Messages in this thread | | | Date | Thu, 10 Nov 2005 13:21:25 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: Nick's core remove PageReserved broke vmware... |
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On Thu, 10 Nov 2005, Michael S. Tsirkin wrote: > Quoting Gleb Natapov <gleb@minantech.com>: > > 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.
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