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| author | Keir Fraser <keir@xensource.com> | 2007-10-26 10:55:50 +0100 |
|---|---|---|
| committer | Keir Fraser <keir@xensource.com> | 2007-10-26 10:55:50 +0100 |
| commit | 7ce59f734046248232a3827b5e4e6f16795f8331 (patch) | |
| tree | adb98d7c63488600af8b3390d0886a500239245e /xen/arch/x86/hvm/vpt.c | |
| parent | d73a484a61f03d5e14b62f4374436e4d8e759894 (diff) | |
| download | xen-7ce59f734046248232a3827b5e4e6f16795f8331.tar.gz xen-7ce59f734046248232a3827b5e4e6f16795f8331.tar.bz2 xen-7ce59f734046248232a3827b5e4e6f16795f8331.zip | |
LAPIC timer accounting fix
Offset emulated local APIC timer so it doesn't tick during guest's
timer related processing. Otherwise, guests using the local APIC for
process accounting can see long sequences of process ticks incorrectly
charged to interrupt processing.
Signed-off-by: Ben Guthro <bguthro@virtualron.com>
Signed-off-by: Gary Grebus <ggrebus@virtualiron.com>
Diffstat (limited to 'xen/arch/x86/hvm/vpt.c')
| -rw-r--r-- | xen/arch/x86/hvm/vpt.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/xen/arch/x86/hvm/vpt.c b/xen/arch/x86/hvm/vpt.c index 9ce8991594..ec0ac0b11c 100644 --- a/xen/arch/x86/hvm/vpt.c +++ b/xen/arch/x86/hvm/vpt.c @@ -307,6 +307,13 @@ void create_periodic_time( pt->period_cycles = (u64)period * cpu_khz / 1000000L; pt->one_shot = one_shot; pt->scheduled = NOW() + period; + /* + * Offset LAPIC ticks from other timer ticks. Otherwise guests which use + * LAPIC ticks for process accounting can see long sequences of process + * ticks incorrectly accounted to interrupt processing. + */ + if ( is_lvtt(v, irq) ) + pt->scheduled += period >> 1; pt->cb = cb; pt->priv = data; |