linux-kernel - [PATCH 0/5] locking Introduce range reader/writer lock

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Date:   Mon,  6 Mar 2017 21:03:25 -0800
From:   Davidlohr Bueso <dave@...olabs.net>
To:     mingo@...nel.org, peterz@...radead.org, akpm@...ux-foundation.org
Cc:     jack@...e.cz, kirill.shutemov@...ux.intel.com, mhocko@...e.com,
        mgorman@...hsingularity.net, dave@...olabs.net,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/5] locking Introduce range reader/writer lock

Hi,

Here's a very tardy proposal for enhancements to Jan's original[1] range lock
using interval trees. Because at some point it would be awesome to switch mmap_sem
from rwsem to range rwlock, I've focused on making it sharable and performance
enhancements reducing the performance delta between this and conventional locks as
much as possible -- details in patch 1.

The rest of the patches adds support for testing the new lock and actually
makes use of it for lustre. It has passed quite a bit of artificial pounding and
I believe/hope it is in shape to consider.

Applies on top of v4.11-rc1.

[1] https://lkml.org/lkml/2013/1/31/483

Thanks!

Davidlohr Bueso (5):
  locking: Introduce range reader/writer lock
  locking/locktorture: Fix rwsem reader_delay
  locking/locktorture: Fix num reader/writer corner cases
  locking/locktorture: Support range rwlocks
  staging/lustre: Use generic range rwlock

 drivers/gpu/drm/Kconfig                            |   2 -
 drivers/gpu/drm/i915/Kconfig                       |   1 -
 drivers/staging/lustre/lustre/llite/Makefile       |   2 +-
 drivers/staging/lustre/lustre/llite/file.c         |  21 +-
 .../staging/lustre/lustre/llite/llite_internal.h   |   4 +-
 drivers/staging/lustre/lustre/llite/llite_lib.c    |   3 +-
 drivers/staging/lustre/lustre/llite/range_lock.c   | 239 -----------
 drivers/staging/lustre/lustre/llite/range_lock.h   |  82 ----
 include/linux/range_rwlock.h                       |  96 +++++
 kernel/locking/Makefile                            |   2 +-
 kernel/locking/locktorture.c                       | 299 +++++++++----
 kernel/locking/range_rwlock.c                      | 462 +++++++++++++++++++++
 lib/Kconfig                                        |  14 -
 lib/Kconfig.debug                                  |   1 -
 lib/Makefile                                       |   2 +-
 15 files changed, 792 insertions(+), 438 deletions(-)
 delete mode 100644 drivers/staging/lustre/lustre/llite/range_lock.c
 delete mode 100644 drivers/staging/lustre/lustre/llite/range_lock.h
 create mode 100644 include/linux/range_rwlock.h
 create mode 100644 kernel/locking/range_rwlock.c

-- 
2.6.6