Messages in this thread | | | Subject | Re: get_user_pages() cache issues on ARM | From | Miklos Szeredi <> | Date | Sat, 30 Sep 2006 19:18:34 +0200 |
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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. - 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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