linux-kernel - Re: [PATCH 05/14] vrange: Add new vrange(2) system call

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Message-ID: <52535EE1.3060700@zytor.com>
Date:	Mon, 07 Oct 2013 18:24:49 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Minchan Kim <minchan@...nel.org>
CC:	John Stultz <john.stultz@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Robert Love <rlove@...gle.com>, Mel Gorman <mel@....ul.ie>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Rik van Riel <riel@...hat.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Dave Chinner <david@...morbit.com>, Neil Brown <neilb@...e.de>,
	Andrea Righi <andrea@...terlinux.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Mike Hommey <mh@...ndium.org>, Taras Glek <tglek@...illa.com>,
	Dhaval Giani <dhaval.giani@...il.com>, Jan Kara <jack@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Michel Lespinasse <walken@...gle.com>,
	Rob Clark <robdclark@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 05/14] vrange: Add new vrange(2) system call

On 10/07/2013 05:13 PM, Minchan Kim wrote:
>>
>> The point is that MADV_DONTNEED is very similar in that sense,
>> especially if allowed to be lazy.  It makes a lot of sense to permit
>> both scrubbing modes orthogonally.
>>
>> The point you're making has to do with withdrawal of permission to flush
>> on demand, which is a result of having the lazy mode (ongoing
>> permission) and having to be able to withdraw such permission.
> 
> I'm sorry I could not understand what you wanted to say.
> Could you elaborate a bit?
> 

Basically, you need this because of MADV_LAZY or the equivalent, so it
would be applicable to a similar variant of madvise().

As such I would suggest that an madvise4() call would be appropriate.

	-hpa


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