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| author |   Jeremy Fitzhardinge <jeremy@xensource.com> | 2007-07-17 18:37:04 -0700 |
|---|---|---|
| committer |   Jeremy Fitzhardinge <jeremy@goop.org> | 2007-07-18 08:47:42 -0700 |
| commit | 688340ea34c61ad12473ccd837325b59aada9a93 (patch) | |
| tree | 2862f4dca8d47fc4e6ecfaba2243d813344e3cd2 /arch/i386/kernel/paravirt.c | |
| parent | paravirt: helper to disable all IO space (diff) | |
| download | linux-dev-688340ea34c61ad12473ccd837325b59aada9a93.tar.xz linux-dev-688340ea34c61ad12473ccd837325b59aada9a93.zip | |
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 <jeremy@xensource.com>
Cc: Zachary Amsden <zach@vmware.com>
Cc: Dan Hecht <dhecht@vmware.com>
Cc: john stultz <johnstul@us.ibm.com>
Diffstat (limited to 'arch/i386/kernel/paravirt.c')
| -rw-r--r-- | arch/i386/kernel/paravirt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/i386/kernel/paravirt.c b/arch/i386/kernel/paravirt.c index 60e08b9b50a4..53f07a8275e3 100644 --- a/arch/i386/kernel/paravirt.c +++ b/arch/i386/kernel/paravirt.c @@ -302,7 +302,7 @@ struct paravirt_ops paravirt_ops = { .write_msr = native_write_msr_safe, .read_tsc = native_read_tsc, .read_pmc = native_read_pmc, - .get_scheduled_cycles = native_read_tsc, + .sched_clock = native_sched_clock, .get_cpu_khz = native_calculate_cpu_khz, .load_tr_desc = native_load_tr_desc, .set_ldt = native_set_ldt, |