linux-kernel - Re: [PATCH v11 00/26] Speculative page faults

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Message-Id: <8dce53f8-b085-c4a7-3d87-de66bbcdc18c@liunx.vnet.ibm.com>
Date:   Mon, 5 Nov 2018 17:08:45 +0100
From:   Laurent Dufour <ldufour@...nx.vnet.ibm.com>
To:     Balbir Singh <bsingharora@...il.com>,
        Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Cc:     akpm@...ux-foundation.org, mhocko@...nel.org, peterz@...radead.org,
        kirill@...temov.name, ak@...ux.intel.com, dave@...olabs.net,
        jack@...e.cz, Matthew Wilcox <willy@...radead.org>,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        benh@...nel.crashing.org, mpe@...erman.id.au, paulus@...ba.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
        Will Deacon <will.deacon@....com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        sergey.senozhatsky.work@...il.com,
        Andrea Arcangeli <aarcange@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        kemi.wang@...el.com, Daniel Jordan <daniel.m.jordan@...cle.com>,
        David Rientjes <rientjes@...gle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Ganesh Mahendran <opensource.ganesh@...il.com>,
        Minchan Kim <minchan@...nel.org>,
        Punit Agrawal <punitagrawal@...il.com>,
        vinayak menon <vinayakm.list@...il.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, npiggin@...il.com,
        paulmck@...ux.vnet.ibm.com, Tim Chen <tim.c.chen@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org
Subject: Re: [PATCH v11 00/26] Speculative page faults

Le 05/11/2018 à 11:42, Balbir Singh a écrit :
> On Thu, May 17, 2018 at 01:06:07PM +0200, Laurent Dufour wrote:
>> This is a port on kernel 4.17 of the work done by Peter Zijlstra to handle
>> page fault without holding the mm semaphore [1].
>>
>> The idea is to try to handle user space page faults without holding the
>> mmap_sem. This should allow better concurrency for massively threaded
> 
> Question -- I presume mmap_sem (rw_semaphore implementation tested against)
> was qrwlock?

I don't think so, this series doesn't change the mmap_sem definition so 
it still belongs to the 'struct rw_semaphore'.

Laurent.