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| author | Mel Gorman <mgorman@suse.de> | 2012-11-22 11:16:36 +0000 |
|---|---|---|
| committer | Mel Gorman <mgorman@suse.de> | 2012-12-11 14:42:55 +0000 |
| commit | 1a687c2e9a99335c9e77392f050fe607fa18a652 (patch) | |
| tree | 06df958bfdfeaf9f38f333af106b55faa81f1c6b /mm/mempolicy.c | |
| parent | b8593bfda1652755136333cdd362de125b283a9c (diff) | |
| download | linux-1a687c2e9a99335c9e77392f050fe607fa18a652.tar.gz linux-1a687c2e9a99335c9e77392f050fe607fa18a652.tar.bz2 linux-1a687c2e9a99335c9e77392f050fe607fa18a652.zip | |
mm: sched: numa: Control enabling and disabling of NUMA balancing
This patch adds Kconfig options and kernel parameters to allow the
enabling and disabling of automatic NUMA balancing. The existance
of such a switch was and is very important when debugging problems
related to transparent hugepages and we should have the same for
automatic NUMA placement.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index fd20e28fd2ad..046308e9b999 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -2521,6 +2521,50 @@ void mpol_free_shared_policy(struct shared_policy *p) mutex_unlock(&p->mutex); } +#ifdef CONFIG_NUMA_BALANCING +static bool __initdata numabalancing_override; + +static void __init check_numabalancing_enable(void) +{ + bool numabalancing_default = false; + + if (IS_ENABLED(CONFIG_NUMA_BALANCING_DEFAULT_ENABLED)) + numabalancing_default = true; + + if (nr_node_ids > 1 && !numabalancing_override) { + printk(KERN_INFO "Enabling automatic NUMA balancing. " + "Configure with numa_balancing= or sysctl"); + set_numabalancing_state(numabalancing_default); + } +} + +static int __init setup_numabalancing(char *str) +{ + int ret = 0; + if (!str) + goto out; + numabalancing_override = true; + + if (!strcmp(str, "enable")) { + set_numabalancing_state(true); + ret = 1; + } else if (!strcmp(str, "disable")) { + set_numabalancing_state(false); + ret = 1; + } +out: + if (!ret) + printk(KERN_WARNING "Unable to parse numa_balancing=\n"); + + return ret; +} +__setup("numa_balancing=", setup_numabalancing); +#else +static inline void __init check_numabalancing_enable(void) +{ +} +#endif /* CONFIG_NUMA_BALANCING */ + /* assumes fs == KERNEL_DS */ void __init numa_policy_init(void) { @@ -2571,6 +2615,8 @@ void __init numa_policy_init(void) if (do_set_mempolicy(MPOL_INTERLEAVE, 0, &interleave_nodes)) printk("numa_policy_init: interleaving failed\n"); + + check_numabalancing_enable(); } /* Reset policy of current process to default */ |