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

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Message-ID: <515F42EE.8060203@linux.vnet.ibm.com>
Date:	Fri, 05 Apr 2013 17:32:30 -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

Well, I have the "is_dup_page()" commented out.......when RDMA is 
activated.....

Is there something else in QEMU that could be touching the page that I 
don't know about?

- Michael


On 04/05/2013 05:03 PM, Roland Dreier wrote:
> On Fri, Apr 5, 2013 at 1:51 PM, Michael R. Hines
> <mrhines@...ux.vnet.ibm.com> wrote:
>> Sorry, I was wrong. ignore the comments about cgroups. That's still broken.
>> (i.e. trying to register RDMA memory while using a cgroup swap limit cause
>> the process get killed).
>>
>> But the GIFT flag patch works (my understanding is that GIFT flag allows the
>> adapter to transmit stale memory information, it does not have anything to
>> do with cgroups specifically).
> The point of the GIFT patch is to avoid triggering copy-on-write so
> that memory doesn't blow up during migration.  If that doesn't work
> then there's no point to the patch.
>
>   - R.
>

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