linux-kernel - Re: [PATCH] mm: page_alloc: High-order per-cpu page allocator v7

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Message-ID: <alpine.DEB.2.20.1612071037480.11056@east.gentwo.org>
Date:   Wed, 7 Dec 2016 10:40:47 -0600 (CST)
From:   Christoph Lameter <cl@...ux.com>
To:     Mel Gorman <mgorman@...hsingularity.net>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Johannes Weiner <hannes@...xchg.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Linux-MM <linux-mm@...ck.org>,
        Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: page_alloc: High-order per-cpu page allocator v7

On Wed, 7 Dec 2016, Mel Gorman wrote:

> Which is related to the fundamentals of fragmentation control in
> general. At some point there will have to be a revisit to get back to
> the type of reliability that existed in 3.0-era without the massive
> overhead it incurred. As stated before, I agree it's important but
> outside the scope of this patch.

What reliability issues are there? 3.X kernels were better in what
way? Which overhead are we talking about?

Fragmentation has been a problem for a long time and the issue gets worse
as memory sizes increase, the hardware improves and the expectations on
throughput and reliability increase.