linux-kernel - Re: [PATCH v6 00/24] Speculative page faults

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Message-ID: <20180116151145.74odvlj6mjuwq3rr@node.shutemov.name>
Date:   Tue, 16 Jan 2018 18:11:45 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Cc:     paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
        akpm@...ux-foundation.org, ak@...ux.intel.com, mhocko@...nel.org,
        dave@...olabs.net, jack@...e.cz,
        Matthew Wilcox <willy@...radead.org>, 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>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        kemi.wang@...el.com, sergey.senozhatsky.work@...il.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
        npiggin@...il.com, bsingharora@...il.com,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org
Subject: Re: [PATCH v6 00/24] Speculative page faults

On Fri, Jan 12, 2018 at 06:25:44PM +0100, Laurent Dufour wrote:
> ------------------
> Benchmarks results
> 
> Base kernel is 4.15-rc6-mmotm-2018-01-04-16-19
> SPF is BASE + this series

Do you have THP=always here? Lack of THP support worries me.

What is performance in the worst case scenario? Like when we go far enough into
speculative code path on every page fault and then fallback to normal page
fault?

-- 
 Kirill A. Shutemov