Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Mon, 14 Sep 2020 12:13:10 -0300
From:   Arnaldo Carvalho de Melo <acme@kernel.org>
To:     Namhyung Kim <namhyung@kernel.org>
Cc:     Jiri Olsa <jolsa@kernel.org>, Alexei Starovoitov <ast@kernel.org>,
        lkml <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Ingo Molnar <mingo@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Michael Petlan <mpetlan@redhat.com>,
        Song Liu <songliubraving@fb.com>,
        "Frank Ch. Eigler" <fche@redhat.com>,
        Ian Rogers <irogers@google.com>,
        Stephane Eranian <eranian@google.com>,
        Alexey Budankov <alexey.budankov@linux.intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Adrian Hunter <adrian.hunter@intel.com>
Subject: Re: [RFC 00/26] perf: Add mmap3 support
Message-ID: <20200914151310.GA160517@kernel.org>
References: <20200913210313.1985612-1-jolsa@kernel.org>
 <CAM9d7ci4VUuAguynK76Zd7YSnNoAErsgabucUjb3qcuXj5m7Pg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAM9d7ci4VUuAguynK76Zd7YSnNoAErsgabucUjb3qcuXj5m7Pg@mail.gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Em Mon, Sep 14, 2020 at 02:25:25PM +0900, Namhyung Kim escreveu:
> On Mon, Sep 14, 2020 at 6:03 AM Jiri Olsa <jolsa@kernel.org> wrote:
> > while playing with perf daemon support I realized I need
> > the build id data in mmap events, so we don't need to care
> > about removed/updated binaries during long perf runs.

> > This RFC patchset adds new mmap3 events that copies mmap2
> > event and adds build id in it. It makes mmap3 the default
> > mmap event for synthesizing kernel/modules/tasks and adds
> > some tooling enhancements to enable the workflow below.

> Cool! It's nice that we can skip the final build-id collection stage
> with this while data size will be bigger.

Yeah, this is something long overdue, comes with extra cost for people
not wanting build-ids, but then they can just use MMAP2 or even MMAP if
that is enough.

More comments on the other patches.

- Arnaldo