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From: Stephane Eranian <eranian@google.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexey Budankov <alexey.budankov@linux.intel.com>,
	Jiri Olsa <jolsa@kernel.org>, lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Andi Kleen <ak@linux.intel.com>
Subject: Re: [RFC/PATCH 00/14] perf record: Add support to store data in directory
Date: Mon, 11 Feb 2019 12:43:22 -0800	[thread overview]
Message-ID: <CABPqkBRdmfOde793id4GEuwD=eYL8TLKe1p8k07xWAh1MPD3AQ@mail.gmail.com> (raw)
In-Reply-To: <20190211201831.GE5046@krava>

On Mon, Feb 11, 2019 at 12:18 PM Jiri Olsa <jolsa@redhat.com> wrote:
>
> On Mon, Feb 11, 2019 at 04:32:02PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Mon, Feb 11, 2019 at 07:53:06PM +0100, Jiri Olsa escreveu:
> > > On Mon, Feb 11, 2019 at 10:34:16AM -0800, Stephane Eranian wrote:
> > > > On Mon, Feb 11, 2019 at 2:20 AM Jiri Olsa <jolsa@redhat.com> wrote:
> > > > > On Tue, Feb 05, 2019 at 02:37:27PM +0100, Jiri Olsa wrote:
> > > > > I think all could be added and worked around with exception
> > > > > of BUILD_ID, which we store at the end (after processing
> > > > > all data) and we need it early in the report phase
> >
> > > > Buildids are injected after the fact via perf inject when in pipe mode.
> >
> > > > > maybe it's time to re-think that buildid -> mmap event
> > > > > association again, because it's pain in current implementation
> > > > > as well
> >
> > > > Sure, but what do you propose?
> >
> > > this:
> > >
> > > > > looks like bpf code is actualy getting build ids and storing
> > > > > it for the callchains in kernel.. we can check if we can do
> > > > > something similar for mmap events
> >
> > kernel/bpf/stackmap.c
> >
> > /* Parse build ID from 64-bit ELF */
> > static int stack_map_get_build_id_64(void *page_addr,
> >                                      unsigned char *build_id)
> >
> > yeah, wasn't aware of that, good thing doing backports, huh? :-)
> >
> > So do you thing about having a PERF_SAMPLE_BUILDID in sample_type and go
> > and stash that thing in PERF_RECORD_MMAP2?
>
That would be special processing. Normally the sample_type go into
each RECORD_SAMPLE.
So I would not recommend this approach.

> I thought having new MMAP3 event version with buildid field in it
> if available and/or enabled by bit in perf_event_attr
>
I think MMAP3 is a cleaner approach, though it adds yet another MMAP event.

> jirka

  reply	other threads:[~2019-02-11 20:43 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-03 15:30 [RFC/PATCH 00/14] perf record: Add support to store data in directory Jiri Olsa
2019-02-03 15:30 ` [PATCH 01/14] perf tools: Make rm_rf to remove single file Jiri Olsa
2019-02-05 11:33   ` Alexey Budankov
2019-02-05 13:38     ` Jiri Olsa
2019-02-03 15:30 ` [PATCH 02/14] perf session: Add process callback to reader object Jiri Olsa
2019-02-03 15:30 ` [PATCH 03/14] perf data: Move size to struct perf_data_file Jiri Olsa
2019-02-03 15:30 ` [PATCH 04/14] perf data: Add global path holder Jiri Olsa
2019-02-03 15:30 ` [PATCH 05/14] perf data: Make check_backup work over directories Jiri Olsa
2019-02-03 15:30 ` [PATCH 06/14] perf data: Add perf_data__(create_dir|free_dir) functions Jiri Olsa
2019-02-05 11:52   ` Alexey Budankov
2019-02-05 13:42     ` Jiri Olsa
2019-02-05 13:46   ` Arnaldo Carvalho de Melo
2019-02-05 13:53     ` Jiri Olsa
2019-02-03 15:30 ` [PATCH 07/14] perf data: Add perf_data__open_dir_data function Jiri Olsa
2019-02-03 15:30 ` [PATCH 08/14] perf data: Add directory support Jiri Olsa
2019-02-03 15:30 ` [PATCH 09/14] perf data: Don't store auxtrace index for directory data file Jiri Olsa
2019-02-03 15:30 ` [PATCH 10/14] perf data: Add perf_data__update_dir function Jiri Olsa
2019-02-03 15:30 ` [PATCH 11/14] perf data: Make perf_data__size to work over directory Jiri Olsa
2019-02-03 15:30 ` [PATCH 12/14] perf session: Add __perf_session__process_dir_events function Jiri Olsa
2019-02-03 15:30 ` [PATCH 13/14] perf session: Add path to reader object Jiri Olsa
2019-02-03 15:30 ` [PATCH 14/14] perf record: Add --dir option to store data in directory Jiri Olsa
2019-02-05 12:36   ` Alexey Budankov
2019-02-05 13:51     ` Jiri Olsa
2019-02-04 10:12 ` [RFC/PATCH 00/14] perf record: Add support " Alexey Budankov
2019-02-04 10:36   ` Jiri Olsa
2019-02-04 11:29     ` Alexey Budankov
2019-02-04 11:41       ` Jiri Olsa
2019-02-04 18:56         ` Stephane Eranian
2019-02-04 19:27           ` Arnaldo Carvalho de Melo
2019-02-04 19:56             ` Alexey Budankov
2019-02-04 20:05             ` Stephane Eranian
2019-02-04 20:28               ` Jiri Olsa
2019-02-04 22:44                 ` Stephane Eranian
2019-02-05 13:37                   ` Jiri Olsa
2019-02-11 10:19                     ` Jiri Olsa
2019-02-11 18:34                       ` Stephane Eranian
2019-02-11 18:53                         ` Jiri Olsa
2019-02-11 19:32                           ` Arnaldo Carvalho de Melo
2019-02-11 20:18                             ` Jiri Olsa
2019-02-11 20:43                               ` Stephane Eranian [this message]
2019-02-14 11:34                                 ` Jiri Olsa
2019-02-14 12:57                                   ` Arnaldo Carvalho de Melo
2019-02-14 13:26                                     ` Jiri Olsa
2019-02-14 13:59                                       ` Arnaldo Carvalho de Melo
2019-02-14 21:30                                         ` Stephane Eranian
     [not found]                                           ` <CA+JHD90ssKi3CJ7yfCFTkrS8xwUsZhvd0t7cSCy1MF7TJ2XLYw@mail.gmail.com>
2019-02-14 21:39                                             ` Stephane Eranian
2019-02-11 18:55                         ` Arnaldo Carvalho de Melo
2019-02-11 19:30                           ` Stephane Eranian
2019-02-11 20:30                             ` Song Liu

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