Documentation/sysctl/vm.txt: update numa_zonelist_order description (7c88a292) · Commits · 戴 / test

Commit ("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@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:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

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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