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Date:   Wed, 8 Aug 2018 12:59:21 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Thomas-Mich Richter <tmricht@...ux.ibm.com>
Cc:     mpe@...erman.id.au, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, brueckner@...ux.vnet.ibm.com,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com
Subject: Re: [PATCH 2/3] perf report: Add raw report support for s390
 auxiliary trace

Em Wed, Aug 08, 2018 at 12:53:28PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Aug 08, 2018 at 08:39:58AM +0200, Thomas-Mich Richter escreveu:
> > On 08/08/2018 05:37 AM, mpe@...erman.id.au wrote:
> > > Thomas Richter <tmricht@...ux.ibm.com> writes:
> > >> Add support for s390 auxiliary trace support.
> > >> Use 'perf record -e rbd000' to create the perf.data file.
> > >> The event also has the symbolic name SF_CYCLES_BASIC_DIAG,
> > >> using 'perf record -e SF_CYCLES_BASIC_DIAG' is equivalent.
> > > ...
> > >>
> > >> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
> > >> Reviewed-by: Hendrik Brueckner <brueckner@...ux.ibm.com>
> > >> ---
> > >>  tools/perf/util/s390-cpumsf-kernel.h |  71 ++++++++
> > >>  tools/perf/util/s390-cpumsf.c        | 244 ++++++++++++++++++++++++++-
> > >>  2 files changed, 314 insertions(+), 1 deletion(-)
> > >>  create mode 100644 tools/perf/util/s390-cpumsf-kernel.h
> > > 
> > > 
> > > I'm seeing a build break on ppc64le which seems to be caused by this
> > > commit (I haven't bisected):
> > > 
> > >   util/s390-cpumsf.c: In function ‘trailer_timestamp’:
> > >   util/s390-cpumsf.c:222:2: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
> > >     return *((unsigned long long *) &te->timestamp[te->t]);
> > >     ^
> > > 
> > > 
> > > And on powerpc big endian:
> > >   In file included from util/cpumap.h:10:0,
> > >                    from util/s390-cpumsf.c:150:
> > >   util/s390-cpumsf.c: In function ‘s390_cpumsf_basic_show’:
> > >   util/s390-cpumsf.c:187:10: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘size_t {aka unsigned int}’ [-Werror=format=]
> > >      pr_err("Invalid AUX trace basic entry [%#08lx]\n", pos);
> > >             ^
> > > 
> > > cheers
> > > 
> > 
> > Can you please try this patch. Thanks a lot
> 
> Ok, this was making the build fail as well on some containers here:

Ok, failed in another container:

  11 centos:6                      : gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-18)

  CC       /tmp/build/perf/tests/sample-parsing.o
cc1: warnings being treated as errors
In file included from util/s390-cpumsf.c:161:
util/s390-cpumsf-kernel.h:16: error: packed attribute is unnecessary for 'def'
util/s390-cpumsf-kernel.h:25: error: packed attribute is unnecessary for 'CL'
util/s390-cpumsf-kernel.h:28: error: packed attribute is unnecessary for 'ia'
util/s390-cpumsf-kernel.h:29: error: packed attribute is unnecessary for 'gpp'
util/s390-cpumsf-kernel.h:30: error: packed attribute is unnecessary for 'hpp'
util/s390-cpumsf-kernel.h:34: error: packed attribute is unnecessary for 'def'
mv: cannot stat `/tmp/build/perf/util/.s390-cpumsf.o.tmp': No such file or directory
make[4]: *** [/tmp/build/perf/util/s390-cpumsf.o] Error 1


For reference, this is the current output of the tests so far, that I'll
let running while I try to figure out this case:

[root@...enth ~]# time dm
   1    37.95 alpine:3.4                    : Ok   gcc (Alpine 5.3.0) 5.3.0
   2    48.46 alpine:3.5                    : Ok   gcc (Alpine 6.2.1) 6.2.1 20160822
   3    43.18 alpine:3.6                    : Ok   gcc (Alpine 6.3.0) 6.3.0
   4    46.87 alpine:3.7                    : Ok   gcc (Alpine 6.4.0) 6.4.0
   5    85.35 alpine:edge                   : Ok   gcc (Alpine 6.4.0) 6.4.0
   6    36.86 amazonlinux:1                 : Ok   gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28)
   7    41.37 amazonlinux:2                 : Ok   gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)
   8    30.61 android-ndk:r12b-arm          : Ok   arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
   9    27.69 android-ndk:r15c-arm          : Ok   arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
  10    26.45 centos:5                      : Ok   gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-55)
  11    20.70 centos:6                      : FAIL gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23)
  12    39.16 centos:7                      : Ok   gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28)
  13    34.18 debian:7                      : Ok   gcc (Debian 4.7.2-5) 4.7.2
  14    37.12 debian:8                      : Ok   gcc (Debian 4.9.2-10+deb8u1) 4.9.2
  15: debian:9

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