Gerd Hoffmann writes ("[Xen-devel] Re: [Qemu-devel] [PATCH] qemu and qemu-xen:
support empty write barriers in xen_disk"):
> On 11/24/10 14:08, Stefano Stabellini wrote:
> > this patch can be applied to both qemu-xen and qemu and adds support
> > for empty write barrier
On Fri, 26 Nov 2010, Kevin Wolf wrote:
> Am 24.11.2010 19:44, schrieb Christoph Hellwig:
> > On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
> >> Linux wants is a useful thing to do and implement (especially since it
> >> amounts to standardising the ?BSD extension). I'm not s
On Fri, Nov 26, 2010 at 12:03:35PM +0100, Kevin Wolf wrote:
> I don't think the synchronous flushes even do what they're supposed to
> do. Shouldn't ioreq->postsync do the flush after the request has
> completed instead of doing it as soon as it has been submitted?
Indeed, that's yet another bug i
Am 24.11.2010 19:44, schrieb Christoph Hellwig:
> On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
>> Linux wants is a useful thing to do and implement (especially since it
>> amounts to standardising the ?BSD extension). I'm not sure of their
>> precise semantics (esp WRT orde
On Thu, Nov 25, 2010 at 11:46:40AM -0800, Jeremy Fitzhardinge wrote:
> The latter. There's a question over whether WRITE_BARRIER really
> supports empty barriers, since it appears that none of the existing
> backends implement it correctly - but on the other hand, the kernel
> blkback code does *t
On 11/25/2010 11:30 AM, Ian Jackson wrote:
> Christoph Hellwig writes ("Re: [Xen-devel] Re: [Qemu-devel] [PATCH] qemu and
> qemu-xen: support empty write barriers in xen_disk"):
>> On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
>>> Linux wa
Christoph Hellwig writes ("Re: [Xen-devel] Re: [Qemu-devel] [PATCH] qemu and
qemu-xen: support empty write barriers in xen_disk"):
> On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
> > Linux wants is a useful thing to do and implement (especially sinc
On Wed, 24 Nov 2010, Christoph Hellwig wrote:
> On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
> > Linux wants is a useful thing to do and implement (especially since it
> > amounts to standardising the ?BSD extension). I'm not sure of their
> > precise semantics (esp WRT ord
On Wed, Nov 24, 2010 at 10:18:40AM -0800, Jeremy Fitzhardinge wrote:
> Linux wants is a useful thing to do and implement (especially since it
> amounts to standardising the ?BSD extension). I'm not sure of their
> precise semantics (esp WRT ordering), but I think its already OK.
The nice bit is t
I had the discussion with Jeremy in Boston before, but let's repeat it
here:
- is there actually any pre-existing xen backend that does properly
implement empty barries. Back then we couldn't find any.
- if this is a new concept to Xen please do not define an empty
barrier primitive, but
On 11/24/2010 08:58 AM, Christoph Hellwig wrote:
> I had the discussion with Jeremy in Boston before, but let's repeat it
> here:
>
> - is there actually any pre-existing xen backend that does properly
>implement empty barries. Back then we couldn't find any.
> - if this is a new concept to
On Wed, 24 Nov 2010, Kevin Wolf wrote:
> > On 11/24/10 14:08, Stefano Stabellini wrote:
> >> this patch can be applied to both qemu-xen and qemu and adds support
> >> for empty write barriers to xen_disk.
> >
> > Looks good.
> >
> > Acked-by: Gerd Hoffmann
>
> Thanks, applied to the block branc
Am 24.11.2010 15:23, schrieb Gerd Hoffmann:
> On 11/24/10 14:08, Stefano Stabellini wrote:
>> this patch can be applied to both qemu-xen and qemu and adds support
>> for empty write barriers to xen_disk.
>
> Looks good.
>
> Acked-by: Gerd Hoffmann
Thanks, applied to the block branch.
Kevin
On 11/24/10 14:08, Stefano Stabellini wrote:
this patch can be applied to both qemu-xen and qemu and adds support
for empty write barriers to xen_disk.
Looks good.
Acked-by: Gerd Hoffmann
cheers,
Gerd
Hi all,
this patch can be applied to both qemu-xen and qemu and adds support
for empty write barriers to xen_disk.
Signed-off-by: Stefano Stabellini
diff --git a/hw/xen_disk.c b/hw/xen_disk.c
index 38b5fbf..94af001 100644
--- a/hw/xen_disk.c
+++ b/hw/xen_disk.c
@@ -182,6 +182,10 @@ static int io
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