(struct seq_file *m, void *v) seq_puts(m, "\n"); seq_printf(m, " zapped classes: %11lu\n", nr_zapped_classes); + seq_printf(m, " zapped lock chains: %11lu\n", + nr_zapped_lock_chains); return 0; } -- 2.18.1