Messages in this thread | | | Date | Mon, 14 Nov 2005 14:27:59 +0200 | From | Gleb Natapov <> | Subject | Re: Nick's core remove PageReserved broke vmware... |
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On Mon, Nov 14, 2005 at 02:25:35PM +0200, Michael S. Tsirkin wrote: > Quoting Hugh Dickins <hugh@veritas.com>: > > Subject: Re: Nick's core remove PageReserved broke vmware... > > > > On Tue, 8 Nov 2005, Michael S. Tsirkin wrote: > > > > > > Hugh, did you have something like the following in mind > > > (this is only boot-tested and only on x86-64)? > > > > Yes, that looks pretty good to me, a few comments below. > > Only another twenty or so architectures to go ;) > > There's one thing that I have thought about: what happens > if I set DONTFORK on a page which already has COW set > (e.g. after fork)? > > It seems that the right thing would be to force a page copy - > otherwise the page can get copied on write. > I thought about it. It should not happen for OpenIB since get_user_pages will break COW for us and I don't think we should complicate DONTFORK implementation by doing break during madvise().
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