Avi Kivity wrote:
This sample patch adds a new mechanism, pte notifiers, that allows drivers
to register an interest in a changes to ptes. Whenever Linux changes a
pte, it will call a notifier to allow the driver to adjust the external
page table and flush its tlb.
Note that only one notifier is implemented, ->clear(), but others should be
similar.
This approach makes a lot of sense.
diff --git a/mm/rmap.c b/mm/rmap.c
index 41ac397..3f61d38 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -682,6 +682,7 @@ static int try_to_unmap_one(struct page *page, struct
vm_area_struct *vma,
}
/* Nuke the page table entry. */
+ pte_notifier_call(vma, clear, address);
flush_cache_page(vma, address, page_to_pfn(page));
pteval = ptep_clear_flush(vma, address, pte);
If you want this to be useful to Infiniband, you should probably
also hook up do_wp_page() in mm/memory.c, where a page table can
be pointed to another page.
Probably the code in mm/mremap.c will need to be hooked up too.
--
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is. Each group
calls the other unpatriotic.
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