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 A486F3B7B96 for ; Thu, 28 May 2026 11:45:38 +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=1779968740; cv=none; b=amIlxU5q9w9lwR6nNJojhVWW6AM37U1RSoYKsfHU83sIEsaKNon5sM8ASqZBjtf2h/8SaWQDYoyV8N9ym/4+IRKDLPFPKPKwd/oo2Ni48281yzphSZesWkziZ8MHhahraYfUtsJSdnlVy1Cnuw/fYOtynJnKM1eof6mYXt+4OLg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779968740; c=relaxed/simple; bh=XZBXKX8nX+bwrlFb0bzF+QpT5RDnvGo2VDER/ZTYApg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=HBdvR0qqeM9yxQ86bj2BP/UHFjwPQk1AXqF4SznSW0Vm1W3fODEXd6NdqK56dOYvC3fXm4S+jkwo4gR3T+lICLrnKLzxejEQXJOO+3ckPLzdBWx9eaooEOzNNLc3iRDyZxUcMEGCu23OD28nDLoeIUonEbKptia/ibr6GS+5K/M= 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=rhOhJLkV; 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="rhOhJLkV" 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=XZBXKX8nX+bwrlFb0bzF+QpT5RDnvGo2VDER/ZTYApg=; b=rhOhJLkV1/+Vg4tft+4LNVJtvD d+jhMZNL38QN3kgI9/EoLT6s4WHLPMyj5n5x3MslfLxJ/BfZ1g/+0gdeEoJYaVgWBgZu3l2ufZmeP qnnOA9F+74vCFOyCcPuHZksL4vetU3LgeTYayfaE8Jy1yYzs+KdI1L5ahO5TeoNI6EBnNLEc0CfG9 q5UNSKI+PV/9ULq/sSDu/0sf1UvXtYeTYKBUlXOOimFcufr1iG60w0HEkfdz5XaO7mCwwkS37ya3e aZbHh8MeyS/uyWAf6se1hdUfzBCvxwlz6x6ShgNEp4qydeiz+GZsZNMgtzY8jegJt1h9Rp90ljP6m BVCP3mXQ==; 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 1wSZB3-0000000GJNl-48lD; Thu, 28 May 2026 11:45:30 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 47189300CB5; Thu, 28 May 2026 13:45:29 +0200 (CEST) Date: Thu, 28 May 2026 13:45:29 +0200 From: Peter Zijlstra To: K Prateek Nayak Cc: Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Aaron Lu , Josh Don , linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/5] sched/fair: Allow account_cfs_rq_runtime() to throttle current hierarchy Message-ID: <20260528114529.GK343181@noisy.programming.kicks-ass.net> References: <20260528094830.13291-1-kprateek.nayak@amd.com> 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: <20260528094830.13291-1-kprateek.nayak@amd.com> On Thu, May 28, 2026 at 09:48:25AM +0000, K Prateek Nayak wrote: > Patches also cleanly apply on top of Zecheng's optimization from [3] > when applied on top of the same base. Peter, there is only one trivial > conflict with sched/flat, and Zecheng's optimization is generally > beneficial for deep hierarchies even with flattened pick. Ah, yes, I had meant to go look at how bad that conflict was, but just hadn't gotten around to it. Let me go have a play.