linux-kernel - [PATCH part2 3/4] x86, mm, numa, acpi: Consider hotplug info when cleanup numa

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Message-Id: <1363857676-30694-4-git-send-email-tangchen@cn.fujitsu.com>
Date:	Thu, 21 Mar 2013 17:21:15 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	rob@...dley.net, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, yinghai@...nel.org, akpm@...ux-foundation.org,
	wency@...fujitsu.com, trenn@...e.de, liwanp@...ux.vnet.ibm.com,
	mgorman@...e.de, walken@...gle.com, riel@...hat.com,
	khlebnikov@...nvz.org, tj@...nel.org, minchan@...nel.org,
	m.szyprowski@...sung.com, mina86@...a86.com, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, linfeng@...fujitsu.com,
	jiang.liu@...wei.com, kosaki.motohiro@...fujitsu.com,
	guz.fnst@...fujitsu.com
Cc:	x86@...nel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH part2 3/4] x86, mm, numa, acpi: Consider hotplug info when cleanup numa_meminfo.

Since we have introduced hotplug info into struct numa_meminfo, we need
to consider it when cleanup numa_meminfo.

The original logic in numa_cleanup_meminfo() is:
Merge blocks on the same node, holes between which don't overlap with
memory on other nodes.

This patch modifies numa_cleanup_meminfo() logic like this:
Merge blocks with the same hotpluggable type on the same node, holes
between which don't overlap with memory on other nodes.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
---
 arch/x86/mm/numa.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 5f98bb5..0c3a278 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -304,18 +304,22 @@ int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
 			}
 
 			/*
-			 * Join together blocks on the same node, holes
-			 * between which don't overlap with memory on other
-			 * nodes.
+			 * Join together blocks on the same node, with the same
+			 * hotpluggable flags, holes between which don't overlap
+			 * with memory on other nodes.
 			 */
 			if (bi->nid != bj->nid)
 				continue;
+			if (bi->hotpluggable != bj->hotpluggable)
+				continue;
+
 			start = min(bi->start, bj->start);
 			end = max(bi->end, bj->end);
 			for (k = 0; k < mi->nr_blks; k++) {
 				struct numa_memblk *bk = &mi->blk[k];
 
-				if (bi->nid == bk->nid)
+				if (bi->nid == bk->nid &&
+				    bi->hotpluggable == bk->hotpluggable)
 					continue;
 				if (start < bk->end && end > bk->start)
 					break;
@@ -335,6 +339,7 @@ int __init numa_cleanup_meminfo(struct numa_meminfo *mi)
 	for (i = mi->nr_blks; i < ARRAY_SIZE(mi->blk); i++) {
 		mi->blk[i].start = mi->blk[i].end = 0;
 		mi->blk[i].nid = NUMA_NO_NODE;
+		mi->blk[i].hotpluggable = false;
 	}
 
 	return 0;
-- 
1.7.1

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