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Re: [RFC 0/4] Replace mmap_sem by a range lock

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On 20/04/2017 15:33, Matthew Wilcox wrote:
> On Wed, Apr 19, 2017 at 02:18:23PM +0200, Laurent Dufour wrote:
>> Following the series pushed by Davidlohr Bueso based on the Jan Kara's
>> work [1] which introduces range locks, this series implements the
>> first step of the attempt to replace the mmap_sem by a range lock.
> 
> Have you previously documented attempts to replace the mmap_sem by an
> existing lock type before introducing a new (and frankly weird) lock?

No :/

> My initial question is "Why not use RCU for this?" -- the rxrpc code
> uses an rbtree protected by RCU.

I'm also working on forward-porting work done by Peter Zijlstra :

https://marc.info/?l=linux-mm&m=141384492326748

I'll send a series on top 4.10 soon.

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Thread

[RFC 0/4] Replace mmap_sem by a range lock Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-04-19 14:20 +0200
  Re: [RFC 0/4] Replace mmap_sem by a range lock Matthew Wilcox <willy@infradead.org> - 2017-04-20 15:40 +0200
    Re: [RFC 0/4] Replace mmap_sem by a range lock Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-04-20 16:40 +0200
  Re: [RFC 4/4] Change mmap_sem to range lock Peter Zijlstra <peterz@infradead.org> - 2017-04-20 16:40 +0200
    Re: [RFC 4/4] Change mmap_sem to range lock Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-04-20 16:50 +0200
  Re: [RFC 4/4] Change mmap_sem to range lock Andi Kleen <andi@firstfloor.org> - 2017-04-21 01:40 +0200
    Re: [RFC 4/4] Change mmap_sem to range lock Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-04-24 17:50 +0200

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