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Date: Sun, 25 Mar 2012 11:55:52 +0400
From: Konstantin Khlebnikov <khlebnikov@openvz.org>
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To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Minchan Kim <minchan@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
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        Linus Torvalds <torvalds@linux-foundation.org>,
        Hugh Dickins <hughd@google.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        "linux@arm.linux.org.uk" <linux@arm.linux.org.uk>
Subject: Re: [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit
References: <20120321065140.13852.52315.stgit@zurg>  <20120321100602.GA5522@barrios> <4F69D496.2040509@openvz.org>  <20120322053958.GA5278@barrios> <1332397358.2982.82.camel@pasglop>  <4F6DDE56.3090401@openvz.org> <1332633000.2882.15.camel@pasglop>
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Benjamin Herrenschmidt wrote:
> On Sat, 2012-03-24 at 18:46 +0400, Konstantin Khlebnikov wrote:
>> Obviously we can combine VM_PFN_AT_MMAP, VM_SAO, VM_GROWSUP and
>> VM_MAPPED_COPY into one.
>
> VM_PFN_AT_MMAP isn't arch specific afaik...

Technically yes, but all this pfnmap-tracking engine has only one user: x86 PAT.
We can easily make it x86-only, or try to implement it without using special flag on vma.

>
> Cheers,
> Ben.
>
>