linux-kernel - Re: [PATCHv2] rdma: add a new IB_ACCESS

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Message-ID: <515F3A0F.5030507@linux.vnet.ibm.com>
Date:	Fri, 05 Apr 2013 16:54:39 -0400
From:	"Michael R. Hines" <mrhines@...ux.vnet.ibm.com>
To:	Roland Dreier <roland@...nel.org>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Yishai Hadas <yishaih@...lanox.com>,
	Christoph Lameter <cl@...ux.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, qemu-devel@...gnu.org
Subject: Re: [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag

To be more specific, here's what I did:

1. apply kernel module patch - re-insert module
1. QEMU does: ibv_reg_mr(........IBV_ACCESS_GIFT | IBV_ACCESS_REMOTE_READ)
2. Start the RDMA migration
3. Migration completes without any errors

This test does *not* work with a cgroup swap limit, however. The process 
gets killed. (Both with and without GIFT)

- Michael

On 04/05/2013 04:43 PM, Roland Dreier wrote:
> On Fri, Apr 5, 2013 at 1:17 PM, Michael R. Hines
> <mrhines@...ux.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.
>

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