linux-kernel - Re: [PATCH 4/9] perf tools: Maintain cgroup hierarchy

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Date:   Mon, 17 Feb 2020 12:46:04 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Namhyung Kim <namhyung@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Stephane Eranian <eranian@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>
Subject: Re: [PATCH 4/9] perf tools: Maintain cgroup hierarchy

Em Tue, Jan 21, 2020 at 10:42:46AM +0100, Jiri Olsa escreveu:
> On Mon, Jan 20, 2020 at 10:57:47PM +0900, Namhyung Kim wrote:
> > So I tried this but then realized that it's hard to get the perf_env later
> > when it needs to convert a cgroup id to name (ie. in sort_entry.se_snprintf).
> > I also checked maybe I can resolve it when a hist entry is added,
> > but it doesn't have the pointer there too.
 
> looks like there might be a path for standard report where hists
> are part of evsel object:
> 
>   'struct hist_entry' via ->hists to  'struct hists'
>   hists_to_evsel(hists) to 'struct evsel'
>   'struct evsel' via ->evlist to 'struct evlist'
>   and there you have evlist->env ;-)

Hey, recently I did work that ended up adding a 'struct maps' to 'struct
map_symbol' and then hist_entry::ms has it, enough?

i.e.:

hist_entry::ms->maps->machine

  he->ms->maps->machine
 
> however I was wondering if we could add 'machine' pointer
> to the hist object, that would make that simpler ;-)

Directly from one of its hist_entries? As above?
 
> not sure about the way.. would be nice if that'd work for
> both evsel hists and standalone ones like in c2c
 
> but maybe just some init helper that sets the pointer early on
> might do the job

Sorry for the delay in answering, was travelling/vacations, now taming a
huge mailbox :-\

- Arnaldo