linux-kernel - Re: [PATCH 0/5] mm: i_mmap

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Date:	Thu, 29 May 2014 19:20:15 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	akpm@...ux-foundation.org
Cc:	mingo@...nel.org, peterz@...radead.org, riel@...hat.com,
	mgorman@...e.de, aswin@...com, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] mm: i_mmap_mutex to rwsem

ping? Andrew any chance of getting this in -next?

On Thu, 2014-05-22 at 20:33 -0700, Davidlohr Bueso wrote:
> This patchset extends the work started by Ingo Molnar in late 2012,
> optimizing the anon-vma mutex lock, converting it from a exclusive mutex
> to a rwsem, and sharing the lock for read-only paths when walking the
> the vma-interval tree. More specifically commits 5a505085 and 4fc3f1d6.
> 
> The i_mmap_mutex has similar responsibilities with the anon-vma, protecting
> file backed pages. Therefore we can use similar locking techniques: covert
> the mutex to a rwsem and share the lock when possible.
> 
> With the new optimistic spinning property we have in rwsems, we no longer
> take a hit in performance when using this lock, and we can therefore
> safely do the conversion. Tests show no throughput regressions in aim7 or
> pgbench runs, and we can see gains from sharing the lock, in disk workloads
> ~+15% for over 1000 users on a 8-socket Westmere system.
> 
> This patchset applies on linux-next-20140522.
> 
> Thanks!
> 
> Davidlohr Bueso (5):
>   mm,fs: introduce helpers around i_mmap_mutex
>   mm: use new helper functions around the i_mmap_mutex
>   mm: convert i_mmap_mutex to rwsem
>   mm/rmap: share the i_mmap_rwsem
>   mm: rename leftover i_mmap_mutex
> 
>  fs/hugetlbfs/inode.c         | 14 +++++++-------
>  fs/inode.c                   |  2 +-
>  include/linux/fs.h           | 23 ++++++++++++++++++++++-
>  include/linux/mmu_notifier.h |  2 +-
>  kernel/events/uprobes.c      |  6 +++---
>  kernel/fork.c                |  4 ++--
>  mm/filemap.c                 | 10 +++++-----
>  mm/filemap_xip.c             |  4 ++--
>  mm/hugetlb.c                 | 22 +++++++++++-----------
>  mm/memory-failure.c          |  4 ++--
>  mm/memory.c                  |  8 ++++----
>  mm/mmap.c                    | 22 +++++++++++-----------
>  mm/mremap.c                  |  6 +++---
>  mm/nommu.c                   | 14 +++++++-------
>  mm/rmap.c                    | 10 +++++-----
>  15 files changed, 86 insertions(+), 65 deletions(-)
> 


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