> Secondly we modify the dirty limit calculation to be based
> on the acctive cpuset.
The global dirty limit definitely seems to be a problem
in several cases, but my feeling is that the cpuset is the wrong unit
to keep track of it. Most likely it should be more fine grained.
> If we are in a cpuset then we select only inodes for writeback
> that have pages on the nodes of the cpuset.
Is there any indication this change helps on smaller systems
or is it purely a large system optimization?
> B. We add a new counter NR_UNRECLAIMABLE that is subtracted
> from the available pages in a node. This allows us to
> accurately calculate the dirty ratio even if large portions
> of the node have been allocated for huge pages or for
> slab pages.
That sounds like a useful change by itself.
-Andi
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