linux-kernel - Re: perf/jit doesn't cope well with mprotect() to jit containing pages

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Message-ID: <20170126012513.yktgxvf65p6wk6rz@alap3.anarazel.de>
Date:   Wed, 25 Jan 2017 17:25:13 -0800
From:   Andres Freund <andres@...razel.de>
To:     Stephane Eranian <eranian@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>, acme@...nel.org,
        jolsa@...hat.com, mingo@...e.hu, anton@...abs.org,
        namhyung@...nel.org, Stephane Eranian <eranian@...il.com>
Subject: Re: perf/jit doesn't cope well with mprotect() to jit containing
 pages

Hi,

On 2016-12-12 10:28:13 +0100, Peter Zijlstra wrote:
> On Mon, Dec 12, 2016 at 01:01:48AM -0800, Andres Freund wrote:
> > 
> > 
> > On December 12, 2016 12:49:03 AM PST, Peter Zijlstra <peterz@...radead.org> wrote:
> > >On Fri, Dec 09, 2016 at 09:02:18PM -0800, Andres Freund wrote:
> > 
> > >> Am I doing something wrong, or is there a bug here?
> > >
> > >Expected behaviour afaict
> > 
> > So I need to prevent vma  merging to use perf jit support? That seems
> > a bit weird. 
> 
> No idea about that, I don't really have the whole JIT stuff present atm.
> I just know how the mmap stuff works.
> 
> Stephane?

Ping?

Andres