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

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Message-ID: <525347BE.7040606@zytor.com>
Date:	Mon, 07 Oct 2013 16:46:06 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	John Stultz <john.stultz@...aro.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan@...nel.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 04:41 PM, John Stultz wrote:
> 
> You mark a chunk of memory as volatile, then at some point later, mark
> its as non-volatile. The purge state tells you if the memory is still
> there, or if we threw it out due to memory pressure. This lets the
> application regnerate the purged data before continuing on.
> 

And wouldn't this apply to MADV_DONTNEED just as well?  Perhaps what we
should do is an enhanced madvise() call?

	-hpa


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