linux-kernel - Re: fuse, get_user_pages, flush_anon_page, aliasing caches and all that again

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Date:	Sun, 31 Dec 2006 13:24:53 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	rmk+lkml@....linux.org.uk
CC:	davem@...emloft.net, arjan@...radead.org, torvalds@...l.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	akpm@...l.org
Subject: Re: fuse, get_user_pages, flush_anon_page, aliasing caches and all that again

> I'm willing to do that - and I guess this means we can probably do this
> instead of walking the list of VMAs for the shared mapping, thereby
> hitting both anonymous and shared mappings with the same code?

But for the get_user_pages() case there's no point, is there?  The VMA
and the virtual address is already available, so trying to find it
again through RMAP doesn't much make sense.

Users of get_user_pages() don't care about any other mappings (maybe
ptrace does, I don't know) only about one single user mapping and one
kernel mapping.

So using flush_dcache_page() there is an overkill, trying to teach it
about anonymous pages is not the real solution, flush_dcache_page()
was never meant to be used on anything but file mapped pages.

Miklos
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