Re: Nick's core remove PageReserved broke vmware...

[Gleb Natapov]

On Mon, Nov 14, 2005 at 02:25:35PM +0200, Michael S. Tsirkin wrote:
> Quoting Hugh Dickins <hugh@xxxxxxxxxxx>:
> > 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().

--
			Gleb.
-
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/