From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A1BDA35F19A; Tue, 9 Jun 2026 09:52:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780998737; cv=none; b=E/BusGZNhpd0v87gnVZltmLp5HDhvP4UnWIL01bjqV15BWNbf6MfhcKEwBBTu968ET2cKZD5mY+9zWTJl9dOFg9/GoWXQZO6abspgk/+q1EzXA4vgUOF0FO3Ej0+qW3pe7zkjRuq3WPUilpdUMFghiIq5LvY9HSzT+gdB1B0Sko= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780998737; c=relaxed/simple; bh=7Gm8IWj74rkR6Fam5HRaVOftsIil1bnkU2DA0s2ev9I=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ARFJiSTDm2awo9pDEPwRW+2uikJ6j7O42LFUeKegenQs3wxzzmIWWm1g9dnq7mk0bCkhPwHmGfFVyv0ivmactGMDsVkVPFX3tqY9fsA3yL8ZSGL7T4BcSCq9QVmnak67Q7Dh0+4w4nKhbW5ZxFDiMUs7uOirKolBhV3Y33mTpr4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=ooLJlfOE; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="ooLJlfOE" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3EA922680; Tue, 9 Jun 2026 02:52:11 -0700 (PDT) Received: from [10.1.27.20] (unknown [10.1.27.20]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 34C193FE53; Tue, 9 Jun 2026 02:52:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1780998736; bh=7Gm8IWj74rkR6Fam5HRaVOftsIil1bnkU2DA0s2ev9I=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ooLJlfOEr7ZL2QA/0vPpHDJ/7YZplsVHE5KNhwqEYENwV6So+5heyVPezWy6SlWvD TOQSEhoB8h3sZ1jQ2osWz+vvs3O9hgNOakeaWDVW7cUQM09OXWA2+BlAmbkrS938Ua KAxw7NccdP4sdTsMo1sNJw4KHX9lCa8q9FWqQsQk= Message-ID: Date: Tue, 9 Jun 2026 10:52:11 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/5] s390/tick: Remove CIF_NOHZ_DELAY flag To: Mete Durlu , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Sven Schnelle , "Rafael J. Wysocki" , Daniel Lezcano , Anna-Maria Behnsen , Frederic Weisbecker , Ingo Molnar , Thomas Gleixner Cc: Ilya Leoshkevich , Christian Borntraeger , linux-s390 , linux-kernel References: <20260609075213.31094-1-meted@linux.ibm.com> <20260609075213.31094-2-meted@linux.ibm.com> <7d2ace86-f355-4ff7-886b-7963574b2202@linux.ibm.com> Content-Language: en-US From: Christian Loehle In-Reply-To: <7d2ace86-f355-4ff7-886b-7963574b2202@linux.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 6/9/26 10:40, Mete Durlu wrote: > On 6/9/26 10:10, Christian Loehle wrote: >> On 6/9/26 08:52, Mete Durlu wrote: >>> Remove obsolete tick delay heuristic [1]. The upcoming cpuidle driver >>> handles frequent sleep/wakeup cycles more effectively. >>> >>> [1] https://lore.kernel.org/all/20090929122533.402715150@de.ibm.com/ >>> >>> Suggested-by: Heiko Carstens >>> Signed-off-by: Mete Durlu >>> --- >> For bisectibility does it make sense to move this and 2/5 to the end? > > I am unable to see how that would help. Could you elaborate? CIF_NOHZ_DELAY is only obsolete because of the new s390 cpuidle driver handles NOHZ better overall right? So my suggestion was to only obsolete it once everything is in place?