linux-kernel - [PATCH v5 22/22] x86, mm, numa: Put pagetable on local node ram for 64bit

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Date:	Fri, 14 Jun 2013 17:56:40 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Thomas Renninger <trenn@...e.de>,
	Tang Chen <tangchen@...fujitsu.com>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
	Pekka Enberg <penberg@...nel.org>,
	Jacob Shin <jacob.shin@....com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH v5 22/22] x86, mm, numa: Put pagetable on local node ram for 64bit

If node with ram is hotplugable, local node mem for page table and vmemmap
should be on that node ram.

This patch is some kind of refreshment of
| commit 1411e0ec3123ae4c4ead6bfc9fe3ee5a3ae5c327
| Date:   Mon Dec 27 16:48:17 2010 -0800
|
|    x86-64, numa: Put pgtable to local node memory
That was reverted before.

We have reason to reintroduce it to make memory hotplug work.

Calling init_mem_mapping in early_initmem_init for every node.
alloc_low_pages will alloc page table in following order:
	BRK, local node, low range
So page table will be on low range or local nodes.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: Jacob Shin <jacob.shin@....com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Reviewed-by: Tang Chen <tangchen@...fujitsu.com>
Tested-by: Tang Chen <tangchen@...fujitsu.com>
---
 arch/x86/mm/numa.c | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 9b18ee8..5adf803 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -670,7 +670,39 @@ static void __init early_x86_numa_init(void)
 #ifdef CONFIG_X86_64
 static void __init early_x86_numa_init_mapping(void)
 {
-	init_mem_mapping(0, max_pfn << PAGE_SHIFT);
+	unsigned long last_start = 0, last_end = 0;
+	struct numa_meminfo *mi = &numa_meminfo;
+	unsigned long start, end;
+	int last_nid = -1;
+	int i, nid;
+
+	for (i = 0; i < mi->nr_blks; i++) {
+		nid   = mi->blk[i].nid;
+		start = mi->blk[i].start;
+		end   = mi->blk[i].end;
+
+		if (last_nid == nid) {
+			last_end = end;
+			continue;
+		}
+
+		/* other nid now */
+		if (last_nid >= 0) {
+			printk(KERN_DEBUG "Node %d: [mem %#016lx-%#016lx]\n",
+					last_nid, last_start, last_end - 1);
+			init_mem_mapping(last_start, last_end);
+		}
+
+		/* for next nid */
+		last_nid   = nid;
+		last_start = start;
+		last_end   = end;
+	}
+	/* last one */
+	printk(KERN_DEBUG "Node %d: [mem %#016lx-%#016lx]\n",
+			last_nid, last_start, last_end - 1);
+	init_mem_mapping(last_start, last_end);
+
 	if (max_pfn > max_low_pfn)
 		max_low_pfn = max_pfn;
 }
-- 
1.8.1.4

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