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authorIsaku Yamahata <yamahata@valinux.co.jp>2009-03-04 13:05:41 +0100
committerTony Luck <tony.luck@intel.com>2009-03-26 18:50:51 +0100
commit1aec1c558a797512e922581b21a178a05438bfc9 (patch)
treead5fb128e3dc4a6575bdf61534c2bf314ea1d094 /arch/ia64/xen/time.c
parentia64/pv_ops/pv_time_ops: add sched_clock hook. (diff)
downloadlinux-1aec1c558a797512e922581b21a178a05438bfc9.tar.xz
linux-1aec1c558a797512e922581b21a178a05438bfc9.zip
ia64/pv_ops/xen/pv_time_ops: implement sched_clock.
paravirtualize sched_clock. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/xen/time.c')
-rw-r--r--arch/ia64/xen/time.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/ia64/xen/time.c b/arch/ia64/xen/time.c
index 68d6204c3f16..fb8332690179 100644
--- a/arch/ia64/xen/time.c
+++ b/arch/ia64/xen/time.c
@@ -175,10 +175,58 @@ static void xen_itc_jitter_data_reset(void)
} while (unlikely(ret != lcycle));
}
+/* based on xen_sched_clock() in arch/x86/xen/time.c. */
+/*
+ * This relies on HAVE_UNSTABLE_SCHED_CLOCK. If it can't be defined,
+ * something similar logic should be implemented here.
+ */
+/*
+ * Xen sched_clock implementation. Returns the number of unstolen
+ * nanoseconds, which is nanoseconds the VCPU spent in RUNNING+BLOCKED
+ * states.
+ */
+static unsigned long long xen_sched_clock(void)
+{
+ struct vcpu_runstate_info runstate;
+
+ unsigned long long now;
+ unsigned long long offset;
+ unsigned long long ret;
+
+ /*
+ * Ideally sched_clock should be called on a per-cpu basis
+ * anyway, so preempt should already be disabled, but that's
+ * not current practice at the moment.
+ */
+ preempt_disable();
+
+ /*
+ * both ia64_native_sched_clock() and xen's runstate are
+ * based on mAR.ITC. So difference of them makes sense.
+ */
+ now = ia64_native_sched_clock();
+
+ get_runstate_snapshot(&runstate);
+
+ WARN_ON(runstate.state != RUNSTATE_running);
+
+ offset = 0;
+ if (now > runstate.state_entry_time)
+ offset = now - runstate.state_entry_time;
+ ret = runstate.time[RUNSTATE_blocked] +
+ runstate.time[RUNSTATE_running] +
+ offset;
+
+ preempt_enable();
+
+ return ret;
+}
+
struct pv_time_ops xen_time_ops __initdata = {
.init_missing_ticks_accounting = xen_init_missing_ticks_accounting,
.do_steal_accounting = xen_do_steal_accounting,
.clocksource_resume = xen_itc_jitter_data_reset,
+ .sched_clock = xen_sched_clock,
};
/* Called after suspend, to resume time. */