linux-kernel - Re: [RFC PATCH] ARM: Assume new page cache pages have dirty D-cache

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Date:	Fri, 05 Mar 2010 15:32:09 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH] ARM: Assume new page cache pages have dirty D-cache


> As I just realised, this is going to subject all pages placed into
> userspace with a D cache flush - even anonymous pages, and those
> which we've been careful to deal with the cache issues already (eg,
> via the COW page copying code.)
> 
> I think all the copypage functions need to set PG_dcache_clean on the
> new pages once their copy has completed.
> 
> I wonder if there's any other anonymous page creating functions which
> could do with a similar treatment...

Do we do anything other than COW and zero page ? clear_user_page() I
suppose could deal with that if you do the cache bits there.

Cheers,
Ben.

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