From 5b760e64a64c8940cdccd0ba6fce19a9bd010d20 Mon Sep 17 00:00:00 2001 From: Gavin Shan Date: Tue, 31 Jul 2012 16:46:02 -0700 Subject: [PATCH] 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 Reviewed-by: Michal Hocko Acked-by: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/sparse.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/mm/sparse.c b/mm/sparse.c index 950981fd07c5..fa933f43b2c9 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; } -- 2.39.5