[MIPS] SMP: Get smp_tune_scheduling to do something useful.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 4 insertions, 21 deletions

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 0555fc554f65..c46e479c992b 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -51,31 +51,14 @@ int __cpu_logical_map[NR_CPUS];		/* Map logical to physical */
 EXPORT_SYMBOL(phys_cpu_present_map);
 EXPORT_SYMBOL(cpu_online_map);
 
+/* This happens early in bootup, can't really do it better */
 static void smp_tune_scheduling (void)
 {
         struct cache_desc *cd = &current_cpu_data.scache;
-        unsigned long cachesize;       /* kB   */
-        unsigned long cpu_khz;
+        unsigned long cachesize = cd->linesz * cd->sets * cd->ways;
 
-        /*
-         * Crude estimate until we actually meassure ...
-         */
-        cpu_khz = loops_per_jiffy * 2 * HZ / 1000;
-
-        /*
-         * Rough estimation for SMP scheduling, this is the number of
-         * cycles it takes for a fully memory-limited process to flush
-         * the SMP-local cache.
-         *
-         * (For a P5 this pretty much means we will choose another idle
-         *  CPU almost always at wakeup time (this is due to the small
-         *  L1 cache), on PIIs it's around 50-100 usecs, depending on
-         *  the cache size)
-         */
-        if (!cpu_khz)
-                return;
-
-        cachesize = cd->linesz * cd->sets * cd->ways;
+        if (cachesize > max_cache_size)
+                max_cache_size = cachesize;
 }
 
 extern void __init calibrate_delay(void);