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Re: [RFC 00/13] perf_env/CPU socket reorg/fixes

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Em Thu, Sep 10, 2015 at 11:19:06AM +0200, Jiri Olsa escreveu:
> On Wed, Sep 09, 2015 at 04:50:12PM -0300, Arnaldo Carvalho de Melo wrote:
> > 	Please take a look at these changes to fix the problems reported by
> > Wang Nan wrt accesses to the cpu_topology_map information.
> > 
> > 	The fixes are present on these following two csets:
> > 
> >   perf event: Use machine->env to find the cpu -> socket mapping
> >   perf report: Do not blindly use env->cpu[al.cpu].socket_id
> > 
> > 	The rest are fixes made while working on this, infrastructure to enable
> > the fixes, reverts for things that ended up not being necessary and some
> > cleanups.
> > 
> > 	It is available at:
> > 
> >  git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/env
> > 
> > 	Please let me know if I can have your Acked-by, Tested-by or
> > Reviewed-by.
> 
> perf_env holds the data for perf.data session.. is the plan to keep

No, perf_env holds the data for the environment where samples were
taken.

It is needed to generate a perf.data file, and also now is needed to map
cpu -> socket_id, be it in a live session, where no perf.data file, nor
perf_session stuff is used (perf trace, I keep meaning to do the 'perf
top' conversion away from perf_session, others in the future).

I.e. perf_event__preprocess_sample() doesn't have to know if the samples
were freshly taken or if they come from another machine, possibly of a
different architecture.

> it like this, or it's to be used in some other way? Moving it out of
> session/header real suggest that.. just asking ;-)

They are already used in another way, i.e. we need to have that mapping
of cpu -> socket_id, to stop reading /sys/ to figure that out. I.e.
perf_env is, among other sampling/tracing environment, a cache of that
info, taken at perf.data generation time or at tool start time, if that
info is needed (i.e. if we use "socket" in -s).

- Arnaldo
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[RFC 00/13] perf_env/CPU socket reorg/fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
  [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
    RE: [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method "Liang, Kan" <kan.liang@intel.com> - 2015-09-09 23:50 +0200
      Re: [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-10 15:20 +0200
        RE: [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method "Liang, Kan" <kan.liang@intel.com> - 2015-09-10 22:10 +0200
          RE: [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method "Liang, Kan" <kan.liang@intel.com> - 2015-09-10 22:20 +0200
          Re: [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-10 22:20 +0200
        Re: [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method "Wangnan (F)" <wangnan0@huawei.com> - 2015-09-11 12:30 +0200
          Re: [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-11 16:50 +0200
            Re: [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-11 17:40 +0200
              Re: [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method Namhyung Kim <namhyung@kernel.org> - 2015-09-11 18:20 +0200
                Re: [PATCH 04/13] perf env: Introduce read_cpu_topology_map() method Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-11 18:40 +0200
              [tip:perf/urgent] perf header:   Fixup reading of HEADER_NRCPUS feature tip-bot for Arnaldo Carvalho de Melo <tipbot@zytor.com> - 2015-09-14 11:20 +0200
    [tip:perf/core] perf env: Introduce read_cpu_topology_map()   method tip-bot for Arnaldo Carvalho de Melo <tipbot@zytor.com> - 2015-09-15 09:10 +0200
  [PATCH 07/13] perf hists browser: Fixup the "cpu" column width calculation Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
    Re: [PATCH 07/13] perf hists browser: Fixup the "cpu" column width  calculation "Wangnan (F)" <wangnan0@huawei.com> - 2015-09-11 13:00 +0200
  [PATCH 12/13] perf evsel: Remove forward declaration of 'struct perf_evlist' Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
  [PATCH 02/13] perf env: Rename some leftovers from rename to perf_env Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
  [PATCH 01/13] perf env: Move perf_env out of header.h and session.c into separate object Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
  [PATCH 13/13] Revert "perf evlist: Add backpointer for perf_env to evlist" Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
  [PATCH 08/13] perf machine: Add pointer to sample's environment Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
  [PATCH 06/13] perf top: Cache the cpu topology info when "-s socket" is used Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
  [PATCH 03/13] perf env: Adopt perf_header__set_cmdline Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
  [PATCH 09/13] perf event: Use machine->env to find the cpu -> socket mapping Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
  [PATCH 10/13] perf report: Do not blindly use env->cpu[al.cpu].socket_id Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-09 22:00 +0200
    Re: [PATCH 10/13] perf report: Do not blindly use env->cpu[al.cpu].socket_id "Wangnan (F)" <wangnan0@huawei.com> - 2015-09-11 14:00 +0200
  Re: [RFC 00/13] perf_env/CPU socket reorg/fixes Jiri Olsa <jolsa@redhat.com> - 2015-09-10 11:20 +0200
    Re: [RFC 00/13] perf_env/CPU socket reorg/fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-10 16:20 +0200
  Re: [RFC 00/13] perf_env/CPU socket reorg/fixes "Wangnan (F)" <wangnan0@huawei.com> - 2015-09-11 14:30 +0200
    Re: [RFC 00/13] perf_env/CPU socket reorg/fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-11 15:10 +0200
      Re: [RFC 00/13] perf_env/CPU socket reorg/fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-11 15:30 +0200
        Re: [RFC 00/13] perf_env/CPU socket reorg/fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-11 15:40 +0200
          Re: [RFC 00/13] perf_env/CPU socket reorg/fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-09-11 15:40 +0200
            Re: [RFC 00/13] perf_env/CPU socket reorg/fixes "Wangnan (F)" <wangnan0@huawei.com> - 2015-09-14 03:40 +0200
      Re: [RFC 00/13] perf_env/CPU socket reorg/fixes "Wangnan (F)" <wangnan0@huawei.com> - 2015-09-14 03:30 +0200

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