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 DD7DCC32771 for ; Wed, 15 Jan 2020 21:43:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AFB8622522 for ; Wed, 15 Jan 2020 21:43:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FbcsMRnz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730145AbgAOVnk (ORCPT ); Wed, 15 Jan 2020 16:43:40 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:45639 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729342AbgAOVnh (ORCPT ); Wed, 15 Jan 2020 16:43:37 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579124616; 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=8FMSdmNI02UJe5G/CRhEBPW79yJpej6yWEShxcGB8ik=; b=FbcsMRnzb+PeP3Odk5OQAugQXEcPHv3+SVs1lZAbkG87Um+v+m67Ubzsb5Up77/vpTrd8y he6jQ+wVYsXpxRCT9hyi/9KrsX/CimBPSySrdprCK/v6XdYLYIJoaAjEy0xCXghssSGANn OkfmrKBX20mwmVQ3Q/xQfaXbn2/lLMI= 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-2-zNZZaQtuOyGp3TwZv8kkFg-1; Wed, 15 Jan 2020 16:43:33 -0500 X-MC-Unique: zNZZaQtuOyGp3TwZv8kkFg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id CAEE2107ACC4; Wed, 15 Jan 2020 21:43:31 +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 230175C553; Wed, 15 Jan 2020 21:43:31 +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 v3 1/8] locking/lockdep: Decrement irq context counters when removing lock chain Date: Wed, 15 Jan 2020 16:43:06 -0500 Message-Id: <20200115214313.13253-2-longman@redhat.com> In-Reply-To: <20200115214313.13253-1-longman@redhat.com> References: <20200115214313.13253-1-longman@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are currently three counters to track the irq context of a lock chain - nr_hardirq_chains, nr_softirq_chains and nr_process_chains. They are incremented when a new lock chain is added, but they are not decremented when a lock chain is removed. That causes some of the statistic counts reported by /proc/lockdep_stats to be incorrect. Fix that by decrementing the right counter when a lock chain is removed. Fixes: a0b0fd53e1e6 ("locking/lockdep: Free lock classes that are no longer in use") Signed-off-by: Waiman Long --- kernel/locking/lockdep.c | 36 +++++++++++++++++++++--------- kernel/locking/lockdep_internals.h | 6 +++++ 2 files changed, 32 insertions(+), 10 deletions(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 32282e7112d3..b20fa6236b2a 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -2299,16 +2299,24 @@ static int check_irq_usage(struct task_struct *curr, struct held_lock *prev, return 0; } -static void inc_chains(void) +static void inc_chains(int irq_context) { - if (current->hardirq_context) + if (irq_context & LOCK_CHAIN_HARDIRQ_CONTEXT) nr_hardirq_chains++; - else { - if (current->softirq_context) - nr_softirq_chains++; - else - nr_process_chains++; - } + else if (irq_context & LOCK_CHAIN_SOFTIRQ_CONTEXT) + nr_softirq_chains++; + else + nr_process_chains++; +} + +static void dec_chains(int irq_context) +{ + if (irq_context & LOCK_CHAIN_HARDIRQ_CONTEXT) + nr_hardirq_chains--; + else if (irq_context & LOCK_CHAIN_SOFTIRQ_CONTEXT) + nr_softirq_chains--; + else + nr_process_chains--; } #else @@ -2324,6 +2332,10 @@ static inline void inc_chains(void) nr_process_chains++; } +static void dec_chains(int irq_context) +{ + nr_process_chains--; +} #endif /* CONFIG_TRACE_IRQFLAGS */ static void @@ -2844,7 +2856,7 @@ static inline int add_chain_cache(struct task_struct *curr, hlist_add_head_rcu(&chain->entry, hash_head); debug_atomic_inc(chain_lookup_misses); - inc_chains(); + inc_chains(chain->irq_context); return 1; } @@ -3597,7 +3609,8 @@ mark_usage(struct task_struct *curr, struct held_lock *hlock, int check) static inline unsigned int task_irq_context(struct task_struct *task) { - return 2 * !!task->hardirq_context + !!task->softirq_context; + return LOCK_CHAIN_HARDIRQ_CONTEXT * !!task->hardirq_context + + LOCK_CHAIN_SOFTIRQ_CONTEXT * !!task->softirq_context; } static int separate_irq_context(struct task_struct *curr, @@ -4799,6 +4812,8 @@ static void remove_class_from_lock_chain(struct pending_free *pf, return; /* Overwrite the chain key for concurrent RCU readers. */ WRITE_ONCE(chain->chain_key, chain_key); + dec_chains(chain->irq_context); + /* * Note: calling hlist_del_rcu() from inside a * hlist_for_each_entry_rcu() loop is safe. @@ -4820,6 +4835,7 @@ static void remove_class_from_lock_chain(struct pending_free *pf, } *new_chain = *chain; hlist_add_head_rcu(&new_chain->entry, chainhashentry(chain_key)); + inc_chains(new_chain->irq_context); #endif } diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h index 18d85aebbb57..53500a1dac58 100644 --- a/kernel/locking/lockdep_internals.h +++ b/kernel/locking/lockdep_internals.h @@ -98,6 +98,12 @@ static const unsigned long LOCKF_USED_IN_IRQ_READ = #define MAX_LOCKDEP_CHAINS_BITS 16 +/* + * Bit definitions for lock_chain.irq_context + */ +#define LOCK_CHAIN_SOFTIRQ_CONTEXT (1 << 0) +#define LOCK_CHAIN_HARDIRQ_CONTEXT (1 << 1) + /* * Stack-trace: tightly packed array of stack backtrace * addresses. Protected by the hash_lock. -- 2.18.1