On Mon, Mar 13, 2006 at 05:14:20PM +0200, Michael S. Tsirkin wrote:
> > > My current thinking then goes vaguely along the lines of:
> > >
> > > We need a way to distinguish the parent from child on COW. A flag in the
> > > VMA
> > > will do it.
> > >
> > And what if child forks ones more?
>
> If COW is already set, we don't set this new flag in VMA.
> When the driver does get_user_pages with child's mm, this will break COW
> so no problem.
>
So we should check each page in VMA for COW? Is it enough to check one
page or should we check all of them? And what if VMA is a
privately mapped file? I think COW will be set on mapped pages.
I should think about this some more.
--
Gleb.
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