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Commit 7c88a292 authored by Xishi Qiu's avatar Xishi Qiu Committed by Linus Torvalds
Browse files

Documentation/sysctl/vm.txt: update numa_zonelist_order description 



Commit 3193913c ("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: default avatarXishi Qiu <qiuxishi@huawei.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 33334e25

Documentation/sysctl/vm.txt

+10 −9
Original line number Diff line number Diff line
@@ -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.



Otherwise, "zone" order will be selected. Default order is recommended unless

this is causing problems for your system/application.

Specify "[Dd]efault" to request automatic configuration.



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.



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