Re: [PATCH 37/46] mm: numa: Add THP migration for the NUMA workingset scanning fault case.

[Mel Gorman]

On Wed, Nov 21, 2012 at 10:21:43AM +0000, Mel Gorman wrote:
> 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.
> 
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
> ---
>  include/linux/migrate.h |   16 ++++
>  mm/huge_memory.c        |   55 +++++++-----
>  mm/internal.h           |    2 +
>  mm/migrate.c            |  212 ++++++++++++++++++++++++++++++++++++++---------
>  4 files changed, 226 insertions(+), 59 deletions(-)
> 

And now that I've released it I see that this almost certainly broke
memcg as the memcontrol.c bits are missing. I'll need to carry them
over.

-- 
Mel Gorman
SUSE Labs
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