linux-kernel - [PATCH] x86: don't reallocate pgt for node0

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Message-Id: <200806301834.59156.yhlu.kernel@gmail.com>
Date:	Mon, 30 Jun 2008 18:34:58 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: don't reallocate pgt for node0


kva ram already mapped right after away, so don't need to get that for low ram.
avoid wasting one copy pgdat.

also add node id in early_res name in case get it from find_e820_area.

Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

---
 arch/x86/mm/discontig_32.c |   11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

Index: linux-2.6/arch/x86/mm/discontig_32.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/discontig_32.c
+++ linux-2.6/arch/x86/mm/discontig_32.c
@@ -156,17 +156,20 @@ static void __init propagate_e820_map_no
  */
 static void __init allocate_pgdat(int nid)
 {
-	if (nid && node_has_online_mem(nid) && node_remap_start_vaddr[nid])
+	char buf[16];
+
+	if (node_has_online_mem(nid) && node_remap_start_vaddr[nid])
 		NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
 	else {
 		unsigned long pgdat_phys;
 		pgdat_phys = find_e820_area(min_low_pfn<<PAGE_SHIFT,
-				 (nid ? max_low_pfn:max_pfn_mapped)<<PAGE_SHIFT,
+				 max_pfn_mapped<<PAGE_SHIFT,
 				 sizeof(pg_data_t),
 				 PAGE_SIZE);
 		NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT));
-		reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t),
-			      "NODE_DATA");
+		memset(buf, 0, sizeof(buf));
+		sprintf(buf, "NODE_DATA %d",  nid);
+		reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t), buf);
 	}
 	printk(KERN_DEBUG "allocate_pgdat: node %d NODE_DATA %08lx\n",
 		nid, (unsigned long)NODE_DATA(nid));
--
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