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

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Date:   Mon, 12 Dec 2016 01:01:48 -0800
From:   Andres Freund <andres@...razel.de>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>, 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

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.  Possibly the inject --jit  pass needs to do something about this? A hack might be to re-emit  the fake mmap2 records after ones potentially overwriting previously emitted records.   Don't know perf internals well enough to suggest something prettier.

Andres
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