linux-kernel - [PATCH 1/4] x86, numa: Do not scan two times for setup_node

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Date:	Fri, 18 Feb 2011 10:59:03 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Tejun Heo <tj@...nel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Rientjes <rientjes@...gle.com>,
	Cyrill Gorcunov <gorcunov@...il.com>
Subject: [PATCH 1/4] x86, numa: Do not scan two times for setup_node_bootmem()


We don't need to scan two times for setup_node_bootmem()
because We are using mapped memblock for node_data finding already.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/mm/numa_64.c |   31 +++++++++++++------------------
 1 file changed, 13 insertions(+), 18 deletions(-)

Index: linux-2.6/arch/x86/mm/numa_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/numa_64.c
+++ linux-2.6/arch/x86/mm/numa_64.c
@@ -480,7 +480,7 @@ static bool __init numa_meminfo_cover_me
 
 static int __init numa_register_memblks(struct numa_meminfo *mi)
 {
-	int i, j, nid;
+	int i, nid;
 
 	/* Account for nodes with cpus and no memory */
 	node_possible_map = numa_nodes_parsed;
@@ -507,27 +507,22 @@ static int __init numa_register_memblks(
 	init_memory_mapping_high();
 
 	/*
-	 * Finally register nodes.  Do it twice in case setup_node_bootmem
-	 * missed one due to missing bootmem.
+	 * Do not do that twice, not needed!
+	 *   We are using mapped memblock directly for node data
 	 */
-	for (i = 0; i < 2; i++) {
-		for_each_node_mask(nid, node_possible_map) {
-			u64 start = (u64)max_pfn << PAGE_SHIFT;
-			u64 end = 0;
+	for_each_node_mask(nid, node_possible_map) {
+		u64 start = (u64)max_pfn << PAGE_SHIFT;
+		u64 end = 0;
 
-			if (node_online(nid))
+		for (i = 0; i < mi->nr_blks; i++) {
+			if (nid != mi->blk[i].nid)
 				continue;
-
-			for (j = 0; j < mi->nr_blks; j++) {
-				if (nid != mi->blk[j].nid)
-					continue;
-				start = min(mi->blk[j].start, start);
-				end = max(mi->blk[j].end, end);
-			}
-
-			if (start < end)
-				setup_node_bootmem(nid, start, end);
+			start = min(mi->blk[i].start, start);
+			end = max(mi->blk[i].end, end);
 		}
+
+		if (start < end)
+			setup_node_bootmem(nid, start, end);
 	}
 
 	return 0;
--
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