linux-kernel - [PATCH 0/3, v2] mprotect() and working set sampling optimizations

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Message-Id: <1352884731-20024-1-git-send-email-mingo@kernel.org>
Date:	Wed, 14 Nov 2012 10:18:48 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Paul Turner <pjt@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hugh Dickins <hughd@...gle.com>
Subject: [PATCH 0/3, v2] 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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