linux-kernel - [PATCH] x86, mm: Avoid extra pxm_to

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Date:	Sun, 26 Jan 2014 01:10:15 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Toshi Kani <toshi.kani@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH] x86, mm: Avoid extra pxm_to_node()

In slit init code, more pxm_to_node() calling are added.

We can cache return with from_node/to_node to avoid them.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
 
---
 arch/x86/mm/srat.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

Index: linux-2.6/arch/x86/mm/srat.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/srat.c
+++ linux-2.6/arch/x86/mm/srat.c
@@ -50,14 +50,19 @@ static __init inline int srat_disabled(v
 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 {
 	int i, j;
+	int from_node, to_node;
 
 	for (i = 0; i < slit->locality_count; i++) {
-		if (pxm_to_node(i) == NUMA_NO_NODE)
+		from_node = pxm_to_node(i);
+		if (from_node == NUMA_NO_NODE)
 			continue;
+
 		for (j = 0; j < slit->locality_count; j++) {
-			if (pxm_to_node(j) == NUMA_NO_NODE)
+			to_node = pxm_to_node(j);
+			if (to_node == NUMA_NO_NODE)
 				continue;
-			numa_set_distance(pxm_to_node(i), pxm_to_node(j),
+
+			numa_set_distance(from_node, to_node,
 				slit->entry[slit->locality_count * i + j]);
 		}
 	}
--
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