From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f49.google.com (mail-wm1-f49.google.com [209.85.128.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 87ECC1F4C8E for ; Tue, 19 May 2026 00:43:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779151383; cv=none; b=c+krWJJhngTiz1QfFN7Gyu/EqqjPR4mdHkgHdlpdL8PeJRG2AyoOk6QF5YmofW4CAjg7zvTd+tcQzxMopeQMgexPweqYB3DqxcHKcRNchYjCJ9nx0nWXYoC5PBSEUMcqmPfU7RKY2HsWDIu8G3v0QmXkPEiex5/QiMcfVyWYNBg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779151383; c=relaxed/simple; bh=x8+/Y82dHzAiLN4wL3jyPO9PIQORkZrPnDiF0mD+ABo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=GDtSMVf6J3jS98tDD4QMFP0ruFDAAdR9EFa1svz1OlwUkTwM3vIVt2PyhiJ0O7ZF6OfpGX2Ejz9Zsr+KJWaEFMJCLBBK1jurX/En6BJjHHGfcrHh6Nj1ispFah01LiQprbka8e4L56omwFny/VJK+6kHah9iSXX4LU8Snbpnwzg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=layalina.io; spf=pass smtp.mailfrom=layalina.io; dkim=pass (2048-bit key) header.d=layalina-io.20251104.gappssmtp.com header.i=@layalina-io.20251104.gappssmtp.com header.b=VMlM3eP6; arc=none smtp.client-ip=209.85.128.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=layalina.io Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=layalina.io Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=layalina-io.20251104.gappssmtp.com header.i=@layalina-io.20251104.gappssmtp.com header.b="VMlM3eP6" Received: by mail-wm1-f49.google.com with SMTP id 5b1f17b1804b1-488af9fdaa7so13367365e9.1 for ; Mon, 18 May 2026 17:43:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=layalina-io.20251104.gappssmtp.com; s=20251104; t=1779151379; x=1779756179; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=EEObUdVVL3bOAU9k/Vb25JvcML5poqVwkLvfUt3cdC8=; b=VMlM3eP6TXiMfMlP0YauvEPqF52ZuCWJFuzZu5lNRIibTlkzeA1q0rWhrlFhBfu1rf WMg1HsPMqs/tom1Kul8Wx0tDxejp+1FdClkDUBAc9IyWuPg+mdp2Oflv8JMca01ZIyTD Ve0Kp1ViOzSZGULj7gNVnSyMHjCtkgXAiHxHkyJnOnIQCkgVvnfDL97N22cMIfRRSc/4 gnrMrK7WHPSpWvtFr9+FuCfIBy/XynG/o6CwY8qH3HkRvo7Hl1G4bbzeRHQd+TwrOgeH fqsYF6EgPvhl7x21F00wUtWIAwFqVMHGPcHF4yACIXNS4t86j0pWz7ZKV6i2VTGxMxkp AOhg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779151379; x=1779756179; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=EEObUdVVL3bOAU9k/Vb25JvcML5poqVwkLvfUt3cdC8=; b=NAZ4n+nGIv1zGV4w9RK/RpZBsqolZvNu+GELR+Yc51x9s5HB/LOKOREHuM898oh7ES p24ZskJ2jQLJ9TGoOFX1DYePzxlBsY8N8EQSTWDBNeAo+hzTf1XR9t6YBqRAII9iLLmJ JyIShwbrZNJCWnhPEMq3/r0CYzm7Atla21unPiLLQ0h1CKp6EiW9eiIxfYKOYras9mCR dCXoFCqJHnz//AfjI0sIKfhZe73uWuwLcn0S5PwGA/+woxrxy0V7KOa+Sq/e+tAVXp0A 2FDgpVHc0y/Ju66ryrqNgnNwh6jnfCSALEyWVUzDEEQsEhvjWc3g/7lbOc0UmS3gayNj UCVg== X-Forwarded-Encrypted: i=1; AFNElJ/gQFm2telkUhvxqR34q2HdC5wgg3r+zkYEbXk/+RcizFxQ+xlLMk3FwnW1Qli96fv+u31eIRgcBQzp1Mg=@vger.kernel.org X-Gm-Message-State: AOJu0Yw+s+9L0jMBjgtId5OEyP0LytXOl9duKXFniHnaA8zidAB6CrSm AfLz791e9+Lpg5Iew6KzBpDRKXgHpkSd2IXGK+DtnwYSoi/WKslzUrYY6ymjVgQXAtQ= X-Gm-Gg: Acq92OECB3+P3+5bk5SOEmPke6jKIwuH+z/5T+RQOVmfLR8nAvMmrjYwDFOCx3z4v3S 4B0EPZJsEWeGATubMxzKefSeBGA0kW2TMtJuS76KBsVIY1UpaBMYOerytI29oNbvcaRYThq0x2L Fn5pMv1xaKrcc60uTdqn+VC+e4DiU8F+VYQZ59rfEczPkEYoeY2SNZE9KbdqIVvx5eZSXe06Hq2 k2OnaF56IrzXHWYRWKKtNBuamX/oGp2SUrvea2sTU35y6pkf7IHaz9TMdPD66XBYTTrPjeQdSDy QvJlvVUbC6XcvlWIuBlpaBAzsifAlC0IWiqk2/io3myhUZHtFI/Y3zjybs4DosEzKdtWvXLV8f+ AwZyyc2Vs9+n2FGI3SKERp+Z2V1Vmb2MFHVC5EYkDGjRC6zA2dFrdHcrDSew1k2Jo1jhIFF+bwu Z1SXSQ3x5m7M01eFbB/oBeSCS57Q== X-Received: by 2002:a05:600c:8184:b0:488:ffb1:494c with SMTP id 5b1f17b1804b1-48fe60ed790mr257472525e9.12.1779151379343; Mon, 18 May 2026 17:42:59 -0700 (PDT) Received: from airbuntu ([149.40.48.71]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4900c16c744sm105812495e9.3.2026.05.18.17.42.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 May 2026 17:42:58 -0700 (PDT) Date: Tue, 19 May 2026 01:42:56 +0100 From: Qais Yousef To: Peter Zijlstra Cc: Ingo Molnar , Vincent Guittot , Juri Lelli , Steven Rostedt , John Stultz , Thomas Gleixner , Frederic Weisbecker , linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/3] sched/tick: Decouple sched_tick() from HZ Message-ID: <20260519004256.tixhmh6hmfnbu7cx@airbuntu> References: <20260517040740.444729-1-qyousef@layalina.io> <20260518074000.GR3102624@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260518074000.GR3102624@noisy.programming.kicks-ass.net> On 05/18/26 09:40, Peter Zijlstra wrote: > On Sun, May 17, 2026 at 05:07:37AM +0100, Qais Yousef wrote: > > With HRTICK now is default on, > > .. for archs that use GENERIC_ENTRY. So for example, ARM64 doesn't (yet) > have this. I remembering trying to trace down the deps on HRTIMER_REARM_DEFERRED and then got distracted. HRTIMER on arm are cheap. Do we need this deps on generic entry? Anyways. More reason to decouple I take :)