[SPARC64]: Set appropriate max_cache_size.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 35 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 4e8cd79156e0..f03d52d0b88d 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -1287,6 +1287,40 @@ int setup_profiling_timer(unsigned int multiplier)
         return 0;
 }
 
+static void __init smp_tune_scheduling(void)
+{
+        int instance, node;
+        unsigned int def, smallest = ~0U;
+
+        def = ((tlb_type == hypervisor) ?
+               (3 * 1024 * 1024) :
+               (4 * 1024 * 1024));
+
+        instance = 0;
+        while (!cpu_find_by_instance(instance, &node, NULL)) {
+                unsigned int val;
+
+                val = prom_getintdefault(node, "ecache-size", def);
+                if (val < smallest)
+                        smallest = val;
+
+                instance++;
+        }
+
+        /* Any value less than 256K is nonsense.  */
+        if (smallest < (256U * 1024U))
+                smallest = 256 * 1024;
+
+        max_cache_size = smallest;
+
+        if (smallest < 1U * 1024U * 1024U)
+                printk(KERN_INFO "Using max_cache_size of %uKB\n",
+                       smallest / 1024U);
+        else
+                printk(KERN_INFO "Using max_cache_size of %uMB\n",
+                       smallest / 1024U / 1024U);
+}
+
 /* Constrain the number of cpus to max_cpus.  */
 void __init smp_prepare_cpus(unsigned int max_cpus)
 {
@@ -1322,6 +1356,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
         }
 
         smp_store_cpu_info(boot_cpu_id);
+        smp_tune_scheduling();
 }
 
 /* Set this up early so that things like the scheduler can init