* Ingo Molnar <mingo@xxxxxxxxxx> wrote:
* Mel Gorman <mgorman@xxxxxxx> wrote:
From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Note: This was originally based on Peter's patch "mm/migrate: Introduce
migrate_misplaced_page()" but borrows extremely heavily from Andrea's
"autonuma: memory follows CPU algorithm and task/mm_autonuma stats
collection". The end result is barely recognisable so signed-offs
had to be dropped. If original authors are ok with it, I'll
re-add the signed-off-bys.
Add migrate_misplaced_page() which deals with migrating pages from
faults.
Based-on-work-by: Lee Schermerhorn <Lee.Schermerhorn@xxxxxx>
Based-on-work-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Based-on-work-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
---
include/linux/migrate.h | 8 ++++
mm/migrate.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 110 insertions(+), 2 deletions(-)
That's a nice patch - the TASK_NUMA_FAULT approach in the
original patch was not very elegant.
I've started testing it to see how well your version works.
Hm, I'm seeing some instability - see the boot crash below. If I
undo your patch it goes away.
( To help debugging this I've attached migration.patch which
applies your patch on top of Peter's latest queue of patches.
If I revert this patch then the crash goes away. )
I've gone back to the well-tested page migration code from Peter
for the time being.