linux-kernel - Re: [PATCH v3 00/20] Speculative page faults

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Message-Id: <670c9a22-cf5b-3fab-b2f2-a72fbd4451c8@linux.vnet.ibm.com>
Date:   Wed, 4 Oct 2017 08:50:49 +0200
From:   Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kirill@...temov.name, Andi Kleen <ak@...ux.intel.com>,
        Michal Hocko <mhocko@...nel.org>, dave@...olabs.net,
        Jan Kara <jack@...e.cz>, Matthew Wilcox <willy@...radead.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Will Deacon <will.deacon@....com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, haren@...ux.vnet.ibm.com,
        Anshuman Khandual <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" <x86@...nel.org>
Subject: Re: [PATCH v3 00/20] Speculative page faults

On 25/09/2017 18:27, Alexei Starovoitov wrote:
> On Mon, Sep 18, 2017 at 12:15 AM, Laurent Dufour
> <ldufour@...ux.vnet.ibm.com> wrote:
>> Despite the unprovable lockdep warning raised by Sergey, I didn't get any
>> feedback on this series.
>>
>> Is there a chance to get it moved upstream ?
> 
> what is the status ?
> We're eagerly looking forward for this set to land,
> since we have several use cases for tracing that
> will build on top of this set as discussed at Plumbers.

Hi Alexei,

Based on Plumber's note [1], it sounds that the use case is tied to the BPF
tracing where a call tp find_vma() call will be made on a process's context
to fetch user space's symbols.

Am I right ?
Is the find_vma() call made in the context of the process owning the mm
struct ?

Thanks,
Laurent.

[1] https://etherpad.openstack.org/p/LPC2017_Tracing)