Messages in this thread | | | Date | Tue, 9 Apr 2013 22:12:18 +0300 | From | "Michael S. Tsirkin" <> | Subject | Re: [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag |
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On Fri, Apr 05, 2013 at 01:43:49PM -0700, Roland Dreier wrote: > On Fri, Apr 5, 2013 at 1:17 PM, Michael R. Hines > <mrhines@linux.vnet.ibm.com> wrote: > > I also removed the IBV_*_WRITE flags on the sender-side and activated > > cgroups with the "memory.memsw.limit_in_bytes" activated and the migration > > with RDMA also succeeded without any problems (both with *and* without GIFT > > also worked). > > Not sure I'm interpreting this correctly. Are you saying that things > worked without actually setting the GIFT flag? In which case why are > we adding this flag? > > - R.
We are adding the flag to reduce memory when there's lots of COW pages. There's no guarantee there will be COW pages so I expect things to work both with and without breaking COW, just using much more memory when we break COW.
-- MST
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