- block_dump
- drop-caches
- zone_reclaim_mode
-- zone_reclaim_interval
+- min_unmapped_ratio
- panic_on_oom
==============================================================
shrink operation is global, may take a long time and free slabs
in all nodes of the system.
-================================================================
+=============================================================
-zone_reclaim_interval:
+min_unmapped_ratio:
-The time allowed for off node allocations after zone reclaim
-has failed to reclaim enough pages to allow a local allocation.
+This is available only on NUMA kernels.
-Time is set in seconds and set by default to 30 seconds.
+A percentage of the file backed pages in each zone. Zone reclaim will only
+occur if more than this percentage of pages are file backed and unmapped.
+This is to insure that a minimal amount of local pages is still available for
+file I/O even if the node is overallocated.
-Reduce the interval if undesired off node allocations occur. However, too
-frequent scans will have a negative impact onoff node allocation performance.
+The default is 1 percent.
=============================================================