linux-kernel - [PATCH, RFC 0/2] Recover some scalability for DAX

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Date:	Mon, 10 Aug 2015 18:14:22 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc:	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>,
	Jan Kara <jack@...e.cz>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH, RFC 0/2] Recover some scalability for DAX

Hi all,

Currently, i_mmap_lock is huge bottleneck for DAX scalability as we use in
place of lock_page().

This patchset tries to recover some scalability by introducing per-mapping
range-lock. The range-lock itself is implemented by Jan Kara on top of
interval tree. It looks not so cheap, by should scale better than
exclusive i_mmap_lock.

Any comments?

Jan Kara (1):
  lib: Implement range locks

Kirill A. Shutemov (1):
  dax: use range_lock instead of i_mmap_lock

 drivers/gpu/drm/Kconfig      |  1 -
 drivers/gpu/drm/i915/Kconfig |  1 -
 fs/dax.c                     | 30 +++++++++--------
 fs/inode.c                   |  1 +
 include/linux/fs.h           |  2 ++
 include/linux/range_lock.h   | 51 +++++++++++++++++++++++++++++
 lib/Kconfig                  | 14 --------
 lib/Kconfig.debug            |  1 -
 lib/Makefile                 |  3 +-
 lib/range_lock.c             | 78 ++++++++++++++++++++++++++++++++++++++++++++
 mm/memory.c                  | 35 +++++++++++++-------
 mm/rmap.c                    |  1 +
 12 files changed, 174 insertions(+), 44 deletions(-)
 create mode 100644 include/linux/range_lock.h
 create mode 100644 lib/range_lock.c

-- 
2.5.0

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