linux-kernel - Re: [PATCH] mm: add parameter to disable faultaround

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Message-Id: <20141124230502.30f9b6f0.akpm@linux-foundation.org>
Date:	Mon, 24 Nov 2014 23:05:02 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Chanho Min <chanho.min@....com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>, Michal Hocko <mhocko@...e.cz>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	HyoJun Im <hyojun.im@....com>, Gunho Lee <gunho.lee@....com>,
	Wonhong Kwon <wonhong.kwon@....com>
Subject: Re: [PATCH] mm: add parameter to disable faultaround

On Tue, 25 Nov 2014 15:51:58 +0900 Chanho Min <chanho.min@....com> wrote:

> The faultaround improves the file read performance, whereas pages which
> can be dropped by drop_caches are reduced. On some systems, The amount of
> freeable pages under memory pressure is more important than read
> performance.

The faultaround pages *are* freeable.  Perhaps you meant "free" here.

Please tell us a great deal about the problem which you are trying to
solve.  What sort of system, what sort of workload, what is bad about
the behaviour which you are observing, etc.


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