arch/tile: disable SD_WAKE_AFFINE flag on CPU/NODE scheduling domain

This allows processes to spread more effectively to multiple cores
(particularly important on 64-core chips!).

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

diff --git a/arch/tile/include/asm/topology.h b/arch/tile/include/asm/topology.h
index 343172d..6fdd0c8 100644 (file)
--- a/arch/tile/include/asm/topology.h
+++ b/arch/tile/include/asm/topology.h
@@ -44,25 +44,64 @@ static inline const struct cpumask *cpumask_of_node(int node)
 /* For now, use numa node -1 for global allocation. */
 #define pcibus_to_node(bus)            ((void)(bus), -1)
 
+/*
+ * TILE architecture has many cores integrated in one processor, so we need
+ * setup bigger balance_interval for both CPU/NODE scheduling domains to
+ * reduce process scheduling costs.
+ */
+
+/* sched_domains SD_CPU_INIT for TILE architecture */
+#define SD_CPU_INIT (struct sched_domain) {                            \
+       .min_interval           = 4,                                    \
+       .max_interval           = 128,                                  \
+       .busy_factor            = 64,                                   \
+       .imbalance_pct          = 125,                                  \
+       .cache_nice_tries       = 1,                                    \
+       .busy_idx               = 2,                                    \
+       .idle_idx               = 1,                                    \
+       .newidle_idx            = 0,                                    \
+       .wake_idx               = 0,                                    \
+       .forkexec_idx           = 0,                                    \
+                                                                       \
+       .flags                  = 1*SD_LOAD_BALANCE                     \
+                               | 1*SD_BALANCE_NEWIDLE                  \
+                               | 1*SD_BALANCE_EXEC                     \
+                               | 1*SD_BALANCE_FORK                     \
+                               | 0*SD_BALANCE_WAKE                     \
+                               | 0*SD_WAKE_AFFINE                      \
+                               | 0*SD_PREFER_LOCAL                     \
+                               | 0*SD_SHARE_CPUPOWER                   \
+                               | 0*SD_SHARE_PKG_RESOURCES              \
+                               | 0*SD_SERIALIZE                        \
+                               ,                                       \
+       .last_balance           = jiffies,                              \
+       .balance_interval       = 32,                                   \
+}
+
 /* sched_domains SD_NODE_INIT for TILE architecture */
-#define SD_NODE_INIT (struct sched_domain) {           \
-       .min_interval           = 8,                    \
-       .max_interval           = 32,                   \
-       .busy_factor            = 32,                   \
-       .imbalance_pct          = 125,                  \
-       .cache_nice_tries       = 1,                    \
-       .busy_idx               = 3,                    \
-       .idle_idx               = 1,                    \
-       .newidle_idx            = 2,                    \
-       .wake_idx               = 1,                    \
-       .flags                  = SD_LOAD_BALANCE       \
-                               | SD_BALANCE_NEWIDLE    \
-                               | SD_BALANCE_EXEC       \
-                               | SD_BALANCE_FORK       \
-                               | SD_WAKE_AFFINE        \
-                               | SD_SERIALIZE,         \
-       .last_balance           = jiffies,              \
-       .balance_interval       = 1,                    \
+#define SD_NODE_INIT (struct sched_domain) {                           \
+       .min_interval           = 16,                                   \
+       .max_interval           = 512,                                  \
+       .busy_factor            = 32,                                   \
+       .imbalance_pct          = 125,                                  \
+       .cache_nice_tries       = 1,                                    \
+       .busy_idx               = 3,                                    \
+       .idle_idx               = 1,                                    \
+       .newidle_idx            = 2,                                    \
+       .wake_idx               = 1,                                    \
+       .flags                  = 1*SD_LOAD_BALANCE                     \
+                               | 1*SD_BALANCE_NEWIDLE                  \
+                               | 1*SD_BALANCE_EXEC                     \
+                               | 1*SD_BALANCE_FORK                     \
+                               | 0*SD_BALANCE_WAKE                     \
+                               | 0*SD_WAKE_AFFINE                      \
+                               | 0*SD_PREFER_LOCAL                     \
+                               | 0*SD_SHARE_CPUPOWER                   \
+                               | 0*SD_SHARE_PKG_RESOURCES              \
+                               | 1*SD_SERIALIZE                        \
+                               ,                                       \
+       .last_balance           = jiffies,                              \
+       .balance_interval       = 128,                                  \
 }
 
 /* By definition, we create nodes based on online memory. */