Messages in this thread | | | Date | Sat, 30 Sep 2006 18:05:48 +0100 | From | Russell King <> | Subject | Re: get_user_pages() cache issues on ARM |
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On Sat, Sep 30, 2006 at 06:59:50PM +0200, Miklos Szeredi wrote: > 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.
-- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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