Lumpy reclaim had a purpose but in the mind of some, it was to kick
the system so hard it trashed. For others the purpose was to complicate
vmscan.c. Over time it was giving softer shoes and a nicer attitude but
memory compaction needs to step up and replace it so this patch sends
lumpy reclaim to the farm.
The tracepoint format changes for isolating LRU pages with this patch
applied. Furthermore reclaim/compaction can no longer queue dirty pages in
pageout() if the underlying BDI is congested. Lumpy reclaim used this logic
and reclaim/compaction was using it in error.
Signed-off-by: Mel Gorman<mgorman@xxxxxxx>