MIME-Version: 1.0
In-Reply-To: <20170330155123.GA3929@cmpxchg.org>
References: <20170317231636.142311-1-timmurray@google.com> <20170330155123.GA3929@cmpxchg.org>
From: Shakeel Butt <shakeelb@google.com>
Date: Thu, 30 Mar 2017 09:48:55 -0700
Message-ID: <CALvZod7Dr+YaYcSpUYCMAjotnU4hH=TnZWaL6mbBzLq=O3GJTA@mail.gmail.com>
Subject: Re: [RFC 0/1] add support for reclaiming priorities per mem cgroup
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tim Murray <timmurray@google.com>, Michal Hocko <mhocko@kernel.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>, cgroups@vger.kernel.org,
        Linux MM <linux-mm@kvack.org>, surenb@google.com, totte@google.com,
        kernel-team@android.com
Content-Type: text/plain; charset=UTF-8
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 631
Lines: 13

> 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?