On Wed, Feb 15, 2006 at 05:18:42PM +0200, Michael S. Tsirkin wrote:
> Quoting r. Gleb Natapov <[EMAIL PROTECTED]>:
> > > > Because the program should be careful to not put the data it needs in
> > > > the
> > > > same page with registered buffer.
> > >
> > > It should? Why should it?
> >
> > Because after fork it may not find it. (But somehow I think you know
> > that.)
>
> I dont. The private data will get COWed properly - its only with DMA
> data that we have a problem. No?
>
Suppose you have this code:
char buf[1000];
char *prog="/bin/true";
main()
{
reg_mr (buf, 1000);
madvise (buf, 1000, DONTCOPY);
system (prog);
}
if buf and prog are on the same page (most certainly) "/bin/true" will
never run.
--
Gleb.
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