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SubjectRe: [PATCH 5/7] perf session: don't rely on evlist in pipe mode
Em Tue, Apr 11, 2017 at 03:40:14PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Apr 10, 2017 at 01:14:30PM -0700, David Carrillo-Cisneros escreveu:
> > Session sets a number parameters that rely on evlist. These parameters
> > are not used in pipe-mode and should not be set, since evlist is
> > unavailable. Fix that.
>
> Ditching this one as well, until further investigation, well, file must
> be null in this case...

Ah, this is the problem:

[root@jouet ~]# perf top
perf: Segmentation fault
-------- backtrace --------
perf[0x57eddb]
/lib64/libc.so.6(+0x35990)[0x7fb435d06990]
perf(perf_session__new+0xb7)[0x4eb547]
perf(cmd_top+0xde9)[0x44ce89]
perf[0x49953f]
perf[0x499831]
perf(main+0x252)[0x428dd2]
/lib64/libc.so.6(__libc_start_main+0xf1)[0x7fb435cf1401]
perf(_start+0x2a)[0x4292da]
[0x0]
[root@jouet ~]#

> [acme@jouet linux]$ git bisect bad
> 5d71c27204d51492abe9fc69064fd36a0bda410b is the first bad commit
> commit 5d71c27204d51492abe9fc69064fd36a0bda410b
> Author: David Carrillo-Cisneros <davidcc@google.com>
> Date: Mon Apr 10 13:14:30 2017 -0700
>
> perf session: Don't rely on evlist in pipe mode
>
> Session sets a number parameters that rely on evlist. These parameters
> are not used in pipe-mode and should not be set, since evlist is
> unavailable. Fix that.
>
> Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
> Acked-by: Jiri Olsa <jolsa@kernel.org>
> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
> Cc: Andi Kleen <ak@linux.intel.com>
> Cc: He Kuang <hekuang@huawei.com>
> Cc: Masami Hiramatsu <mhiramat@kernel.org>
> Cc: Paul Turner <pjt@google.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Simon Que <sque@chromium.org>
> Cc: Stephane Eranian <eranian@google.com>
> Cc: Wang Nan <wangnan0@huawei.com>
> Link: http://lkml.kernel.org/r/20170410201432.24807-6-davidcc@google.com
> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
>
> :040000 040000 7df28fe9d7c9d962b78c0532f4961caea2737b59 34e4fed0042b1401c1a1a247d8ae40df17f9d272 M tools
> [acme@jouet linux]$
>
> > Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
> > ---
> > tools/perf/util/session.c | 16 +++++++++++++---
> > 1 file changed, 13 insertions(+), 3 deletions(-)
> >
> > diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> > index a25302bc55a8..db554b7461b8 100644
> > --- a/tools/perf/util/session.c
> > +++ b/tools/perf/util/session.c
> > @@ -140,8 +140,14 @@ struct perf_session *perf_session__new(struct perf_data_file *file,
> > if (perf_session__open(session) < 0)
> > goto out_close;
> >
> > - perf_session__set_id_hdr_size(session);
> > - perf_session__set_comm_exec(session);
> > + /*
> > + * set session attributes that are present in perf.data
> > + * but not in pipe-mode.
> > + */
> > + if (!file->is_pipe) {
> > + perf_session__set_id_hdr_size(session);
> > + perf_session__set_comm_exec(session);
> > + }
> > }
> > } else {
> > session->machines.host.env = &perf_env;
> > @@ -156,7 +162,11 @@ struct perf_session *perf_session__new(struct perf_data_file *file,
> > pr_warning("Cannot read kernel map\n");
> > }
> >
> > - if (tool && tool->ordering_requires_timestamps &&
> > + /*
> > + * In pipe-mode, evlist is empty until PERF_RECORD_HEADER_ATTR is
> > + * processed, so perf_evlist__sample_id_all is not meaningful here.
> > + */
> > + if (!file->is_pipe && tool && tool->ordering_requires_timestamps &&
> > tool->ordered_events && !perf_evlist__sample_id_all(session->evlist)) {
> > dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
> > tool->ordered_events = false;
> > --
> > 2.12.2.715.g7642488e1d-goog

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