# HG changeset patch
# User Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
# Node ID 93507316d0a08aa566ceb1752f2b565ee1c384ad
# Parent d7c010b63893b231e44f66ad658fa544cfae821f
[XEN][POWERPC] Switch to using power_save over idle_loop for blocking
It is debatable which is better, but usinf power_save makes more sense
to me. By defining XENPPC_USE_IDLE in setup.c you can switch back and
forth to your hearts content.
Signed-off-by: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
---
arch/powerpc/platforms/xen/setup.c | 39 +++++++++++++++++++++++--------------
1 files changed, 25 insertions(+), 14 deletions(-)
diff -r d7c010b63893 -r 93507316d0a0 arch/powerpc/platforms/xen/setup.c
--- a/arch/powerpc/platforms/xen/setup.c Mon Aug 28 14:51:29 2006 -0400
+++ b/arch/powerpc/platforms/xen/setup.c Mon Aug 28 15:10:14 2006 -0400
@@ -1,5 +1,6 @@
#define DEBUG
+#undef XENPPC_USE_IDLE
#include <linux/module.h>
#include <linux/rwsem.h>
@@ -157,30 +158,37 @@ static u64 jiffies_to_ns(unsigned long j
return j * (1000000000UL / HZ);
}
+static void xen_power_save(void)
+{
+ /* SCHEDOP_yield could immediately return. Instead, we
+ * want to idle in the Xen idle domain, so use
+ * SCHEDOP_block with a one-shot timer. */
+ /* XXX do tickless stuff here. See
+ * linux-2.6-xen-sparse/arch/xen/i386/kernel/time.c */
+ u64 now_ns = tb_to_ns(get_tb());
+ u64 offset_ns = jiffies_to_ns(1);
+ int rc;
+
+ rc = HYPERVISOR_set_timer_op(now_ns + offset_ns);
+ BUG_ON(rc != 0);
+
+ HYPERVISOR_sched_op(SCHEDOP_block, NULL);
+}
+
+#ifdef XENPPC_USE_IDLE
static void xen_idle(void)
{
while (1) {
local_irq_disable();
if (!need_resched()) {
- /* SCHEDOP_yield could immediately return. Instead, we
- * want to idle in the Xen idle domain, so use
- * SCHEDOP_block with a one-shot timer. */
- /* XXX do tickless stuff here. See
- * linux-2.6-xen-sparse/arch/xen/i386/kernel/time.c */
- u64 now_ns = tb_to_ns(get_tb());
- u64 offset_ns = jiffies_to_ns(1);
- int rc;
-
- rc = HYPERVISOR_set_timer_op(now_ns + offset_ns);
- BUG_ON(rc != 0);
-
- HYPERVISOR_sched_op(SCHEDOP_block, NULL);
+ xen_power_save();
}
local_irq_enable();
schedule();
}
}
+#endif
#ifdef CONFIG_SMP
@@ -297,8 +305,11 @@ define_machine(xen) {
.get_rtc_time = 0,
.calibrate_decr = generic_calibrate_decr,
.progress = xen_progress,
+#ifdef XENPPC_USE_IDLE
.idle_loop = xen_idle,
- .power_save = xen_idle,
+#else
+ .power_save = xen_power_save,
+#endif
#ifdef CONFIG_KEXEC
.machine_kexec = xen_machine_kexec,
.machine_kexec_prepare = xen_machine_kexec_prepare,
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