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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
Mel Gorman wrote:

> The scanning occurs because zone_reclaim() cannot tell
> in advance the scan is pointless because the counters do not distinguish
> between pagecache pages backed by disk and by RAM.

Yes it can. Since 2.6.27, filesystem backed and swap/ram backed
pages have been living on separate LRU lists. This allows you to
fix the underlying problem, instead of having to add a retry
interval.

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