[SPARC64]: Set appropriate max_cache_size.

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

diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 4e8cd79156e0e0adc4a737265290f1e7cf496871..f03d52d0b88dd73803cee49b98d9b0aeb90e5d92 100644 (file)
--- 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