linux-kernel - Re: cache alias in mmap + write

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Message-ID: <979dd0561001201906j5acedd8ay42d7bc68beefbb9e@mail.gmail.com>
Date:	Thu, 21 Jan 2010 11:06:03 +0800
From:	anfei zhou <anfei.zhou@...il.com>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux@....linux.org.uk
Subject: Re: cache alias in mmap + write

On Thu, Jan 21, 2010 at 9:32 AM, Jamie Lokier <jamie@...reable.org> wrote:
> KOSAKI Motohiro wrote:
>>  2. Add some commnet. almost developer only have x86 machine. so, arm
>>     specific trick need additional explicit explanation. otherwise anybody
>>     might break this code in the future.
>
> That's Documentation/cachetlb.txt.
>
> What's being discussed here is not ARM-specific, although it appears
> maintainers of different architecture (ARM and MIPS for a start) may
> have different ideas about what they are guaranteeing to userspace.
> It sounds like MIPS expects userspace to use msync() sometimes (even
> though Linux msync(MS_INVALIDATE) is quite broken), and ARM expects to
> to keep mappings coherent automatically (which is sometimes slower
> than necessary, but usually very helpful).
>
>>  3. Resend the patch. original mail isn't good patch format. please
>>  consider to reduce akpm suffer.
>
> This type of change in generic code would need review from a number of
> architecture maintainers, I'd expect.
>
So should I broadcast this mail in order to get their attentions,
linux-arch@...r.kernel.org?

Thanks!
> -- Jamie
>
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