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[Xen-ia64-devel] [PATCH 2/5] kexec: improve __cpu_die()
| To: | xen-ia64-devel@xxxxxxxxxxxxxxxxxxx |
|---|---|
| Subject: | [Xen-ia64-devel] [PATCH 2/5] kexec: improve __cpu_die() |
| From: | Isaku Yamahata <yamahata@xxxxxxxxxxxxx> |
| Date: | Thu, 24 Jul 2008 14:59:59 +0900 |
| Cc: | Isaku Yamahata <yamahata@xxxxxxxxxxxxx> |
| Delivery-date: | Wed, 23 Jul 2008 22:58:50 -0700 |
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| User-agent: | Mutt/1.5.18 (2008-05-17) |
[IA64] improve __cpu_die()
use udelay instead of nop loop.
This patch reduces __cpu_die() time much.
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
diff -r b4adb5049860 xen/arch/ia64/linux-xen/smpboot.c
--- a/xen/arch/ia64/linux-xen/smpboot.c Thu Jul 24 14:24:39 2008 +0900
+++ b/xen/arch/ia64/linux-xen/smpboot.c Thu Jul 24 14:24:54 2008 +0900
@@ -748,9 +748,7 @@
return;
}
#ifdef XEN
- /* XXX: There must be a better way to sleep */
- for (int j = 0; j < 1000000; j++)
- cpu_relax();
+ udelay(100 * 1000);
#else
msleep(100);
#endif
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