From 688340ea34c61ad12473ccd837325b59aada9a93 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Tue, 17 Jul 2007 18:37:04 -0700 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. Signed-off-by: Jeremy Fitzhardinge Cc: Zachary Amsden Cc: Dan Hecht Cc: john stultz --- arch/i386/kernel/vmi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/i386/kernel/vmi.c') diff --git a/arch/i386/kernel/vmi.c b/arch/i386/kernel/vmi.c index 234bd6ff518..72042bb7ec9 100644 --- a/arch/i386/kernel/vmi.c +++ b/arch/i386/kernel/vmi.c @@ -891,7 +891,7 @@ static inline int __init activate_vmi(void) paravirt_ops.setup_boot_clock = vmi_time_bsp_init; paravirt_ops.setup_secondary_clock = vmi_time_ap_init; #endif - paravirt_ops.get_scheduled_cycles = vmi_get_sched_cycles; + paravirt_ops.sched_clock = vmi_sched_clock; paravirt_ops.get_cpu_khz = vmi_cpu_khz; /* We have true wallclock functions; disable CMOS clock sync */ -- cgit v1.2.3