Re: [PATCH 5/7] Add /proc trigger for memory compaction

From: Christoph Lameter
Date: Wed Jan 20 2010 - 13:13:54 EST

On Wed, 20 Jan 2010, Mel Gorman wrote:

> True, although the per-node structures are only available on NUMA making
> it necessary to have two interfaces. The per-node one is handy enough
> because it would be just
> /sys/devices/system/node/nodeX/compact_node
> When written to, this node is compacted by the writing process
> But there does not appear to be a "good" way of having a non-NUMA
> interface. /sys/devices/system/node does not exist .... Does anyone
> remember why !NUMA does not have a /sys/devices/system/node/node0? Is
> there a good reason or was there just no point?

We could create a fake node0 for the !NUMA case I guess? Dont see a major
reason why not to do it aside from scripts that may check for the presence
of the file to switch to a "NUMA" mode.

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