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authorIsaku Yamahata <yamahata@valinux.co.jp>2009-03-04 21:05:40 +0900
committerTony Luck <tony.luck@intel.com>2009-03-26 10:50:42 -0700
commitf927da178671a824cf6c530f0623544206387e57 (patch)
treefb9178ff79bfd9ee3b396ff20018eacbfb222d47 /arch/ia64/kernel/time.c
parent496203b15b7249599712525c2b6aafe231b4628d (diff)
downloadop-kernel-dev-f927da178671a824cf6c530f0623544206387e57.zip
op-kernel-dev-f927da178671a824cf6c530f0623544206387e57.tar.gz
ia64/pv_ops/pv_time_ops: add sched_clock hook.
add sched_clock() hook to paravirtualize sched_clock(). ia64 sched_clock() is based on ar.itc which isn't stable on virtualized environment because vcpu may move around on pcpus. So it needs paravirtualization. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/time.c')
-rw-r--r--arch/ia64/kernel/time.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index f0ebb34..c323c7b 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -50,6 +50,15 @@ EXPORT_SYMBOL(last_cli_ip);
#endif
#ifdef CONFIG_PARAVIRT
+/* We need to define a real function for sched_clock, to override the
+ weak default version */
+unsigned long long sched_clock(void)
+{
+ return paravirt_sched_clock();
+}
+#endif
+
+#ifdef CONFIG_PARAVIRT
static void
paravirt_clocksource_resume(void)
{
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