Re: get_user_pages() cache issues on ARM
- From: Miklos Szeredi <miklos@xxxxxxxxxx>
- Date: Sat, 30 Sep 2006 19:18:34 +0200
Added James Bottomley to the CC. He designed this interface, and he
explained to me how it's supposed to work, but I since forgot.
James, do you have some memory of these issues?
Thanks,
Miklos
-Hi Russell,
The get_user_pages() vs dcache coherency issue still seems to be
unresolved on ARM.
See flush_anon_page() and flush_kernel_dcache_page() in
Documentation/cachetlb.txt and their implementation on PARISC.
Can you please take a look at this?
I'm sorry, I don't think I have sufficient understanding of the Linux VM
to look at these issues anymore.
The questions I have are:
- where do these pages that get_user_pages() finds and calls flush_anon_page()
on come from?
- why is the current ARM flush_dcache_page() (which is also called after
flush_anon_page()) not sufficient?
- if we implement flush_anon_page() does that mean that we end up flushing
multiple times in some circumstances? If so, how do we avoid this?
I'm really serious - I no longer understand the Linux VM sufficiently to
get this stuff right.
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- References:
- get_user_pages() cache issues on ARM
- From: Miklos Szeredi
- Re: get_user_pages() cache issues on ARM
- From: Russell King
- get_user_pages() cache issues on ARM
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