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From: "Wang, Wei W" <wei.w.wang@intel.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: "virtio-dev@lists.oasis-open.org"
	<virtio-dev@lists.oasis-open.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"virtualization@lists.linux-foundation.org"
	<virtualization@lists.linux-foundation.org>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"mhocko@kernel.org" <mhocko@kernel.org>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"pbonzini@redhat.com" <pbonzini@redhat.com>,
	"liliang.opensource@gmail.com" <liliang.opensource@gmail.com>,
	"yang.zhang.wz@gmail.com" <yang.zhang.wz@gmail.com>,
	"quan.xu0@gmail.com" <quan.xu0@gmail.com>,
	"nilal@redhat.com" <nilal@redhat.com>,
	"riel@redhat.com" <riel@redhat.com>,
	"huangzhichao@huawei.com" <huangzhichao@huawei.com>
Subject: RE: [PATCH v30 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT
Date: Thu, 5 Apr 2018 02:05:03 +0000	[thread overview]
Message-ID: <286AC319A985734F985F78AFA26841F7394A7F3B@shsmsx102.ccr.corp.intel.com> (raw)
In-Reply-To: <20180405040900-mutt-send-email-mst@kernel.org>

On Thursday, April 5, 2018 9:12 AM, Michael S. Tsirkin wrote:
> On Thu, Apr 05, 2018 at 12:30:27AM +0000, Wang, Wei W wrote:
> > On Wednesday, April 4, 2018 10:08 PM, Michael S. Tsirkin wrote:
> > > On Wed, Apr 04, 2018 at 10:07:51AM +0800, Wei Wang wrote:
> > > > On 04/04/2018 02:47 AM, Michael S. Tsirkin wrote:
> > > > > On Wed, Apr 04, 2018 at 12:10:03AM +0800, Wei Wang wrote:
> > I'm afraid the driver couldn't be aware if the added hints are stale
> > or not,
> 
> 
> No - I mean that driver has code that compares two values and stops
> reporting. Can one of the values be stale?

The driver compares "vb->cmd_id_use != vb->cmd_id_received" to decide if it needs to stop reporting hints, and cmd_id_received is what the driver reads from host (host notifies the driver to read for the latest value). If host sends a new cmd id, it will notify the guest to read again. I'm not sure how that could be a stale cmd id (or maybe I misunderstood your point here?)

Best,
Wei

  reply	other threads:[~2018-04-05  2:05 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-03 16:10 [PATCH v30 0/4] Virtio-balloon: support free page reporting Wei Wang
2018-04-03 16:10 ` [PATCH v30 1/4] mm: support reporting free page blocks Wei Wang
2018-04-03 16:10 ` [PATCH v30 2/4] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT Wei Wang
2018-04-03 18:47   ` Michael S. Tsirkin
2018-04-04  2:07     ` Wei Wang
2018-04-04 14:07       ` Michael S. Tsirkin
2018-04-05  0:30         ` Wang, Wei W
2018-04-05  1:12           ` Michael S. Tsirkin
2018-04-05  2:05             ` Wang, Wei W [this message]
2018-04-05 14:03               ` Michael S. Tsirkin
2018-04-05 15:47                 ` Wang, Wei W
2018-04-05 18:30                   ` Michael S. Tsirkin
2018-04-06  0:11                     ` Wang, Wei W
2018-04-03 16:10 ` [PATCH v30 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules Wei Wang
2018-04-03 16:10 ` [PATCH v30 4/4] virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON Wei Wang

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