Commit 07ed76b2 authored by Jack Steiner's avatar Jack Steiner Committed by Linus Torvalds
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[PATCH] slab: allocate larger cache_cache if order 0 fails

kmem_cache_init() incorrectly assumes that the cache_cache object will fit
in an order 0 allocation.  On very large systems, this is not true.  Change
the code to try larger order allocations if order 0 fails.

Signed-off-by: default avatarJack Steiner <>
Cc: Manfred Spraul <>
Cc: Pekka Enberg <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 731805b4
......@@ -1124,6 +1124,7 @@ void __init kmem_cache_init(void)
struct cache_sizes *sizes;
struct cache_names *names;
int i;
int order;
for (i = 0; i < NUM_INIT_LISTS; i++) {
......@@ -1167,11 +1168,15 @@ void __init kmem_cache_init(void)
cache_cache.buffer_size = ALIGN(cache_cache.buffer_size, cache_line_size());
cache_estimate(0, cache_cache.buffer_size, cache_line_size(), 0,
&left_over, &cache_cache.num);
for (order = 0; order < MAX_ORDER; order++) {
cache_estimate(order, cache_cache.buffer_size,
cache_line_size(), 0, &left_over, &cache_cache.num);
if (cache_cache.num)
if (!cache_cache.num)
cache_cache.gfporder = order;
cache_cache.colour = left_over / cache_cache.colour_off;
cache_cache.slab_size = ALIGN(cache_cache.num * sizeof(kmem_bufctl_t) +
sizeof(struct slab), cache_line_size());
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