linux-kernel - Re: [PATCH v7 0/6] xen/arm/arm64: CONFIG_PARAVIRT and stolen ticks accounting

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Message-ID: <20130628155840.GA13468@phenom.dumpdata.com>
Date:	Fri, 28 Jun 2013 11:58:40 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"marc.zyngier@....com" <marc.zyngier@....com>,
	Will Deacon <will.deacon@....com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Olof Johansson <olof@...om.net>, arnd@...db.de,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH v7 0/6] xen/arm/arm64: CONFIG_PARAVIRT and stolen ticks
 accounting

On Fri, Jun 28, 2013 at 12:19:54PM +0100, Stefano Stabellini 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
> 
> 
> Stefano Stabellini (6):
>       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
>       core: remove ifdef CONFIG_PARAVIRT
>       xen/arm: account for stolen ticks
> 
>  arch/arm/Kconfig                  |   20 ++++++++
>  arch/arm/include/asm/paravirt.h   |   20 ++++++++
>  arch/arm/kernel/Makefile          |    1 +
>  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 +------------------------------

This is going to hit some of the patches that David
has sent to tglx, I think. You might want to try to rebase on top
of them (tip/time/for-xen, or something like that ) when they
are ready.

But for the Xen generic maintainer I am OK with these changes
so you can stick Acked-by on them.

Are you thinking to push them yourself or via the arm64 maintainer?

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