Re: [Xen-devel] [PATCH v9 0/5] xen/arm/arm64: CONFIG_PARAVIRT and stolen ticks accounting

[Zoltan HERPAI <wigyori@xxxxxxx>]

Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> wrote:

>Hi all,
>this patch series introduces stolen ticks accounting for Xen on ARM and
>ARM64.
>Stolen ticks are clocksource ticks that have been "stolen" from the cpu,
>typically because Linux is running in a virtual machine and the vcpu has
>been descheduled.
>To account for these ticks we introduce CONFIG_PARAVIRT and pv_time_ops
>so that we can make use of:
>
>kernel/sched/cputime.c:steal_account_process_tick
>
>
>Changes in v9:
>- added back missing new files from patches;
>- fix compilation on avr32 (remove patch #5, revert to previous version
>  of patch #2).
>
>
>
>Stefano Stabellini (5):
>      xen: move xen_setup_runstate_info and get_runstate_snapshot to 
> drivers/xen/time.c
>      kernel: missing include in cputime.c
>      arm: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops
>      arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and 
> pv_time_ops
>      xen/arm: account for stolen ticks
>
> arch/arm/Kconfig                  |   20 ++++++++
> arch/arm/include/asm/paravirt.h   |   20 ++++++++
> arch/arm/kernel/Makefile          |    2 +
> arch/arm/kernel/paravirt.c        |   25 ++++++++++
> arch/arm/xen/enlighten.c          |   21 +++++++++
> arch/arm64/Kconfig                |   20 ++++++++
> arch/arm64/include/asm/paravirt.h |   20 ++++++++
> arch/arm64/kernel/Makefile        |    1 +
> arch/arm64/kernel/paravirt.c      |   25 ++++++++++
> arch/ia64/xen/time.c              |   48 +++----------------
> arch/x86/xen/time.c               |   76 +------------------------------
> drivers/xen/Makefile              |    2 +-
> drivers/xen/time.c                |   91 +++++++++++++++++++++++++++++++++++++
> include/xen/xen-ops.h             |    5 ++
> kernel/sched/cputime.c            |    3 ++
> 15 files changed, 261 insertions(+), 118 deletions(-)
> create mode 100644 arch/arm/include/asm/paravirt.h
> create mode 100644 arch/arm/kernel/paravirt.c
> create mode 100644 arch/arm64/include/asm/paravirt.h
> create mode 100644 arch/arm64/kernel/paravirt.c
> create mode 100644 drivers/xen/time.c
>
>
>git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen.git lost_ticks_9
>
>
>Cheers,
>
>Stefano
>
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