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>
diff --git a/mm/sparse.c b/mm/sparse.c
index 950981f..fa933f4 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -65,14 +65,12 @@
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;
}
