linux-kernel - Re: [PATCH/RFC] replace get_scheduled_cycles with sched_clock paravirt

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Date:	Fri, 16 Mar 2007 16:30:26 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Dan Hecht <dhecht@...are.com>, Zachary Amsden <zach@...are.com>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	john stultz <johnstul@...ibm.com>
Subject: Re: [PATCH/RFC] replace get_scheduled_cycles with sched_clock
 paravirt_op

On Wed, 14 Mar 2007 12:07:14 -0700 Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Subject: Add a sched_clock paravirt_op
> 
> The tsc-based get_scheduled_cycles interface is not a good match for
> Xen's runstate accounting, which reports everything in nanoseconds.
> 
> This patch replaces this interface with a sched_clock interface, which
> matches both Xen and VMI's requirements.
> 
> In order to do this, we:
>    1. replace get_scheduled_cycles with sched_clock
>    2. hoist cycles_2_ns into a common header
>    3. update vmi accordingly
> 
> One thing to note: because sched_clock is implemented as a weak function in
> kernel/sched.c, we must define a real function in order to override this weak
> binding.  This means the usual paravirt_ops technique of using an inline
> function won't work in this case.

include/asm/paravirt.h: In function 'paravirt_sched_clock':
include/asm/paravirt.h:281: warning: implicit declaration of function 'PVOP_CALL0'
include/asm/paravirt.h:281: error: expected expression before 'unsigned'
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