Revert "Move xen patchset to new version's subdir."

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.arch / s390-05-08-topology.patch

diff --git a/src/patches/suse-2.6.27.31/patches.arch/s390-05-08-topology.patch b/src/patches/suse-2.6.27.31/patches.arch/s390-05-08-topology.patch
deleted file mode 100644 (file)
index f876b32..0000000
--- a/src/patches/suse-2.6.27.31/patches.arch/s390-05-08-topology.patch
+++ /dev/null
@@ -1,74 +0,0 @@
-From: Gerald Schaefer <geraldsc@de.ibm.com>
-Subject: kernel: disable cpu topology support by default
-References: bnc#450096,LTC#50392
-
-Symptom:     System performance may be lower than expected.
-Problem:     If the hardware supports the configuration-topology facility
-             the system cpu topology information will be passed to the
-             scheduler. The scheduler bases its load balancing decisions
-             also on the cpu topology. This may have a negative performance
-             impact on machines where I/O interrupts are distributed unevenly
-             to cpus. Those cpus which are grouped together and get more I/O
-             interrupts than others will tend to have a higher average load.
-Solution:    Disable cpu topology support by default and add a kernel parameter
-             which allows to switch it on. In order to switch support on
-             topology=on needs to be added to the kernel parameter line.
-
-Acked-by: John Jolly <jjolly@suse.de>
----
- Documentation/kernel-parameters.txt |    8 ++++++++
- arch/s390/kernel/topology.c         |   12 +++++++++++-
- 2 files changed, 19 insertions(+), 1 deletion(-)
-
---- a/arch/s390/kernel/topology.c
-+++ b/arch/s390/kernel/topology.c
-@@ -59,6 +59,7 @@ struct core_info {
-       cpumask_t mask;
- };
- 
-+static int topology_enabled;
- static void topology_work_fn(struct work_struct *work);
- static struct tl_info *tl_info;
- static struct core_info core_info;
-@@ -79,7 +80,7 @@ cpumask_t cpu_coregroup_map(unsigned int
-       cpumask_t mask;
- 
-       cpus_clear(mask);
--      if (!machine_has_topology)
-+      if (!topology_enabled || !machine_has_topology)
-               return cpu_present_map;
-       spin_lock_irqsave(&topology_lock, flags);
-       while (core) {
-@@ -264,6 +265,15 @@ static void topology_interrupt(__u16 cod
-       schedule_work(&topology_work);
- }
- 
-+static int __init early_parse_topology(char *p)
-+{
-+      if (strncmp(p, "on", 2))
-+              return 0;
-+      topology_enabled = 1;
-+      return 0;
-+}
-+early_param("topology", early_parse_topology);
-+
- static int __init init_topology_update(void)
- {
-       int rc;
---- a/Documentation/kernel-parameters.txt
-+++ b/Documentation/kernel-parameters.txt
-@@ -2194,6 +2194,14 @@ and is between 256 and 4096 characters. 
-                       See comment before function dc390_setup() in
-                       drivers/scsi/tmscsim.c.
- 
-+      topology=       [S390]
-+                      Format: {off | on}
-+                      Specify if the kernel should make use of the cpu
-+                      topology informations if the hardware supports these.
-+                      The scheduler will make use of these informations and
-+                      e.g. base its process migration decisions on it.
-+                      Default is off.
-+
-       tp720=          [HW,PS2]
- 
-       trix=           [HW,OSS] MediaTrix AudioTrix Pro