• Mel Gorman's avatar
    mm: numa: Add THP migration for the NUMA working set scanning fault case. · b32967ff
    Mel Gorman authored
    Note: This is very heavily based on a patch from Peter Zijlstra with
    	fixes from Ingo Molnar, Hugh Dickins and Johannes Weiner.  That patch
    	put a lot of migration logic into mm/huge_memory.c where it does
    	not belong. This version puts tries to share some of the migration
    	logic with migrate_misplaced_page.  However, it should be noted
    	that now migrate.c is doing more with the pagetable manipulation
    	than is preferred. The end result is barely recognisable so as
    	before, the signed-offs had to be removed but will be re-added if
    	the original authors are ok with it.
    
    Add THP migration for the NUMA working set scanning fault case.
    
    It uses the page lock to serialize. No migration pte dance is
    necessary because the pte is already unmapped when we decide
    to migrate.
    
    [dhillf@gmail.com: Fix memory leak on isolation failure]
    [dhillf@gmail.com: Fix transfer of last_nid information]
    Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
    b32967ff
migrate.c 42.2 KB