linux-kernel - [PATCH v4 13/14] of/numa: remove the constraint on the distances of node pairs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1465286898-13828-14-git-send-email-thunder.leizhen@huawei.com>
Date:	Tue, 7 Jun 2016 16:08:17 +0800
From:	Zhen Lei <thunder.leizhen@...wei.com>
To:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
	Robert Richter <rrichter@...ium.com>,
	"David Daney" <david.daney@...ium.com>,
	Rob Herring <robh+dt@...nel.org>,
	"Frank Rowand" <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
	"Tianhong Ding" <dingtianhong@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH v4 13/14] of/numa: remove the constraint on the distances of node pairs

At present, the distances must equal in both direction for each node
pairs. For example: the distance of node B->A must the same to A->B.
But we really don't have to do this.

End up fill default distances as below:
1. If both direction specified, keep no change.
2. If only one direction specified, assign it to the other direction.
3. If none of the two direction specified, both are assigned to
   REMOTE_DISTANCE.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 drivers/of/of_numa.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/of/of_numa.c b/drivers/of/of_numa.c
index 019738f..ce782f9 100644
--- a/drivers/of/of_numa.c
+++ b/drivers/of/of_numa.c
@@ -122,15 +122,25 @@ static int __init of_numa_parse_distance_map_v1(struct device_node *map)
 		numa_set_distance(nodea, nodeb, distance);
 		pr_debug("distance[node%d -> node%d] = %d\n",
 			 nodea, nodeb, distance);
-
-		/* Set default distance of node B->A same as A->B */
-		if (nodeb > nodea)
-			numa_set_distance(nodeb, nodea, distance);
 	}

 	return 0;
 }

+static void __init fill_default_distances(void)
+{
+	int i, j;
+
+	for (i = 0; i < nr_node_ids; i++)
+		for (j = 0; j < nr_node_ids; j++)
+			if (i == j)
+				numa_set_distance(i, j, LOCAL_DISTANCE);
+			else if (!node_distance(i, j))
+				numa_set_distance(i, j,
+				    node_distance(j, i) ? : REMOTE_DISTANCE);
+
+}
+
 static int __init of_numa_parse_distance_map(void)
 {
 	int ret = 0;
@@ -140,8 +150,10 @@ static int __init of_numa_parse_distance_map(void)
 				     "numa-distance-map-v1");
 	if (np)
 		ret = of_numa_parse_distance_map_v1(np);
-
 	of_node_put(np);
+
+	fill_default_distances();
+
 	return ret;
 }

--
2.5.0