From mboxrd@z Thu Jan  1 00:00:00 1970
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Subject: Re: [PATCH MINI-OS v3 1/2] xenbus: notify the other end
 when necessary
Date: Tue, 27 Oct 2015 16:46:43 +0100
Message-ID: <20151027154643.GE2483@var.bordeaux.inria.fr>
References: <1445960609-16977-1-git-send-email-wei.liu2@citrix.com>
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To: Wei Liu <wei.liu2@citrix.com>
Cc: minios-devel@lists.xenproject.org, Xen-devel <xen-devel@lists.xenproject.org>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Ian Campbell <ian.campbell@citrix.com>
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Wei Liu, le Tue 27 Oct 2015 15:43:28 +0000, a =E9crit :
> The xenbus thread didn't send notification to other end when it expected
> more data or consumed responses, which led to stalling the ring from
> time to time.
> =

> This is the culprit that guest was less responsive when using stubdom
> because the device model was stalled.
> =

> Fix this by sending notification to the other end when it consumes a
> message. A bunch of memory barriers are also added to ensure
> correctness.
> =

> Signed-off-by: Wei Liu <wei.liu2@citrix.com>

Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

And it should clearly be backported to stable branches.

Samuel