Hi Mel, Benjamin, Jeff,
On 05/13/2013 11:01 PM, Benjamin LaHaise wrote:
On Mon, May 13, 2013 at 10:54:03AM -0400, Jeff Moyer wrote:
How do you propose to move the ring pages?
It's the same problem as doing a TLB shootdown: flush the old pages from
userspace's mapping, copy any existing data to the new pages, then
repopulate the page tables. It will likely require the addition of
address_space_operations for the mapping, but that's not too hard to do.
I think we add migrate_unpin() callback to decrease page->count if
necessary,
and migrate the page to a new page, and add migrate_pin() callback to pin
the new page again.
The migrate procedure will work just as before. We use callbacks to
decrease
the page->count before migration starts, and increase it when the migration
is done.
And migrate_pin() and migrate_unpin() callbacks will be added to
struct address_space_operations.
Is that right ?
If so, I'll be working on it.
Thanks. :)
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