James Bottomley <[EMAIL PROTECTED]> wrote:
>
> > > OK, I confess to not ever having looked at that ... does it use
> > > get_user_pages() as well?
> >
> > I believe so, Andrew knows...
>
> OK I'll wait to see what he says.
<he'd made some procmailrc changes and had thought that linux-arch was
rather quiet lately>
Yes, direct-io does get_user_pages() and then uses submit_bio() to
read/write the pages.
So it should fall under
2) device DMA, where the L2 cache eviction done by the device DMA
will pull out the D-cache entries, or if the block I/O is via PIO
it will do cache flushing in there, as per some asm-*/ide.h
implementations of __ide_ins*()/__ide_outs*()
umm, except in the case where direct-io hit a file hole. In that case we
memset the user's page and use flush_dcache_page(). And that's most likely
an anonymous page.
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