mm: update the document of numa_zonelist_order
Subsystems (2)
PATCH 1/1 mm: update the document of numa_zonelist_order
commit 3193913ce62c63056bc67a6ae378beaf494afa66 change the default value of numa_zonelist_order, this patch update the document.
Signed-off-by Xishi Qiu <[email protected]>
--- Documentation/sysctl/vm.txt | 19 ++++++++++--------- 1 files changed, 10 insertions(+), 9 deletions(-)
Documentation/sysctl/vm.txt +10 -9
@@ -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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