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| author | Keir Fraser <keir.fraser@citrix.com> | 2008-07-29 10:42:30 +0100 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2008-07-29 10:42:30 +0100 |
| commit | 5c23498926626385ea51a774ea1a5d0e5c35ab77 (patch) | |
| tree | a6e1222bd6fa9366137abb4725c5ab9add713d6b | |
| parent | ef5cb4e6a0c2d204ae7ff3919d6515aa7889fb2a (diff) | |
| download | xen-5c23498926626385ea51a774ea1a5d0e5c35ab77.tar.gz xen-5c23498926626385ea51a774ea1a5d0e5c35ab77.tar.bz2 xen-5c23498926626385ea51a774ea1a5d0e5c35ab77.zip | |
x86: reprogram LAPIC timer in pit_broadcast_exit
Thus to remove possible timer expiring delay caused by deep C state
LAPIC timer stopping.
Signed-off-by: Wei Gang <gang.wei@intel.com>
| -rw-r--r-- | xen/arch/x86/time.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c index 570a630884..1c73840b61 100644 --- a/xen/arch/x86/time.c +++ b/xen/arch/x86/time.c @@ -1135,7 +1135,10 @@ void pit_broadcast_enter(void) void pit_broadcast_exit(void) { - cpu_clear(smp_processor_id(), pit_broadcast_mask); + int cpu = smp_processor_id(); + + if ( cpu_test_and_clear(cpu, pit_broadcast_mask) ) + reprogram_timer(per_cpu(timer_deadline, cpu)); } int pit_broadcast_is_available(void) |