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[2620:137:e000::1:20]) by mx.google.com with ESMTP id i27-20020a50871b000000b00425f0e3e6aesi2809258edb.82.2022.05.11.07.26.13; Wed, 11 May 2022 07:26:39 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b=yM8YAfM7; dkim=neutral (no key) header.i=@linutronix.de; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240799AbiEKLzN (ORCPT + 99 others); Wed, 11 May 2022 07:55:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53710 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240124AbiEKLzA (ORCPT ); Wed, 11 May 2022 07:55:00 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DDF86131F22; Wed, 11 May 2022 04:54:58 -0700 (PDT) Date: Wed, 11 May 2022 13:54:56 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1652270097; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Ik0+Jc80krWiudtLaGNDRbmUn/iIBLzgEWndCzx/YpI=; b=yM8YAfM761iJSlXTBG+cYM7dxLdwq9Yz5gROVT50m3CT1FZlNFH4KV6ute57MDfKE9MLLR PyFwQIqajTbevXyQJqVRTQZP64y6sjh1Z/coN5IDA0aA0K8hJtDT3BQGcWLudJXG9ZfK6I GCGLPeay7C2aC05OyjmfqbjSfYQk16sCV/V2YGxCxvYWsPSXSF2vr76QDPTLCLp4Kvklvp 9UKvrtocrM+808KryTTTCKlUI/oRYtbK5m2PmXTWHQBw1JJvD9lZHwROHjlzsUKbBGft7w LGEtlV2urH/JRn43gB+1X303D88DmmzlyL6y5IXeUWsey6T26Els3fau438RkA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1652270097; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Ik0+Jc80krWiudtLaGNDRbmUn/iIBLzgEWndCzx/YpI=; b=Fn510XHqq7PmT/MhN4djHSJEujyLM+OrL0suSPcsJbAAQCRd11c6eeD6aXqZSQ+drM0wTg 6k1GbnuRZ8Nle8DA== From: Sebastian Andrzej Siewior To: Frederic Weisbecker Cc: LKML , linux-rt-users , Mel Gorman , Thomas Gleixner Subject: Re: [RT][PATCH 2/2] tick: Fix timer storm since introduction of timersd Message-ID: References: <20220405010752.1347437-1-frederic@kernel.org> <20220405010752.1347437-2-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20220405010752.1347437-2-frederic@kernel.org> X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED 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 On 2022-04-05 03:07:52 [+0200], Frederic Weisbecker wrote: > If timers are pending while the tick is reprogrammed on nohz_mode, the > next expiry is not armed to fire now, it is delayed one jiffy forward > instead so as not to raise an inextinguishable timer storm with such > scenario: The series of two has been applied. Sebastian