On Thu, 12 Jul 2001, Edgar Denny wrote:
> Thankyou very much.
Here you go...it's against 2.4.5, but it should easily apply to any 2.4
kernel...
Index: arch/alpha/kernel/smp.c
===================================================================
RCS file: /home/CVSROOT/linux-24/arch/alpha/kernel/smp.c,v
retrieving revision 1.1.1.3
diff -u -b -r1.1.1.3 smp.c
--- arch/alpha/kernel/smp.c 1 Jun 2001 17:40:18 -0000 1.1.1.3
+++ arch/alpha/kernel/smp.c 28 Jun 2001 14:47:53 -0000
@@ -72,7 +72,6 @@
int smp_num_probed; /* Internal processor count */
int smp_num_cpus = 1; /* Number that came online. */
int smp_threads_ready; /* True once the per process idle is forked. */
-cycles_t cacheflush_time;
int __cpu_number_map[NR_CPUS];
int __cpu_logical_map[NR_CPUS];
@@ -205,62 +204,6 @@
/*
- * 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.
- *
- * We are not told how much cache there is, so we have to guess.
- */
-static void __init
-smp_tune_scheduling (void)
-{
- struct percpu_struct *cpu;
- unsigned long on_chip_cache;
- unsigned long freq;
-
- cpu = (struct percpu_struct*)((char*)hwrpb + hwrpb->processor_offset);
- switch (cpu->type)
- {
- case EV45_CPU:
- on_chip_cache = 16 + 16;
- break;
-
- case EV5_CPU:
- case EV56_CPU:
- on_chip_cache = 8 + 8 + 96;
- break;
-
- case PCA56_CPU:
- on_chip_cache = 16 + 8;
- break;
-
- case EV6_CPU:
- case EV67_CPU:
- on_chip_cache = 64 + 64;
- break;
-
- default:
- on_chip_cache = 8 + 8;
- break;
- }
-
- freq = hwrpb->cycle_freq ? : est_cycle_freq;
-
-#if 0
- /* Magic estimation stolen from x86 port. */
- cacheflush_time = freq / 1024L * on_chip_cache / 5000L;
-
- printk("Using heuristic of %d cycles.\n",
- cacheflush_time);
-#else
- /* Magic value to force potential preemption of other CPUs. */
- cacheflush_time = INT_MAX;
-
- printk("Using heuristic of %d cycles.\n",
- cacheflush_time);
-#endif
-}
-
-/*
* Send a message to a secondary's console. "START" is one such
* interesting message. ;-)
*/
@@ -599,7 +542,6 @@
current->processor = boot_cpuid;
smp_store_cpu_info(boot_cpuid);
- smp_tune_scheduling();
smp_setup_percpu_timer(boot_cpuid);
init_idle();
