mprotect() and working set sampling optimizations

Ok, people suggested to split out the change_protection() modification
into a third patch.

This series implements an mprotect() optimization that also
helps improve the quality of working set scanning:

  - working set scanning gets faster

  - we can scan with a touched-page rate, instead of with a
    virtual-memory proportional rate (within limits).

This is already part of numa/core, but wanted to send it out
separately as well, to get specific feedback for the mprotect()
bits.

Thanks,

	Ingo

---
Ingo Molnar (1):
  mm: Optimize the TLB flush of sys_mprotect() and change_protection()
    users

Peter Zijlstra (2):
  mm: Count the number of pages affected in change_protection()
  sched, numa, mm: Count WS scanning against present PTEs, not virtual
    memory ranges

 include/linux/hugetlb.h |  8 ++++++--
 include/linux/mm.h      |  6 +++---
 kernel/sched/fair.c     | 37 +++++++++++++++++++++----------------
 mm/hugetlb.c            | 10 ++++++++--
 mm/mprotect.c           | 46 ++++++++++++++++++++++++++++++++++------------
 5 files changed, 72 insertions(+), 35 deletions(-)

-- 
1.7.11.7

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