linux-kernel - Re: [Xen-devel] [PATCH v9 0/5] xen/arm/arm64: CONFIG

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Date:	Thu, 09 Jan 2014 20:13:58 +0100
From:	Zoltan HERPAI <wigyori@...0.hu>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Ian Campbell <Ian.Campbell@...rix.com>, arnd@...db.de,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	" marc.zyngier@....com" <marc.zyngier@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	" linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Olof Johansson <olof@...om.net>,
	"linux-arm-kernel@...ts.infradead.org " 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH v9 0/5] xen/arm/arm64: CONFIG_PARAVIRT and
 stolen ticks accounting



Stefano Stabellini <stefano.stabellini@...citrix.com> 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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>Xen-devel@...ts.xen.org
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