linux-kernel - Re: [PATCH V2] libperf evlist: Fix per-thread mmaps for multi-threaded targets

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Message-ID: <69bf3c5b-e3e8-9099-bd7b-b05beea7bd1f@maine.edu>
Date:   Tue, 6 Sep 2022 17:17:14 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     Ian Rogers <irogers@...gle.com>
cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <olsajiri@...il.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH V2] libperf evlist: Fix per-thread mmaps for multi-threaded
 targets

On Tue, 6 Sep 2022, Ian Rogers wrote:

> > >>                              perf_evlist__set_mmap_first(evlist, map, overwrite);
> > >>              } else {
> libperf CPU map code as I'd like to propose we start a libperf2 (with
> LPC coming up it'd be a good place to discuss this, there's also the
> office hours on Thursday). What I hope for libperf2 is that we can
> make its license the same as libbpf, so the code can be more widely
> included in projects.

If you did plan to do this, it might be nice to include some 
representatives from groups that would be likely to use such a library.  
This might include the PAPI library developers, and there are various 
other tools (especially in the HPC area) who are coding to 
perf_event_open() directly but probably would like to use a library 
instead if possible.

Vince Weaver
vincent.weaver@...ne.edu