diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc64/kernel/smp.c | 35 |
1 files changed, 35 insertions, 0 deletions
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 |