From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B970C1B4F0A for ; Tue, 19 May 2026 09:13:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779182001; cv=none; b=sDYazSKwBU26xkwoiaQic/LGDQwLwOV9zVW4xqpvT34satIciEpf3p2o/TeTKE9+pJ85oEtr91D1AEQknONy9UK4BH4oRrJVd8nEbIAGOBFBH5g4i4rMB1Mpjgb2vvF8APZ6sacKw457ef6TKLqpbklHnNoEC/HAGeC+dxYLFG4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779182001; c=relaxed/simple; bh=93lBsWTSiqa8vR2ldcHslj5Ge2Dbgay4d9cSEbwatoE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=R//mH/S8xhCUMY69m92eJ3H5kdkRsQIfIPDcbqBTMmsqrA3qjRyBoPow9dE7PF3c0M3On1fUgj2o0WbqbL3xIS7zSoswi18UjogSWp0AJVRVztNLyUuOSNw6oP8xaPBwsJ41IMaCxKbfEJ6s9toaIHdGJPdzMX2paycUTtmVLcQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=ovypTPDS; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ovypTPDS" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=dIsu5N+uKnWmjjt+/pZkh8sTvLNJVqZQO91eqnWSgEQ=; b=ovypTPDSTmU7KDS7CfkueAq52i GIM3Sl3uSEV+DUyd52QDbgw0NQvQ7IYUk86BPmhRO+JSD6kUw4xhgg3xTshiemj4quaYnyZ3lrwF4 tIJpDOiLq0MKGp+zf2O1E8DU7o6TV2EKfNTbZZh+9Oz9VQL66a0jZ31i9IjTRFDOeaza3Tqkvx22E iRivAVQPunD8iyMJkC3zmsQltSzXTAbx7w5RqamBp8+/6Enw7FNTqIFxmQV4IMiy9XTIYy3H5QoGK l2wl1rVW9MHmiUP8dLLMMdI0mTbTSlBkmt42mOLgG1AHpKzBs4ZZSy/wC6LFfVUeCMIlIQMFwcicM I4wcRvjw==; Received: from 2001-1c00-8d85-4b00-266e-96ff-fe07-7dcc.cable.dynamic.v6.ziggo.nl ([2001:1c00:8d85:4b00:266e:96ff:fe07:7dcc] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPGVk-0000000Df5e-1DfR; Tue, 19 May 2026 09:13:12 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 2F908300182; Tue, 19 May 2026 11:13:12 +0200 (CEST) Date: Tue, 19 May 2026 11:13:12 +0200 From: Peter Zijlstra To: Qais Yousef 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: <20260519091312.GB3102624@noisy.programming.kicks-ass.net> References: <20260517040740.444729-1-qyousef@layalina.io> <20260518074000.GR3102624@noisy.programming.kicks-ass.net> <20260519004256.tixhmh6hmfnbu7cx@airbuntu> 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=us-ascii Content-Disposition: inline In-Reply-To: <20260519004256.tixhmh6hmfnbu7cx@airbuntu> On Tue, May 19, 2026 at 01:42:56AM +0100, Qais Yousef wrote: > 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 :) ARM64 Generic Entry patches are en-route somewhere. I'll get sorted.