From: "Jürgen Groß" <jgross@suse.com>
To: "Roger Pau Monné" <roger.pau@citrix.com>,
"Paul Durrant" <pdurrant@amazon.com>
Cc: xen-devel@lists.xenproject.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Jens Axboe <axboe@kernel.dk>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: [PATCH v3 4/4] xen-blkback: support dynamic unbind/bind
Date: Thu, 12 Dec 2019 13:04:04 +0100 [thread overview]
Message-ID: <48e2da7d-2bf5-9f2a-0675-366ae8d3ce77@suse.com> (raw)
In-Reply-To: <20191212114616.GC11756@Air-de-Roger>
On 12.12.19 12:46, Roger Pau Monné wrote:
> On Wed, Dec 11, 2019 at 03:29:56PM +0000, Paul Durrant wrote:
>> By simply re-attaching to shared rings during connect_ring() rather than
>> assuming they are freshly allocated (i.e assuming the counters are zero)
>> it is possible for vbd instances to be unbound and re-bound from and to
>> (respectively) a running guest.
>>
>> This has been tested by running:
>>
>> while true;
>> do fio --name=randwrite --ioengine=libaio --iodepth=16 \
>> --rw=randwrite --bs=4k --direct=1 --size=1G --verify=crc32;
>> done
>>
>> in a PV guest whilst running:
>>
>> while true;
>> do echo vbd-$DOMID-$VBD >unbind;
>> echo unbound;
>> sleep 5;
>> echo vbd-$DOMID-$VBD >bind;
>> echo bound;
>> sleep 3;
>> done
>>
>> in dom0 from /sys/bus/xen-backend/drivers/vbd to continuously unbind and
>> re-bind its system disk image.
>>
>> This is a highly useful feature for a backend module as it allows it to be
>> unloaded and re-loaded (i.e. updated) without requiring domUs to be halted.
>> This was also tested by running:
>>
>> while true;
>> do echo vbd-$DOMID-$VBD >unbind;
>> echo unbound;
>> sleep 5;
>> rmmod xen-blkback;
>> echo unloaded;
>> sleep 1;
>> modprobe xen-blkback;
>> echo bound;
>> cd $(pwd);
>> sleep 3;
>> done
>>
>> in dom0 whilst running the same loop as above in the (single) PV guest.
>>
>> Some (less stressful) testing has also been done using a Windows HVM guest
>> with the latest 9.0 PV drivers installed.
>>
>> Signed-off-by: Paul Durrant <pdurrant@amazon.com>
>
> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
>
> Thanks!
>
> Juergen: I guess you will also pick this series and merge it from the
> Xen tree instead of the block one?
Yes.
Juergen
WARNING: multiple messages have this Message-ID (diff)
From: "Jürgen Groß" <jgross@suse.com>
To: "Roger Pau Monné" <roger.pau@citrix.com>,
"Paul Durrant" <pdurrant@amazon.com>
Cc: Jens Axboe <axboe@kernel.dk>,
Stefano Stabellini <sstabellini@kernel.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
xen-devel@lists.xenproject.org,
Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [Xen-devel] [PATCH v3 4/4] xen-blkback: support dynamic unbind/bind
Date: Thu, 12 Dec 2019 13:04:04 +0100 [thread overview]
Message-ID: <48e2da7d-2bf5-9f2a-0675-366ae8d3ce77@suse.com> (raw)
In-Reply-To: <20191212114616.GC11756@Air-de-Roger>
On 12.12.19 12:46, Roger Pau Monné wrote:
> On Wed, Dec 11, 2019 at 03:29:56PM +0000, Paul Durrant wrote:
>> By simply re-attaching to shared rings during connect_ring() rather than
>> assuming they are freshly allocated (i.e assuming the counters are zero)
>> it is possible for vbd instances to be unbound and re-bound from and to
>> (respectively) a running guest.
>>
>> This has been tested by running:
>>
>> while true;
>> do fio --name=randwrite --ioengine=libaio --iodepth=16 \
>> --rw=randwrite --bs=4k --direct=1 --size=1G --verify=crc32;
>> done
>>
>> in a PV guest whilst running:
>>
>> while true;
>> do echo vbd-$DOMID-$VBD >unbind;
>> echo unbound;
>> sleep 5;
>> echo vbd-$DOMID-$VBD >bind;
>> echo bound;
>> sleep 3;
>> done
>>
>> in dom0 from /sys/bus/xen-backend/drivers/vbd to continuously unbind and
>> re-bind its system disk image.
>>
>> This is a highly useful feature for a backend module as it allows it to be
>> unloaded and re-loaded (i.e. updated) without requiring domUs to be halted.
>> This was also tested by running:
>>
>> while true;
>> do echo vbd-$DOMID-$VBD >unbind;
>> echo unbound;
>> sleep 5;
>> rmmod xen-blkback;
>> echo unloaded;
>> sleep 1;
>> modprobe xen-blkback;
>> echo bound;
>> cd $(pwd);
>> sleep 3;
>> done
>>
>> in dom0 whilst running the same loop as above in the (single) PV guest.
>>
>> Some (less stressful) testing has also been done using a Windows HVM guest
>> with the latest 9.0 PV drivers installed.
>>
>> Signed-off-by: Paul Durrant <pdurrant@amazon.com>
>
> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
>
> Thanks!
>
> Juergen: I guess you will also pick this series and merge it from the
> Xen tree instead of the block one?
Yes.
Juergen
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next prev parent reply other threads:[~2019-12-12 12:04 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-11 15:29 [PATCH v3 0/4] xen-blkback: support live update Paul Durrant
2019-12-11 15:29 ` [Xen-devel] " Paul Durrant
2019-12-11 15:29 ` [PATCH v3 1/4] xenbus: move xenbus_dev_shutdown() into frontend code Paul Durrant
2019-12-11 15:29 ` [Xen-devel] " Paul Durrant
2019-12-11 15:29 ` [PATCH v3 2/4] xenbus: limit when state is forced to closed Paul Durrant
2019-12-11 15:29 ` [Xen-devel] " Paul Durrant
2019-12-12 6:02 ` Jürgen Groß
2019-12-12 6:02 ` [Xen-devel] " Jürgen Groß
2019-12-11 15:29 ` [PATCH v3 3/4] xen/interface: re-define FRONT/BACK_RING_ATTACH() Paul Durrant
2019-12-11 15:29 ` [Xen-devel] " Paul Durrant
2019-12-12 6:04 ` Jürgen Groß
2019-12-12 6:04 ` [Xen-devel] " Jürgen Groß
2019-12-13 8:59 ` Jürgen Groß
2019-12-13 8:59 ` [Xen-devel] " Jürgen Groß
2019-12-13 9:02 ` Durrant, Paul
2019-12-13 9:02 ` [Xen-devel] " Durrant, Paul
2019-12-11 15:29 ` [PATCH v3 4/4] xen-blkback: support dynamic unbind/bind Paul Durrant
2019-12-11 15:29 ` [Xen-devel] " Paul Durrant
2019-12-12 6:07 ` Jürgen Groß
2019-12-12 6:07 ` [Xen-devel] " Jürgen Groß
2019-12-12 11:46 ` Roger Pau Monné
2019-12-12 11:46 ` [Xen-devel] " Roger Pau Monné
2019-12-12 12:04 ` Jürgen Groß [this message]
2019-12-12 12:04 ` Jürgen Groß
2019-12-20 12:45 ` [PATCH v3 0/4] xen-blkback: support live update Jürgen Groß
2019-12-20 12:45 ` [Xen-devel] " Jürgen Groß
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