From: "Michael S. Tsirkin" <mst@redhat.com>
To: Roland Dreier <roland@kernel.org>
Cc: qemu-devel@nongnu.org,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
Yishai Hadas <yishaih@mellanox.com>,
LKML <linux-kernel@vger.kernel.org>,
"Michael R. Hines" <mrhines@linux.vnet.ibm.com>,
Hal Rosenstock <hal.rosenstock@gmail.com>,
Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
Sean Hefty <sean.hefty@intel.com>,
Christoph Lameter <cl@linux.com>
Subject: Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag
Date: Tue, 9 Apr 2013 22:12:18 +0300 [thread overview]
Message-ID: <20130409191218.GD8212@redhat.com> (raw)
In-Reply-To: <CAL1RGDU2jtrRrxi6srsH_ADiYGvJbCpCT3UvoLGTX3cvQ=s0kQ@mail.gmail.com>
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
next prev parent reply other threads:[~2013-04-09 20:23 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-24 15:51 [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag Michael S. Tsirkin
2013-04-02 15:51 ` Michael S. Tsirkin
2013-04-02 16:57 ` Roland Dreier
2013-04-02 17:05 ` Michael S. Tsirkin
2013-04-02 22:17 ` Michael R. Hines
2013-04-03 16:07 ` Michael S. Tsirkin
2013-04-05 20:17 ` Michael R. Hines
2013-04-05 20:43 ` Roland Dreier
2013-04-05 20:51 ` Michael R. Hines
2013-04-05 21:03 ` Roland Dreier
2013-04-05 21:32 ` Michael R. Hines
2013-04-09 19:03 ` Michael S. Tsirkin
2013-04-10 1:26 ` Michael R. Hines
2013-04-10 3:24 ` Michael S. Tsirkin
2013-04-10 4:32 ` Michael R. Hines
2013-04-10 5:32 ` Michael S. Tsirkin
2013-04-10 15:48 ` Michael R. Hines
2013-04-10 15:05 ` Michael S. Tsirkin
2013-04-10 16:28 ` Michael R. Hines
2013-04-09 19:09 ` Michael S. Tsirkin
2013-04-05 20:54 ` Michael R. Hines
2013-04-09 16:39 ` Michael S. Tsirkin
2013-04-09 17:56 ` Michael R. Hines
2013-04-09 19:00 ` Michael S. Tsirkin
2013-04-09 19:12 ` Michael S. Tsirkin [this message]
2013-04-09 20:34 ` Michael S. Tsirkin
2013-04-09 20:37 ` Michael S. Tsirkin
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