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SubjectRe: [PATCH 1/3] Reintroduce zone_reclaim_interval for when zone_reclaim() scans and fails to avoid CPU spinning at 100% on NUMA
On Mon, Jun 08, 2009 at 10:33:41AM -0400, Christoph Lameter wrote:
> On Mon, 8 Jun 2009, Mel Gorman wrote:
> > Yes, they're on separate LRU lists but they are not the only pages on those
> > lists. The tmpfs pages are mixed in together with anonymous pages so we
> > cannot use NR_*_ANON.
> The tmpfs pages are unreclaimable and therefore should not be on the anon
> lru.

tmpfs pages can be swap-backed so can be reclaimable. Regardless of what
list they are on, we still need to know how many of them there are if
this patch is to be avoided.

Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab

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