Re: [PATCH 01/10] ksm: add mmu_notifier set_pte_at_notify()

[Rik van Riel]

Izik Eidus wrote:
> From: Izik Eidus <ieidus@xxxxxxxxxx>
>
> The set_pte_at_notify() macro allows setting a pte in the shadow page
> table directly, instead of flushing the shadow page table entry and then
> getting vmexit to set it.  It uses a new change_pte() callback to do so.
>
> set_pte_at_notify() is an optimization for kvm, and other users of
> mmu_notifiers, for COW pages.  It is useful for kvm when ksm is used,
> because it allows kvm not to have to receive vmexit and only then map
> the ksm page into the shadow page table, but instead map it directly
> at the same time as Linux maps the page into the host page table.
>
> Users of mmu_notifiers who don't implement new mmu_notifier_change_pte()
> callback will just receive the mmu_notifier_invalidate_page() callback.
>
> Signed-off-by: Izik Eidus <ieidus@xxxxxxxxxx>
> Signed-off-by: Chris Wright <chrisw@xxxxxxxxxx>
> Signed-off-by: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

--
All rights reversed.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/