On Thu, Nov 10, 2005 at 01:21:25PM +0000, Hugh Dickins wrote:
> On Thu, 10 Nov 2005, Michael S. Tsirkin wrote:
> > Quoting Gleb Natapov <[email protected]>:
> > > On Thu, Nov 10, 2005 at 02:48:53PM +0200, Michael S. Tsirkin wrote:
> > > > > Also perhapse we should skip VM_SHARED VMAs?
> > > >
> > > > Why?
> > > >
> > > They will work correctly across fork().
> >
> > So why would I call madvise on such a VMA?
>
> To avoid the overhead of forking it e.g. if it's a large nonlinear vma,
> a lot of time may be wasted on copying its ptes for fork. That's one
> of the reasons I came to like your DONTCOPY.
>
> So, it may not be useful for your particular RDMA issue, but I see no
> reason to exclude VM_SHARED vmas from the madvise, and good reason to
> include them.
>
If the scope of DONTCOPY is more broad that just RDMA then I agree.
--
Gleb.
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