linux-kernel - Re: [PATCH RFC] fadvise: move active pages to inactive list with POSIX_FADV

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Message-ID: <4E081764.7040709@jp.fujitsu.com>
Date:	Mon, 27 Jun 2011 14:38:44 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	P@...igBrady.com
CC:	andrea@...terlinux.com, akpm@...ux-foundation.org,
	minchan.kim@...il.com, riel@...hat.com, peterz@...radead.org,
	hannes@...xchg.org, kamezawa.hiroyu@...fujitsu.com,
	aarcange@...hat.com, hughd@...gle.com, jamesjer@...terlinux.com,
	marcus@...ehost.com, matt@...ehost.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] fadvise: move active pages to inactive list with
 POSIX_FADV_DONTNEED

> Hmm, What if you do want to evict it from the cache for testing purposes?
> Perhaps this functionality should be associated with POSIX_FADV_NOREUSE?
> dd has been recently modified to support invalidating the cache for a file,
> and it uses POSIX_FADV_DONTNEED for that.
> http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=commitdiff;h=5f311553

This change don't break dd. dd don't have a special privilege of file cache
dropping if it's also used by other processes.

if you want to drop a cache forcely (maybe for testing), you need to use
/proc/sys/vm/drop_caches. It's ok to ignore other processes activity because
it's privilege operation.

Thanks.

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