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Re: [Xen-devel] [PATCH V3 0/3] xen-blkfront/xen-blkback trim support

On Mon, Aug 29, 2011 at 11:31 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> On Mon, Aug 29, 2011 at 03:50:28PM +0800, Li Dongyang wrote:
>> On Sat, Aug 27, 2011 at 12:56 AM, Konrad Rzeszutek Wilk
>> <konrad.wilk@xxxxxxxxxx> wrote:
>> > On Wed, Aug 24, 2011 at 05:23:42PM +0800, Li Dongyang wrote:
>> >> Dear list,
>> >> this is the V3 of the trim support for xen-blkfront/blkback,
>> >> thanks for all your reviews.
>> >> and when I looked back at Owen's patch in Dec 2010,
>> >> http://lists.xensource.com/archives/html/xen-devel/2010-12/msg00299.html
>> >> this patch above also add the trim union to blkif_x86_{32|64}_request,
>> >> and take care of trim request in blkif_get_x86{32|64}_req(),
>> >> however, in the later versions, the part is just gone. I wonder if it is
>> >> needed here? Thanks.
>> >
>> > Are you referring to git commit 51de69523ffe1c17994dc2f260369f29dfdce71c
>> > xen: Union the blkif_request request specific fields
>> that's the patch merged, the link I gave above was the previous
>> version cooked up by
>> Owen, and the patch in the link has changes to struct
>> blkif_x86_{32|64}_request related stuffs,
>> but that;s gone in the merged version, so I'm not sure if the gone
>> part is needed here, Thanks
> Well, I presume that you tested this patchset you are posting. If it
> works properly (and you do see the discard operations in dom0) then
> you do not need the extra parts.
sorry forgot to mention that the patch has been tested on a x86-64 host,
with both 32bit and 64bit guests, and it won't work for 32bit guests
without this part.
gonna post a V4.
> You are testing this patchset on SSDs, right?
I only tested on file backend cause I don't have handy SSD right now, and
the disk space of the image did reduce if we discard in the guest, Thanks

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