linux-kernel - Re: [PATCH 3/3] perf tools: Make 'struct map

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Date:   Mon, 14 Oct 2019 12:46:19 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>
Subject: Re: [PATCH 3/3] perf tools: Make 'struct map_shared' truly shared

> > We may need a COW operation for this (hopefully rare) case.
> 
> so the jitted mmaps are inserted into the data file
> and processed during report where they can overload
> existing maps - thats detected before addition in:
> 
>   thread__insert_map
>     map_groups__fixup_overlappings
>       - which uses COW way -> map__clone(map, false);
>         to create new map
> 
> other fixups to maps are being done only for kernel maps,
> where we dont have a problem, because there's only one copy

I assume the same is true for /tmp/perf-* processing?

Thanks for looking into it.



-Andi