linux-kernel - Re: [PATCH] mm: readahead: do not cap readahead() and MADV

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Message-ID: <20160229210339.GA15095@node.shutemov.name>
Date:	Tue, 1 Mar 2016 00:03:40 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kernel-team <kernel-team@...com>
Subject: Re: [PATCH] mm: readahead: do not cap readahead() and MADV_WILLNEED

On Mon, Feb 29, 2016 at 02:41:59PM -0500, Johannes Weiner wrote:
> That, or switch to read() from a separate thread for cache priming.

mmap(MAP_POPULATE) would save you some copy_to_user() overhead, comparing
to read().

-- 
 Kirill A. Shutemov