linux-kernel - [RFC PATCH v2 17/25] x86: memlayout: add a arch specific inital memlayout setter.

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Message-Id: <1365729237-29711-18-git-send-email-cody@linux.vnet.ibm.com>
Date:	Thu, 11 Apr 2013 18:13:49 -0700
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Simon Jeons <simon.jeons@...il.com>
Subject: [RFC PATCH v2 17/25] x86: memlayout: add a arch specific inital memlayout setter.

On x86, we have numa_info specifically to track the numa layout, which
is precisely the data memlayout needs, so use it to create an initial
memlayout.

Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
---
 arch/x86/mm/numa.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index a71c4e2..75819ef 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -11,6 +11,7 @@
 #include <linux/nodemask.h>
 #include <linux/sched.h>
 #include <linux/topology.h>
+#include <linux/dnuma.h>
 
 #include <asm/e820.h>
 #include <asm/proto.h>
@@ -32,6 +33,33 @@ __initdata
 #endif
 ;
 
+#ifdef CONFIG_DYNAMIC_NUMA
+void __init memlayout_global_init(void)
+{
+	struct numa_meminfo *mi = &numa_meminfo;
+	int i;
+	struct numa_memblk *blk;
+	struct memlayout *ml = memlayout_create(ML_INITIAL);
+	if (WARN_ON(!ml))
+		return;
+
+	pr_devel("x86/memlayout: adding ranges from numa_meminfo\n");
+	for (i = 0; i < mi->nr_blks; i++) {
+		blk = mi->blk + i;
+		pr_devel("  adding range {%LX[%LX]-%LX[%LX]}:%d\n",
+			 PFN_DOWN(blk->start), blk->start,
+			 PFN_DOWN(blk->end - PAGE_SIZE / 2 - 1),
+			 blk->end - 1, blk->nid);
+		memlayout_new_range(ml, PFN_DOWN(blk->start),
+				PFN_DOWN(blk->end - PAGE_SIZE / 2 - 1),
+				blk->nid);
+	}
+	pr_devel("  done adding ranges from numa_meminfo\n");
+
+	memlayout_commit(ml);
+}
+#endif
+
 static int numa_distance_cnt;
 static u8 *numa_distance;
 
-- 
1.8.2.1

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