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[2620:137:e000::3:7]) by mx.google.com with ESMTPS id i9-20020a17090332c900b001c3323ff53asi1086079plr.139.2023.11.03.00.27.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Nov 2023 00:27:01 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) client-ip=2620:137:e000::3:7; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=RIxMLPHc; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:7 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by snail.vger.email (Postfix) with ESMTP id 0ED468311BFC; Fri, 3 Nov 2023 00:27:00 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at snail.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229526AbjKCH05 (ORCPT + 36 others); Fri, 3 Nov 2023 03:26:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60348 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232992AbjKCH04 (ORCPT ); Fri, 3 Nov 2023 03:26:56 -0400 Received: from mail-oa1-x2c.google.com (mail-oa1-x2c.google.com [IPv6:2001:4860:4864:20::2c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F21D7184; Fri, 3 Nov 2023 00:26:51 -0700 (PDT) Received: by mail-oa1-x2c.google.com with SMTP id 586e51a60fabf-1efa01323b4so987930fac.3; Fri, 03 Nov 2023 00:26:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1698996409; x=1699601209; darn=vger.kernel.org; h=message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=cAgvdtIcQPX971sbAD4m0YcUgmn+p4/agvvmTkVVwws=; b=RIxMLPHcWnl2PvPYRttSRvVoJ71fezeH+pUmynO6wnZEwNJkGKUYGpu/XnrMCcSgdR 5hABNVLR12X5MVGR7H1/BiPz4aeb7NFWXPHq/7rFvZ60GDzPwO1Dv/jpHI0pQsKnEViq AidaSjhfsRtcD9uLTpSlg7kemYMSW9MEnuKUZedGmKfEOjD5BzHHMme/ZCvX0uu+KCzQ Jyy5aVz+ZMbHynohgfU/tF5I+7d1oUfStfnPeIu9LyzRfaQ/1bNjxVfxQE8H79lTrgsr uDxSYVTf+Raf2dpZU7DtRCSr2On7t8dzmQvTwXNnHKCN4X2IFL0bLSvHgt3WjQ39F8Cw QTHg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698996409; x=1699601209; h=message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=cAgvdtIcQPX971sbAD4m0YcUgmn+p4/agvvmTkVVwws=; b=f5YAwpNy0c2fOh03FW7aIqYgD//XYRY5j5aEa9xvAnOKd3byTHZtS5Q0JWsRRNqxGp h/o2rI/RPisU5TpbGDk3gy1xQNDzZm+S7fwZXFBsFFWWCZs1bjhecQ25pu2D9PH1OtgO QRy9oZyL7YhTWStoxaOY7puX2hE62xjVQFvByvZTd9OKZfOJx6Z2ZzI9KoTlmuJ3Cks2 CCb45+OF4QovuA3lqO4SklQcDYUwjlQejN6Y0EfDSh6BMyy7sfMh4VCYia0ZL2h9sJxX bcZIvvrSdNmzeVI8dovFjEwRtBeL1KHPkeJe+aMUvP/rPAd1+lXtM5inel1EfJEnOTCe pLgQ== X-Gm-Message-State: AOJu0YxKf9EH3lmZ60Wvix3DXO0zIHwSFR1hB0uFqjEHlnuGAxndNESX LPNcbJ3AYgAErQ5OETscgA4= X-Received: by 2002:a05:6871:723:b0:1ef:a87f:5d52 with SMTP id f35-20020a056871072300b001efa87f5d52mr20315557oap.6.1698996408708; Fri, 03 Nov 2023 00:26:48 -0700 (PDT) Received: from MSCND1355B05.fareast.nevint.com ([183.242.39.186]) by smtp.gmail.com with ESMTPSA id b3-20020a63cf43000000b0056c2f1a2f6bsm773341pgj.41.2023.11.03.00.26.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Nov 2023 00:26:47 -0700 (PDT) From: Zqiang To: paulmck@kernel.org, frederic@kernel.org, joel@joelfernandes.org Cc: qiang.zhang1211@gmail.com, rcu@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] rcutorture: Add fqs_holdoff check before the fqs_task is created Date: Fri, 3 Nov 2023 15:26:39 +0800 Message-Id: <20231103072639.11426-1-qiang.zhang1211@gmail.com> X-Mailer: git-send-email 2.17.1 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Fri, 03 Nov 2023 00:27:00 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781526871600198332 X-GMAIL-MSGID: 1781526871600198332 For rcutorture tests that support fqs operations and set fqs_duration greater than zero, the fqs_task kthread will be created. but if the fqs_holdoff is not set, the default value is zero, this cause fqs_task enter a long-term busy loop and won't voluntarily give up the CPU until stopped by kthread_stop(). this commit therefore add for fqs_holdoff check before the fqs_task is created, make sure the fqs_task is created when the fqs_holdoff is also greater than zero. Signed-off-by: Zqiang --- kernel/rcu/rcutorture.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 83999e57b3ea..9f0e6c1cad44 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -3886,7 +3886,9 @@ rcu_torture_init(void) } if (fqs_duration < 0) fqs_duration = 0; - if (fqs_duration) { + if (fqs_holdoff < 0) + fqs_holdoff = 0; + if (fqs_duration && fqs_holdoff) { /* Create the fqs thread */ firsterr = torture_create_kthread(rcu_torture_fqs, NULL, fqs_task);