linux-kernel - Re: [PATCH v3 3/3] xen: optimize xenbus driver for multiple concurrent xenstore accesses

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Message-ID: <49ffaec9-eb1d-1c30-7547-5195320dfd63@oracle.com>
Date:   Tue, 24 Jan 2017 12:17:58 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v3 3/3] xen: optimize xenbus driver for multiple
 concurrent xenstore accesses

On 01/24/2017 11:23 AM, Juergen Gross wrote:
> On 24/01/17 14:47, Boris Ostrovsky wrote:
>> On 01/23/2017 01:59 PM, Boris Ostrovsky wrote:
>>> On 01/23/2017 05:09 AM, Juergen Gross wrote:
>>>> Handling of multiple concurrent Xenstore accesses through xenbus driver
>>>> either from the kernel or user land is rather lame today: xenbus is
>>>> capable to have one access active only at one point of time.
>>>>
>>>>
>>
>> This patch appears to break save/restore:
> Hmm, tried multiple times, but I can't reproduce this issue.
>
> Anything special in the setup? I tried a 64 bit pv guest and did
> "xl save".
>
> Do I have to run some load in parallel?
>

No, the guest is idle when it is being suspended, and it's the only
guest. This was a PV 64-bit guest but I think most of them failed.

I am building
git://git.kernel.org/pub/scm/linux/kernel/git/ostr/linux.git
for-linus-4.11, with the attached config.

-boris

View attachment "x64_config" of type "text/plain" (106739 bytes)