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Re: [Xen-devel] [PATCH v3] xen: Fix x86 sched_clock() interface for xen
- To: Juergen Gross <jgross@xxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, x86@xxxxxxxxxx
- From: Hans van Kranenburg <hans@xxxxxxxxxxx>
- Date: Wed, 16 Jan 2019 01:24:09 +0100
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- Cc: sstabellini@xxxxxxxxxx, stable@xxxxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, hpa@xxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, tglx@xxxxxxxxxxxxx
- Delivery-date: Wed, 16 Jan 2019 00:25:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
Hi,
On 1/14/19 1:44 PM, 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.
>
> [...]
With v3 of the patch, I see the time jump in one log line happen, but
only when using PVH.
[ 49.486453] Freezing user space processes ... (elapsed 0.002 seconds)
done.
[ 49.488743] OOM killer disabled.
[ 49.488764] Freezing remaining freezable tasks ... (elapsed 0.001
seconds) done.
[ 49.491117] suspending xenstore...
[2000731.388722] xen:events: Xen HVM callback vector for event delivery
is enabled
[ 49.491750] xen:grant_table: Grant tables using version 1 layout
[ 49.810722] OOM killer enabled.
[ 49.810744] Restarting tasks ... done.
[ 49.856263] Setting capacity to 6291456
[ 50.006002] Setting capacity to 10485760
If I start as PV, it never seems to happen.
Up to you to decide how important this is. :)
FYI this is with v3 on top of the Debian stretch-backports 4.19 kernel,
which I'm starting to use now to reboot things with.
-# uname -a
Linux appnode-kylie 4.19.0-0.bpo.1-cloud-amd64 #1 SMP Debian
4.19.12-1~bpo9+1+mendix1 (2019-01-15) x86_64 GNU/Linux
https://salsa.debian.org/knorrie-guest/linux/commits/mendix/stretch-backports
Hans
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