Move xen patchset to new version's subdir.

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.arch / s390-09-04-topology.diff

diff --git a/src/patches/suse-2.6.27.31/patches.arch/s390-09-04-topology.diff b/src/patches/suse-2.6.27.31/patches.arch/s390-09-04-topology.diff
new file mode 100644 (file)
index 0000000..db7bc99
--- /dev/null
+++ b/src/patches/suse-2.6.27.31/patches.arch/s390-09-04-topology.diff
@@ -0,0 +1,30 @@
+From: Gerald Schaefer <geraldsc@de.ibm.com>
+Subject: topology: introduce arch specific SD_MC_INIT initializer
+References: bnc#477666,LTC#51049
+
+Symptom:     Up to 30% more cpu usage for some workloads.
+Problem:     For some workloads the extra multicore scheduling domain causes
+             additional cpu usage because of too optimistic assumptions when
+             it is ok to migrate processes from one cpu to another. The default
+             values for SD_MC_INIT don't work well on s390.
+Solution:    Define an architecure specific SD_MC_INIT scheduling domain
+             initializer which fixes the regression.
+
+Acked-by: John Jolly <jjolly@suse.de>
+---
+ arch/s390/include/asm/topology.h |    2 ++
+ 1 file changed, 2 insertions(+)
+
+Index: linux-sles11/arch/s390/include/asm/topology.h
+===================================================================
+--- linux-sles11.orig/arch/s390/include/asm/topology.h
++++ linux-sles11/arch/s390/include/asm/topology.h
+@@ -28,6 +28,8 @@ static inline void s390_init_cpu_topolog
+ };
+ #endif
+ 
++#define SD_MC_INIT SD_CPU_INIT
++
+ #include <asm-generic/topology.h>
+ 
+ #endif /* _ASM_S390_TOPOLOGY_H */