linux-kernel - Re: [PATCH] mm: page_alloc: High-order per-cpu page allocator v3

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Message-ID: <20161128184758.bcz5ar5svv7whnqi@techsingularity.net>
Date:   Mon, 28 Nov 2016 18:47:58 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Christoph Lameter <cl@...ux.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Johannes Weiner <hannes@...xchg.org>,
        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 v3

On Mon, Nov 28, 2016 at 10:38:58AM -0600, Christoph Lameter wrote:
> > > that only insiders know how to tune and an overall fragile solution.
> > While I agree with all of this, it's also a problem independent of this
> > patch.
> 
> It is related. The fundamental issue with fragmentation remain and IMHO we
> really need to tackle this.
> 

Fragmentation is one issue. Allocation scalability is a separate issue.
This patch is about scaling parallel allocations of small contiguous
ranges. Even if there were fragmentation-related patches up for discussion,
they would not be directly affected by this patch.

If you have a series aimed at parts of the fragmentation problem or how
subsystems can avoid tracking 4K pages in some important cases then by
all means post them.

-- 
Mel Gorman
SUSE Labs