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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 80138C433E1 for ; Fri, 14 Aug 2020 06:46:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 61C0820708 for ; Fri, 14 Aug 2020 06:46:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726124AbgHNGq7 (ORCPT ); Fri, 14 Aug 2020 02:46:59 -0400 Received: from mail.windriver.com ([147.11.1.11]:36062 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726064AbgHNGq6 (ORCPT ); Fri, 14 Aug 2020 02:46:58 -0400 Received: from ALA-HCB.corp.ad.wrs.com (ala-hcb.corp.ad.wrs.com [147.11.189.41]) by mail.windriver.com (8.15.2/8.15.2) with ESMTPS id 07E6kCBH029450 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Thu, 13 Aug 2020 23:46:13 -0700 (PDT) Received: from pek-qzhang2-d1.wrs.com (128.224.162.183) by ALA-HCB.corp.ad.wrs.com (147.11.189.41) with Microsoft SMTP Server id 14.3.487.0; Thu, 13 Aug 2020 23:45:59 -0700 From: To: , , , , , CC: , Subject: [PATCH] rcu: shrink each possible cpu krcp Date: Fri, 14 Aug 2020 14:45:57 +0800 Message-ID: <20200814064557.17365-1-qiang.zhang@windriver.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain Sender: rcu-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: Zqiang Due to cpu hotplug. some cpu may be offline after call "kfree_call_rcu" func, if the shrinker is triggered at this time, we should drain each possible cpu "krcp". Signed-off-by: Zqiang --- kernel/rcu/tree.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 8ce77d9ac716..619ccbb3fe4b 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3443,7 +3443,7 @@ kfree_rcu_shrink_count(struct shrinker *shrink, struct shrink_control *sc) unsigned long count = 0; /* Snapshot count of all CPUs */ - for_each_online_cpu(cpu) { + for_each_possible_cpu(cpu) { struct kfree_rcu_cpu *krcp = per_cpu_ptr(&krc, cpu); count += READ_ONCE(krcp->count); @@ -3458,7 +3458,7 @@ kfree_rcu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) int cpu, freed = 0; unsigned long flags; - for_each_online_cpu(cpu) { + for_each_possible_cpu(cpu) { int count; struct kfree_rcu_cpu *krcp = per_cpu_ptr(&krc, cpu); @@ -3491,7 +3491,7 @@ void __init kfree_rcu_scheduler_running(void) int cpu; unsigned long flags; - for_each_online_cpu(cpu) { + for_each_possible_cpu(cpu) { struct kfree_rcu_cpu *krcp = per_cpu_ptr(&krc, cpu); raw_spin_lock_irqsave(&krcp->lock, flags); -- 2.17.1