linux-kernel - Re: [PATCH v3] xen: Fix x86 sched

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Message-ID: <679672d3-c106-82bc-cfb4-08e61dcbad5f@knorrie.org>
Date:   Wed, 16 Jan 2019 01:26:39 +0100
From:   Hans van Kranenburg <hans@...rrie.org>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, x86@...nel.org
Cc:     sstabellini@...nel.org, hpa@...or.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, stable@...r.kernel.org
Subject: Re: [PATCH v3] xen: Fix x86 sched_clock() interface for xen

Hi Boris,

On 1/14/19 2:54 PM, Boris Ostrovsky wrote:
> On 1/14/19 7:44 AM, Juergen Gross wrote:
>> Commit f94c8d11699759 ("sched/clock, x86/tsc: Rework the x86 'unstable'
>> sched_clock() interface") broke Xen guest time handling across
>> migration:
>>
>> [  187.249951] Freezing user space processes ... (elapsed 0.001 seconds) done.
>> [  187.251137] OOM killer disabled.
>> [  187.251137] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
>> [  187.252299] suspending xenstore...
>> [  187.266987] xen:grant_table: Grant tables using version 1 layout
>> [18446743811.706476] OOM killer enabled.
>> [18446743811.706478] Restarting tasks ... done.
>> [18446743811.720505] Setting capacity to 16777216
>>
>> Fix that by setting xen_sched_clock_offset at resume time to ensure a
>> monotonic clock value.
>>
>> Fixes: f94c8d11699759 ("sched/clock, x86/tsc: Rework the x86 'unstable' sched_clock() interface")
>> Cc: <stable@...r.kernel.org> # 4.11
>> Reported-by: Hans van Kranenburg <hans@...rrie.org>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
> 
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

Can you please change the address to my work email?

Reported-by: Hans van Kranenburg <hans.van.kranenburg@...dix.com>

Also (see other email):

Tested-by: Hans van Kranenburg <hans.van.kranenburg@...dix.com>

Thanks,
Hans