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[RFC PATCH 0/4] Automatic NUMA balancing and PROT_NONE handling followup

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: [RFC PATCH 0/4] Automatic NUMA balancing and PROT_NONE handling followup v2r8
From: Mel Gorman <mgorman@xxxxxxx>
Date: Sat, 7 Mar 2015 15:20:47 +0000
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Aneesh Kumar <aneesh.kumar@xxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, xfs@xxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, Mel Gorman <mgorman@xxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
Dave Chinner reported a problem due to excessive NUMA balancing activity
and bisected it. The first patch in this series corrects a major problem
that is unlikely to affect Dave but is still serious. Patch 2 is a minor
cleanup that was spotted while looking at scan rate control. Patch 3 is
minor and unlikely to make a difference but is still an inconsistentcy
between base and THP handling. Patch 4 is the important one, it slows
PTE scan updates if migrations are failing or throttled. Details of the
performance impact on local tests is included in the patch.

 include/linux/migrate.h |  5 -----
 include/linux/sched.h   |  9 +++++----
 kernel/sched/fair.c     |  8 ++++++--
 mm/huge_memory.c        |  8 +++++---
 mm/memory.c             |  3 ++-
 mm/migrate.c            | 20 --------------------
 6 files changed, 18 insertions(+), 35 deletions(-)

-- 
2.1.2

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