linux-kernel - Re: [PATCH 00/16] mm: prepare for converting vm->vm

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Message-ID: <4F6DE172.7010604@openvz.org>
Date:	Sat, 24 Mar 2012 19:00:02 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>
Subject: Re: [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit

Konstantin Khlebnikov wrote:
> Benjamin Herrenschmidt wrote:
>> On Thu, 2012-03-22 at 14:39 +0900, Minchan Kim wrote:
>>> I think we can also unify VM_MAPPED_COPY(nommu) and VM_SAO(powerpc)
>>> with one VM_ARCH_1
>>> Okay. After this series is merged, let's try to remove flags we can
>>> do. Then, other guys
>>> might suggest another ideas.
>>
>> Agreed. I would like more VM_ARCH while at it :-)
>
> Currently I see here four architecture-specific flags =)
>
> VM_ARCH_1 VM_ARCH_2 VM_ARCH_3 VM_ARCH_4
> x86 VM_NOHUGEPAGE VM_HUGEPAGE - VM_PFN_AT_MMAP
> powerpc - - VM_SAO -
> parisc VM_GROWSUP - - -
> ia64 VM_GROWSUP - - -
> nommu - VM_MAPPED_COPY - -
>
> Obviously we can combine VM_PFN_AT_MMAP, VM_SAO, VM_GROWSUP and VM_MAPPED_COPY into one.

Also logic and usage of VM_IO, VM_RESERVED, VM_PFNMAP, VM_MIXEDMAP,
VM_INSERTPAGE, VM_DONTEXPAND and VM_DONTCOPY are very messy.
I think some of them can be replaced with two flags:
VM_SPECIAL_PFN and VM_SPECIAL_PAGE, or something like this.
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