The patch titled
Subject: Documentation/sysctl/vm.txt: update numa_zonelist_order description
has been added to the -mm tree. Its filename is
mm-update-the-document-of-numa_zonelist_order.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-update-the-document-of-numa_zonelist_order.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-update-the-document-of-numa_zonelist_order.patch
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------------------------------------------------------
From: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Subject: Documentation/sysctl/vm.txt: update numa_zonelist_order description
3193913ce62c ("mm: page_alloc: default node-ordering on 64-bit NUMA,
zone-ordering on 32-bit") changes the default value of
numa_zonelist_order. Update the document.
Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: "Rik van Riel" <riel@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: "Kamezawa Hiroyuki" <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/sysctl/vm.txt | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff -puN Documentation/sysctl/vm.txt~mm-update-the-document-of-numa_zonelist_order Documentation/sysctl/vm.txt
--- a/Documentation/sysctl/vm.txt~mm-update-the-document-of-numa_zonelist_order
+++ a/Documentation/sysctl/vm.txt
@@ -581,15 +581,16 @@ Specify "[Nn]ode" for node order
"Zone Order" orders the zonelists by zone type, then by node within each
zone. Specify "[Zz]one" for zone order.
-Specify "[Dd]efault" to request automatic configuration. Autoconfiguration
-will select "node" order in following case.
-(1) if the DMA zone does not exist or
-(2) if the DMA zone comprises greater than 50% of the available memory or
-(3) if any node's DMA zone comprises greater than 70% of its local memory and
- the amount of local memory is big enough.
+Specify "[Dd]efault" to request automatic configuration.
-Otherwise, "zone" order will be selected. Default order is recommended unless
-this is causing problems for your system/application.
+On 32-bit, the Normal zone needs to be preserved for allocations accessible
+by the kernel, so "zone" order will be selected.
+
+On 64-bit, devices that require DMA32/DMA are relatively rare, so "node"
+order will be selected.
+
+Default order is recommended unless this is causing problems for your
+system/application.
==============================================================
_
Patches currently in -mm which might be from qiuxishi@xxxxxxxxxx are
mm-update-the-document-of-numa_zonelist_order.patch
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