From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx179.postini.com [74.125.245.179]) by kanga.kvack.org (Postfix) with SMTP id 047696B005A for ; Wed, 27 Jun 2012 12:45:27 -0400 (EDT) Received: from /spool/local by e8.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 27 Jun 2012 12:45:26 -0400 Received: from d01relay01.pok.ibm.com (d01relay01.pok.ibm.com [9.56.227.233]) by d01dlp01.pok.ibm.com (Postfix) with ESMTP id F3FBE38C87A5 for ; Wed, 27 Jun 2012 12:36:21 -0400 (EDT) Received: from d01av04.pok.ibm.com (d01av04.pok.ibm.com [9.56.224.64]) by d01relay01.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q5RGaLBJ145116 for ; Wed, 27 Jun 2012 12:36:21 -0400 Received: from d01av04.pok.ibm.com (loopback [127.0.0.1]) by d01av04.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q5RGaLSU020749 for ; Wed, 27 Jun 2012 12:36:21 -0400 From: Gavin Shan Subject: [PATCH v2 1/3] mm/sparse: optimize sparse_index_alloc Date: Thu, 28 Jun 2012 00:36:06 +0800 Message-Id: <1340814968-2948-1-git-send-email-shangw@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: mhocko@suse.cz, dave@linux.vnet.ibm.com, rientjes@google.com, hannes@cmpxchg.org, akpm@linux-foundation.org, Gavin Shan With CONFIG_SPARSEMEM_EXTREME, the two level of memory section descriptors are allocated from slab or bootmem. When allocating from slab, let slab/bootmem allocator to clear the memory chunk. We needn't clear that explicitly. Signed-off-by: Gavin Shan Reviewed-by: Michal Hocko --- mm/sparse.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/mm/sparse.c b/mm/sparse.c index 6a4bf91..781fa04 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; } -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org