From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f173.google.com (mail-pd0-f173.google.com [209.85.192.173]) by kanga.kvack.org (Postfix) with ESMTP id E81D96B02F5 for ; Thu, 16 Jul 2015 06:02:25 -0400 (EDT) Received: by pdrg1 with SMTP id g1so41736506pdr.2 for ; Thu, 16 Jul 2015 03:02:25 -0700 (PDT) Received: from mx2.parallels.com (mx2.parallels.com. [199.115.105.18]) by mx.google.com with ESMTPS id jc8si12108638pbd.251.2015.07.16.03.02.24 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 16 Jul 2015 03:02:24 -0700 (PDT) Date: Thu, 16 Jul 2015 13:02:11 +0300 From: Vladimir Davydov Subject: Re: [PATCH -mm v8 0/7] idle memory tracking Message-ID: <20150716100211.GC2001@esperanza> References: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Andres Lagar-Cavilla Cc: Andrew Morton , Minchan Kim , Raghavendra K T , Johannes Weiner , Michal Hocko , Greg Thelen , Michel Lespinasse , David Rientjes , Pavel Emelyanov , Cyrill Gorcunov , Jonathan Corbet , linux-api@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org On Wed, Jul 15, 2015 at 01:47:15PM -0700, Andres Lagar-Cavilla wrote: > I think the remaining question here is performance. > > Have you conducted any studies where > - there is a workload > - a daemon is poking kpageidle every N seconds/minutes > - what is the daemon cpu consumption? > - what is the workload degradation if any? > > N candidates include 30 seconds, 1 minute, 2 minutes, 5 minutes.... > > Workload candidates include TPC, spec int memory intensive things like > 429.mcf, stream (http://www.cs.virginia.edu/stream/ "sustainable > memory bandwidth" vs floating point performance) > > I'm not asking for a research paper, but if, say, a 2 minute-period > daemon introduces no degradation and adds up to a minute of cpu per > hour, then we're golden. Fair enough. Will do that soon and report back. Thanks a lot for the review, it was really helpful! Vladimir -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org