Re: [PATCH v12 21/31] mm: Introduce find_vma_rcu()

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To: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Subject: Re: [PATCH v12 21/31] mm: Introduce find_vma_rcu()
From: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Date: Tue, 23 Apr 2019 11:13:15 -0700
Cc: Laurent Dufour <ldufour@xxxxxxxxxxxxx>, akpm@xxxxxxxxxxxxxxxxxxxx, mhocko@xxxxxxxxxx, kirill@xxxxxxxxxxxxx, ak@xxxxxxxxxxxxxxx, jack@xxxxxxx, Matthew Wilcox <willy@xxxxxxxxxxxxx>, aneesh.kumar@xxxxxxxxxxxxx, benh@xxxxxxxxxxxxxxxxxxx, mpe@xxxxxxxxxxxxxx, paulus@xxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, hpa@xxxxxxxxx, Will Deacon <will.deacon@xxxxxxx>, Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>, sergey.senozhatsky.work@xxxxxxxxx, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>, kemi.wang@xxxxxxxxx, Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Jerome Glisse <jglisse@xxxxxxxxxx>, Ganesh Mahendran <opensource.ganesh@xxxxxxxxx>, Minchan Kim <minchan@xxxxxxxxxx>, Punit Agrawal <punitagrawal@xxxxxxxxx>, vinayak menon <vinayakm.list@xxxxxxxxx>, Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>, zhong jiang <zhongjiang@xxxxxxxxxx>, Haiyan Song <haiyanx.song@xxxxxxxxx>, Balbir Singh <bsingharora@xxxxxxxxx>, sj38.park@xxxxxxxxx, Michel Lespinasse <walken@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, haren@xxxxxxxxxxxxxxxxxx, npiggin@xxxxxxxxx, paulmck@xxxxxxxxxxxxxxxxxx, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>, linuxppc-dev@xxxxxxxxxxxxxxxx, x86@xxxxxxxxxx
In-reply-to: <20190423092710.GI11158@hirez.programming.kicks-ass.net>
Mail-followup-to: Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Laurent Dufour <ldufour@xxxxxxxxxxxxx>, akpm@xxxxxxxxxxxxxxxxxxxx, mhocko@xxxxxxxxxx, kirill@xxxxxxxxxxxxx, ak@xxxxxxxxxxxxxxx, jack@xxxxxxx, Matthew Wilcox <willy@xxxxxxxxxxxxx>, aneesh.kumar@xxxxxxxxxxxxx, benh@xxxxxxxxxxxxxxxxxxx, mpe@xxxxxxxxxxxxxx, paulus@xxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, hpa@xxxxxxxxx, Will Deacon <will.deacon@xxxxxxx>, Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>, sergey.senozhatsky.work@xxxxxxxxx, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>, kemi.wang@xxxxxxxxx, Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Jerome Glisse <jglisse@xxxxxxxxxx>, Ganesh Mahendran <opensource.ganesh@xxxxxxxxx>, Minchan Kim <minchan@xxxxxxxxxx>, Punit Agrawal <punitagrawal@xxxxxxxxx>, vinayak menon <vinayakm.list@xxxxxxxxx>, Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>, zhong jiang <zhongjiang@xxxxxxxxxx>, Haiyan Song <haiyanx.song@xxxxxxxxx>, Balbir Singh <bsingharora@xxxxxxxxx>, sj38.park@xxxxxxxxx, Michel Lespinasse <walken@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, haren@xxxxxxxxxxxxxxxxxx, npiggin@xxxxxxxxx, paulmck@xxxxxxxxxxxxxxxxxx, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>, linuxppc-dev@xxxxxxxxxxxxxxxx, x86@xxxxxxxxxx
References: <20190416134522.17540-1-ldufour@linux.ibm.com> <20190416134522.17540-22-ldufour@linux.ibm.com> <20190423092710.GI11158@hirez.programming.kicks-ass.net>
User-agent: NeoMutt/20180323

On Tue, 23 Apr 2019, Peter Zijlstra wrote:

Also; the initial motivation was prefaulting large VMAs and the
contention on mmap was killing things; but similarly, the contention on
the refcount (I did try that) killed things just the same.


Right, this is just like what can happen with per-vma locking.

Thanks,
Davidlohr

References:
- [PATCH v12 00/31] Speculative page faults
  - From: Laurent Dufour
- [PATCH v12 21/31] mm: Introduce find_vma_rcu()
  - From: Laurent Dufour
- Re: [PATCH v12 21/31] mm: Introduce find_vma_rcu()
  - From: Peter Zijlstra

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