diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/mm/numa.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index 51d707d85b2d..177659050fa0 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -8,6 +8,8 @@ * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ +#define pr_fmt(fmt) "numa: " fmt + #include <linux/threads.h> #include <linux/bootmem.h> #include <linux/init.h> @@ -1153,6 +1155,22 @@ static int __init early_numa(char *p) } early_param("numa", early_numa); +static bool topology_updates_enabled = true; + +static int __init early_topology_updates(char *p) +{ + if (!p) + return 0; + + if (!strcmp(p, "off")) { + pr_info("Disabling topology updates\n"); + topology_updates_enabled = false; + } + + return 0; +} +early_param("topology_updates", early_topology_updates); + #ifdef CONFIG_MEMORY_HOTPLUG /* * Find the node associated with a hot added memory section for @@ -1539,6 +1557,9 @@ int arch_update_cpu_topology(void) struct device *dev; int weight, new_nid, i = 0; + if (!prrn_enabled && !vphn_enabled) + return 0; + weight = cpumask_weight(&cpu_associativity_changes_mask); if (!weight) return 0; @@ -1592,6 +1613,15 @@ int arch_update_cpu_topology(void) cpu = cpu_last_thread_sibling(cpu); } + pr_debug("Topology update for the following CPUs:\n"); + if (cpumask_weight(&updated_cpus)) { + for (ud = &updates[0]; ud; ud = ud->next) { + pr_debug("cpu %d moving from node %d " + "to %d\n", ud->cpu, + ud->old_nid, ud->new_nid); + } + } + /* * In cases where we have nothing to update (because the updates list * is too short or because the new topology is same as the old one), @@ -1800,7 +1830,10 @@ static const struct file_operations topology_ops = { static int topology_update_init(void) { - start_topology_update(); + /* Do not poll for changes if disabled at boot */ + if (topology_updates_enabled) + start_topology_update(); + if (!proc_create("powerpc/topology_updates", 0644, NULL, &topology_ops)) return -ENOMEM; |