[Xen-changelog] [xen-unstable] linux: Use old-mode of save/restore for uniproc guests (it's faster).

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1172851222 0
# Node ID 1fb5ae0ee4532bcbf4f1e5942efa4e3dcf098640
# Parent  1061c7bff38f3e6e66fee96c407977ad55b3f2f2
linux: Use old-mode of save/restore for uniproc guests (it's faster).
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
 linux-2.6-xen-sparse/drivers/xen/core/machine_reboot.c |    4 ++++
 1 files changed, 4 insertions(+)

diff -r 1061c7bff38f -r 1fb5ae0ee453 
linux-2.6-xen-sparse/drivers/xen/core/machine_reboot.c
--- a/linux-2.6-xen-sparse/drivers/xen/core/machine_reboot.c    Fri Mar 02 
15:59:12 2007 +0000
+++ b/linux-2.6-xen-sparse/drivers/xen/core/machine_reboot.c    Fri Mar 02 
16:00:22 2007 +0000
@@ -210,6 +210,10 @@ int __xen_suspend(int fast_suspend)
        }
 #endif
 
+       /* If we are definitely UP then 'slow mode' is actually faster. */
+       if (num_possible_cpus() == 1)
+               fast_suspend = 0;
+
        if (fast_suspend) {
                xenbus_suspend();
                err = stop_machine_run(take_machine_down, &fast_suspend, 0);

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