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 C709F1E049C for ; Thu, 7 Nov 2024 14:10:01 +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=1730988604; cv=none; b=DmcZCKKmrSRyNy15N03rieWfMF7fSKDOOuKTzmcYoIoG88MZYBDgLtCVU75qN7/SKoudnELslPqToitzSkC/hYRl+sGF2xoxIfbTsAwqFaZ83eSUFWB7gfGtFWOBMFr2/NKgyTwXUaK2cmpWjCqg6gfaQhHoWMy64caU1taY7G0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730988604; c=relaxed/simple; bh=tHjFq+/O19qv89wgRqbvlqo6SSp58vCEdx28oCQlBJc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=BhXFNl9HxvFxDFClsH9ATTtB1Rjy7kuSmIItlHB87NFaU0PR90zrtdoWCUg3b3+K/sDDLcy/+tcoelvysBEc3MBO0bpAkP27V1vvEDm3OxHu51P9c1XJUq7XPuHO0tQ1J0NOHSer3rLa53lYYYf1V0j3dYCX4CF4VMrWzCs5Kb0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (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=hL4c5O4/; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (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="hL4c5O4/" 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=G6CNBA3+KEhWUklW0A3SaT/tzIPRGpTeEqARX2gKGac=; b=hL4c5O4/kUaatkivHjsnsEix4v vAHBe5F5KQGb3H70jNmYd5MCRkh1T2HgAPQteM98OCp8YEvuTCUvQ2XOOQgqWeC5Y0tNUGN8Kl9A9 3skzym5Sr2+QFB1sOg45xPRNOAkaK2GJgDpsGvx8h/WU7xliBzuqj64mXK3E+KaL2R3yDL6BEgXAy IzJj1MS0PruDAE9/rMIVm2X/iagroSv0/x1wJ8W1ndtZ4Xezs/DrwrN+lHvdiKHR1uzfs6FITZI6s mj7lVd9s6mwFewQ/sJtCviwtxxwXYXwLSVJUIzFpxys5yVdnByp8MCqZDaxNf/6tziJSpPDOo8D9J EVnMbSEw==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1t93Ck-0000000C8j1-0iQt; Thu, 07 Nov 2024 14:09:46 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 665123006AB; Thu, 7 Nov 2024 15:09:45 +0100 (CET) Date: Thu, 7 Nov 2024 15:09:45 +0100 From: Peter Zijlstra To: Mike Galbraith Cc: Phil Auld , mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, linux-kernel@vger.kernel.org, kprateek.nayak@amd.com, wuyun.abel@bytedance.com, youssefesmat@chromium.org, tglx@linutronix.de Subject: Re: [PATCH 17/24] sched/fair: Implement delayed dequeue Message-ID: <20241107140945.GA34695@noisy.programming.kicks-ass.net> References: <20241101200704.GE689589@pauld.westford.csb> <59355fae66255a92f2cbc4d7ed38368ff3565140.camel@gmx.de> <20241104130515.GB749675@pauld.westford.csb> <1bffa5f2ca0fec8a00f84ffab86dc6e8408af31c.camel@gmx.de> <20241106135346.GL24862@noisy.programming.kicks-ass.net> <20241106141420.GZ33184@noisy.programming.kicks-ass.net> <982456f0abca321b874b7974bdf17d1a605c3d38.camel@gmx.de> <5280774bce7343c43904ae3df4403942092f5562.camel@gmx.de> 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: <5280774bce7343c43904ae3df4403942092f5562.camel@gmx.de> On Thu, Nov 07, 2024 at 03:02:36PM +0100, Mike Galbraith wrote: > On Thu, 2024-11-07 at 10:46 +0100, Mike Galbraith wrote: > > On Thu, 2024-11-07 at 05:03 +0100, Mike Galbraith wrote: > > > > > > I built that patch out of curiosity, and yeah, set_next_task_fair() > > > finding a cfs_rq->curr ends play time pretty quickly. > > > > The below improved uptime, and trace_printk() says it's doing the > > intended, so I suppose I'll add a feature and see what falls out. > > From netperf, I got.. number tabulation practice. Three runs of each > test with and without produced nothing but variance/noise. Make it go away then. If you could write a Changelog for you inspired bit and stick my cleaned up version under it, I'd be much obliged.