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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>
This commit is contained in:
Gavin Shan 2012-07-31 16:46:02 -07:00 committed by Linus Torvalds
parent b214514592
commit 5b760e64a6
1 changed files with 4 additions and 6 deletions
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10
mm/sparse.c
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@ -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;
}