From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f200.google.com (mail-wr0-f200.google.com [209.85.128.200]) by kanga.kvack.org (Postfix) with ESMTP id 7CF306B03A0 for ; Thu, 13 Apr 2017 12:03:50 -0400 (EDT) Received: by mail-wr0-f200.google.com with SMTP id n5so6746383wrb.7 for ; Thu, 13 Apr 2017 09:03:50 -0700 (PDT) Received: from gum.cmpxchg.org (gum.cmpxchg.org. [85.214.110.215]) by mx.google.com with ESMTPS id m194si13689299wmb.55.2017.04.13.09.03.48 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 13 Apr 2017 09:03:49 -0700 (PDT) Date: Thu, 13 Apr 2017 12:03:43 -0400 From: Johannes Weiner Subject: Re: [RFC 0/1] add support for reclaiming priorities per mem cgroup Message-ID: <20170413160343.GC29727@cmpxchg.org> References: <20170317231636.142311-1-timmurray@google.com> <20170330155123.GA3929@cmpxchg.org> 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: Shakeel Butt Cc: Tim Murray , Michal Hocko , Vladimir Davydov , LKML , cgroups@vger.kernel.org, Linux MM , surenb@google.com, totte@google.com, kernel-team@android.com On Thu, Mar 30, 2017 at 09:48:55AM -0700, Shakeel Butt wrote: > > A more useful metric for memory pressure at this point is quantifying > > that time you spend thrashing: time the job spends in direct reclaim > > and on the flipside time the job waits for recently evicted pages to > > come back. Combined, that gives you a good measure of overhead from > > memory pressure; putting that in relation to a useful baseline of > > meaningful work done gives you a portable scale of how effictively > > your job is running. > > > > I'm working on that right now, hopefully I'll have something useful > > soon. > > Johannes, is the work you are doing only about file pages or will it > equally apply to anon pages as well? It will work on both, with the caveat that *any* swapin is counted as memory delay, whereas only cache misses of recently evicted entries count toward it (we don't have timestamped shadow entries for anon). -- 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