Messages in this thread | | | From | Roland Dreier <> | Date | Thu, 21 Mar 2013 02:13:38 -0700 | Subject | Re: [PATCH] rdma: don't make pages writeable if not requiested |
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On Thu, Mar 21, 2013 at 1:51 AM, Michael S. Tsirkin <mst@redhat.com> wrote: >> In that case, no, I don't see any reason for LOCAL_WRITE, since the >> only RDMA operations that will access this memory are remote reads. > > What is the meaning of LOCAL_WRITE then? There are no local > RDMA writes as far as I can see.
Umm, it means you're giving the local adapter permission to write to that memory. So you can use it as a receive buffer or as the target for remote data from an RDMA read operation.
> OK then what we need is a new flag saying "I really do not > intend to write into this memory please do not break > COW or do anything else just in case I do".
Isn't that a shared read-only mapping?
- R.
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