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

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

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 0555fc554f6544619e77b7d102ec486d56dbae67..c46e479c992b4dae0f620fb3c0399e5674089b39 100644 (file)
--- 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);