linux-kernel - [PATCH v2 5/5] page_alloc: Bootmem limit with movablecore

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Message-Id: <1353667445-7593-6-git-send-email-tangchen@cn.fujitsu.com>
Date:	Fri, 23 Nov 2012 18:44:05 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	hpa@...or.com, akpm@...ux-foundation.org, rob@...dley.net,
	isimatu.yasuaki@...fujitsu.com, tangchen@...fujitsu.com,
	laijs@...fujitsu.com, wency@...fujitsu.com, linfeng@...fujitsu.com,
	jiang.liu@...wei.com, yinghai@...nel.org,
	kosaki.motohiro@...fujitsu.com, minchan.kim@...il.com,
	mgorman@...e.de, rientjes@...gle.com, rusty@...tcorp.com.au
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-doc@...r.kernel.org
Subject: [PATCH v2 5/5] page_alloc: Bootmem limit with movablecore_map

This patch make sure bootmem will not allocate memory from areas that
may be ZONE_MOVABLE. The map info is from movablecore_map boot option.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Reviewed-by: Wen Congyang <wency@...fujitsu.com>
Tested-by: Lin Feng <linfeng@...fujitsu.com>
---
 include/linux/memblock.h |    1 +
 mm/memblock.c            |   15 ++++++++++++++-
 2 files changed, 15 insertions(+), 1 deletions(-)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index d452ee1..6e25597 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -42,6 +42,7 @@ struct memblock {
 
 extern struct memblock memblock;
 extern int memblock_debug;
+extern struct movablecore_map movablecore_map;
 
 #define memblock_dbg(fmt, ...) \
 	if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
diff --git a/mm/memblock.c b/mm/memblock.c
index 6259055..33b3b4d 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -101,6 +101,7 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
 {
 	phys_addr_t this_start, this_end, cand;
 	u64 i;
+	int curr = movablecore_map.nr_map - 1;
 
 	/* pump up @end */
 	if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
@@ -114,13 +115,25 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
 		this_start = clamp(this_start, start, end);
 		this_end = clamp(this_end, start, end);
 
-		if (this_end < size)
+restart:
+		if (this_end <= this_start || this_end < size)
 			continue;
 
+		for (; curr >= 0; curr--) {
+			if (movablecore_map.map[curr].start < this_end)
+				break;
+		}
+
 		cand = round_down(this_end - size, align);
+		if (curr >= 0 && cand < movablecore_map.map[curr].end) {
+			this_end = movablecore_map.map[curr].start;
+			goto restart;
+		}
+
 		if (cand >= this_start)
 			return cand;
 	}
+
 	return 0;
 }
 
-- 
1.7.1

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