linux-kernel - Re: [PATCH 2/6] mm: mlocking in try_to_unmap

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Message-Id: <20091114025202.3DAB.A69D9226@jp.fujitsu.com>
Date:	Sat, 14 Nov 2009 03:00:59 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Izik Eidus <ieidus@...hat.com>, Nick Piggin <npiggin@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 2/6] mm: mlocking in try_to_unmap_one

> On Fri, Nov 13, 2009 at 05:26:14PM +0900, KOSAKI Motohiro wrote:
> > Probably we can remove VM_NONLINEAR perfectly. I've never seen real user of it.
> 
> Do you mean as a whole or in the mlock logic? databases are using
> remap_file_pages on 32bit archs to avoid generating zillon of vmas on
> tmpfs scattered mappings. On 64bits it could only be useful to some
> emulators but with real shadow paging and nonlinear rmap already
> created on shadow pagetables, it looks pretty useless on 64bit archs
> to me.

Hehe, you point out kosaki is stupid and knoledgeless.
thanks correct me.

Probaby we have to maintain VM_NONLINEAR for one or two year. two years
later, nobody use database on 32bit machine.
(low-end DB might be use on 32bit, but that's ok. it doesn't use VM_NONLINEAR)




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