diff options
Diffstat (limited to 'mm/slab.c')
| -rw-r--r-- | mm/slab.c | 39 |
1 files changed, 27 insertions, 12 deletions
diff --git a/mm/slab.c b/mm/slab.c index 83311c9aaf9..4ef42baf66f 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -479,11 +479,13 @@ EXPORT_SYMBOL(slab_buffer_size); #endif /* - * Do not go above this order unless 0 objects fit into the slab. + * Do not go above this order unless 0 objects fit into the slab or + * overridden on the command line. */ -#define BREAK_GFP_ORDER_HI 1 -#define BREAK_GFP_ORDER_LO 0 -static int slab_break_gfp_order = BREAK_GFP_ORDER_LO; +#define SLAB_MAX_ORDER_HI 1 +#define SLAB_MAX_ORDER_LO 0 +static int slab_max_order = SLAB_MAX_ORDER_LO; +static bool slab_max_order_set __initdata; /* * Functions for storing/retrieving the cachep and or slab from the page @@ -852,6 +854,17 @@ static int __init noaliencache_setup(char *s) } __setup("noaliencache", noaliencache_setup); +static int __init slab_max_order_setup(char *str) +{ + get_option(&str, &slab_max_order); + slab_max_order = slab_max_order < 0 ? 0 : + min(slab_max_order, MAX_ORDER - 1); + slab_max_order_set = true; + + return 1; +} +__setup("slab_max_order=", slab_max_order_setup); + #ifdef CONFIG_NUMA /* * Special reaping functions for NUMA systems called from cache_reap(). @@ -1500,10 +1513,11 @@ void __init kmem_cache_init(void) /* * Fragmentation resistance on low memory - only use bigger - * page orders on machines with more than 32MB of memory. + * page orders on machines with more than 32MB of memory if + * not overridden on the command line. */ - if (totalram_pages > (32 << 20) >> PAGE_SHIFT) - slab_break_gfp_order = BREAK_GFP_ORDER_HI; + if (!slab_max_order_set && totalram_pages > (32 << 20) >> PAGE_SHIFT) + slab_max_order = SLAB_MAX_ORDER_HI; /* Bootstrap is tricky, because several objects are allocated * from caches that do not exist yet: @@ -1930,8 +1944,8 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp) /* Print header */ if (lines == 0) { printk(KERN_ERR - "Slab corruption: %s start=%p, len=%d\n", - cachep->name, realobj, size); + "Slab corruption (%s): %s start=%p, len=%d\n", + print_tainted(), cachep->name, realobj, size); print_objinfo(cachep, objp, 0); } /* Hexdump the affected line */ @@ -2115,7 +2129,7 @@ static size_t calculate_slab_order(struct kmem_cache *cachep, * Large number of objects is good, but very large slabs are * currently bad for the gfp()s. */ - if (gfporder >= slab_break_gfp_order) + if (gfporder >= slab_max_order) break; /* @@ -3040,8 +3054,9 @@ static void check_slabp(struct kmem_cache *cachep, struct slab *slabp) if (entries != cachep->num - slabp->inuse) { bad: printk(KERN_ERR "slab: Internal list corruption detected in " - "cache '%s'(%d), slabp %p(%d). Hexdump:\n", - cachep->name, cachep->num, slabp, slabp->inuse); + "cache '%s'(%d), slabp %p(%d). Tainted(%s). Hexdump:\n", + cachep->name, cachep->num, slabp, slabp->inuse, + print_tainted()); print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, slabp, sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t), 1); |