---

yaml
---
r: 58261
b: refs/heads/master
c: 0437e10
h: refs/heads/master
i:
  58259: 9f60fa8
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0e6aca43e08a62a48d6770e9a159dbec167bf4c6
+refs/heads/master: 0437e109e1841607f2988891eaa36c531c6aa6ac

trunk/Documentation/kernel-parameters.txt

@@ -1014,49 +1014,6 @@ and is between 256 and 4096 characters. It is defined in the file
 
 	mga=		[HW,DRM]
 
-	migration_cost=
-			[KNL,SMP] debug: override scheduler migration costs
-			Format: <level-1-usecs>,<level-2-usecs>,...
-			This debugging option can be used to override the
-			default scheduler migration cost matrix. The numbers
-			are indexed by 'CPU domain distance'.
-			E.g. migration_cost=1000,2000,3000 on an SMT NUMA
-			box will set up an intra-core migration cost of
-			1 msec, an inter-core migration cost of 2 msecs,
-			and an inter-node migration cost of 3 msecs.
-
-			WARNING: using the wrong values here can break
-			scheduler performance, so it's only for scheduler
-			development purposes, not production environments.
-
-	migration_debug=
-			[KNL,SMP] migration cost auto-detect verbosity
-			Format=<0|1|2>
-			If a system's migration matrix reported at bootup
-			seems erroneous then this option can be used to
-			increase verbosity of the detection process.
-			We default to 0 (no extra messages), 1 will print
-			some more information, and 2 will be really
-			verbose (probably only useful if you also have a
-			serial console attached to the system).
-
-	migration_factor=
-			[KNL,SMP] multiply/divide migration costs by a factor
-			Format=<percent>
-			This debug option can be used to proportionally
-			increase or decrease the auto-detected migration
-			costs for all entries of the migration matrix.
-			E.g. migration_factor=150 will increase migration
-			costs by 50%. (and thus the scheduler will be less
-			eager migrating cache-hot tasks)
-			migration_factor=80 will decrease migration costs
-			by 20%. (thus the scheduler will be more eager to
-			migrate tasks)
-
-			WARNING: using the wrong values here can break
-			scheduler performance, so it's only for scheduler
-			development purposes, not production environments.
-
 	mousedev.tap_time=
 			[MOUSE] Maximum time between finger touching and
 			leaving touchpad surface for touch to be considered

trunk/arch/i386/kernel/smpboot.c

@@ -941,17 +941,6 @@ static int __cpuinit __smp_prepare_cpu(int cpu)
 }
 #endif
 
-static void smp_tune_scheduling(void)
-{
-	if (cpu_khz) {
-		/* cache size in kB */
-		long cachesize = boot_cpu_data.x86_cache_size;
-
-		if (cachesize > 0)
-			max_cache_size = cachesize * 1024;
-	}
-}
-
 /*
  * Cycle through the processors sending APIC IPIs to boot each.
  */
@@ -980,7 +969,6 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
 	x86_cpu_to_apicid[0] = boot_cpu_physical_apicid;
 
 	current_thread_info()->cpu = 0;
-	smp_tune_scheduling();
 
 	set_cpu_sibling_map(0);
 

trunk/arch/ia64/kernel/setup.c

@@ -805,7 +805,6 @@ static void __cpuinit
 get_max_cacheline_size (void)
 {
 	unsigned long line_size, max = 1;
-	unsigned int cache_size = 0;
 	u64 l, levels, unique_caches;
         pal_cache_config_info_t cci;
         s64 status;
@@ -835,8 +834,6 @@ get_max_cacheline_size (void)
 		line_size = 1 << cci.pcci_line_size;
 		if (line_size > max)
 			max = line_size;
-		if (cache_size < cci.pcci_cache_size)
-			cache_size = cci.pcci_cache_size;
 		if (!cci.pcci_unified) {
 			status = ia64_pal_cache_config_info(l,
 						    /* cache_type (instruction)= */ 1,
@@ -853,9 +850,6 @@ get_max_cacheline_size (void)
 			ia64_i_cache_stride_shift = cci.pcci_stride;
 	}
   out:
-#ifdef CONFIG_SMP
-	max_cache_size = max(max_cache_size, cache_size);
-#endif
 	if (max > ia64_max_cacheline_size)
 		ia64_max_cacheline_size = max;
 }

trunk/arch/mips/kernel/smp.c

@@ -51,16 +51,6 @@ 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 = cd->linesz * cd->sets * cd->ways;
-
-	if (cachesize > max_cache_size)
-		max_cache_size = cachesize;
-}
-
 extern void __init calibrate_delay(void);
 extern ATTRIB_NORET void cpu_idle(void);
 
@@ -228,7 +218,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 {
 	init_new_context(current, &init_mm);
 	current_thread_info()->cpu = 0;
-	smp_tune_scheduling();
 	plat_prepare_cpus(max_cpus);
 #ifndef CONFIG_HOTPLUG_CPU
 	cpu_present_map = cpu_possible_map;

trunk/arch/sparc/kernel/smp.c

@@ -68,16 +68,6 @@ void __cpuinit smp_store_cpu_info(int id)
 	cpu_data(id).prom_node = cpu_node;
 	cpu_data(id).mid = cpu_get_hwmid(cpu_node);
 
-	/* this is required to tune the scheduler correctly */
-	/* is it possible to have CPUs with different cache sizes? */
-	if (id == boot_cpu_id) {
-		int cache_line,cache_nlines;
-		cache_line = 0x20;
-		cache_line = prom_getintdefault(cpu_node, "ecache-line-size", cache_line);
-		cache_nlines = 0x8000;
-		cache_nlines = prom_getintdefault(cpu_node, "ecache-nlines", cache_nlines);
-		max_cache_size = cache_line * cache_nlines;
-	}
 	if (cpu_data(id).mid < 0)
 		panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
 }

trunk/arch/sparc64/kernel/smp.c

@@ -1163,32 +1163,6 @@ int setup_profiling_timer(unsigned int multiplier)
 	return -EINVAL;
 }
 
-static void __init smp_tune_scheduling(void)
-{
-	unsigned int smallest = ~0U;
-	int i;
-
-	for (i = 0; i < NR_CPUS; i++) {
-		unsigned int val = cpu_data(i).ecache_size;
-
-		if (val && val < smallest)
-			smallest = val;
-	}
-
-	/* 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)
 {
@@ -1206,7 +1180,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 	}
 
 	cpu_data(boot_cpu_id).udelay_val = loops_per_jiffy;
-	smp_tune_scheduling();
 }
 
 void __devinit smp_prepare_boot_cpu(void)

trunk/include/linux/sched.h

@@ -754,12 +754,6 @@ struct sched_domain {
 extern int partition_sched_domains(cpumask_t *partition1,
 				    cpumask_t *partition2);
 
-/*
- * Maximum cache size the migration-costs auto-tuning code will
- * search from:
- */
-extern unsigned int max_cache_size;
-
 #endif	/* CONFIG_SMP */