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authorGavin Shan <shangw@linux.vnet.ibm.com>2012-07-31 16:46:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-31 18:42:49 -0700
commit5b760e64a64c8940cdccd0ba6fce19a9bd010d20 (patch)
treeb4765cd744dd5710ba6cd4d784185247dc317cef /mm/sparse.c
parentb214514592d2dcb0b9d14ee8dd14f3699e3b0a84 (diff)
downloadlinux-5b760e64a64c8940cdccd0ba6fce19a9bd010d20.tar.gz
mm/sparse: optimize sparse_index_alloc
With CONFIG_SPARSEMEM_EXTREME, the two levels of memory section descriptors are allocated from slab or bootmem. When allocating from slab, let slab/bootmem allocator clear the memory chunk. We needn't clear it explicitly. Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/sparse.c')
-rw-r--r--mm/sparse.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/mm/sparse.c b/mm/sparse.c
index 950981fd07c..fa933f43b2c 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -65,14 +65,12 @@ static struct mem_section noinline __init_refok *sparse_index_alloc(int nid)
if (slab_is_available()) {
if (node_state(nid, N_HIGH_MEMORY))
- section = kmalloc_node(array_size, GFP_KERNEL, nid);
+ section = kzalloc_node(array_size, GFP_KERNEL, nid);
else
- section = kmalloc(array_size, GFP_KERNEL);
- } else
+ section = kzalloc(array_size, GFP_KERNEL);
+ } else {
section = alloc_bootmem_node(NODE_DATA(nid), array_size);
-
- if (section)
- memset(section, 0, array_size);
+ }
return section;
}