From: David S. Miller <davem@sunset.davemloft.net>
Date: Sun, 11 Jun 2006 05:02:17 +0000 (-0700)
Subject: [SPARC64]: Set appropriate max_cache_size.
X-Git-Tag: v2.6.17~28
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=9145bcf63575a8b78590a5beaf604001e9c8d2ef;p=~shefty%2Frdma-dev.git

[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 4e8cd79156e..f03d52d0b88 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