Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) client-ip=2620:137:e000::3:3;
From:   Andi Kleen <ak@linux.intel.com>
To:     Namhyung Kim <namhyung@kernel.org>
Cc:     Arnaldo Carvalho de Melo <acme@kernel.org>,
        Jiri Olsa <jolsa@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ian Rogers <irogers@google.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Ingo Molnar <mingo@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        linux-perf-users@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Stephane Eranian <eranian@google.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        linux-toolchains@vger.kernel.org,
        linux-trace-devel@vger.kernel.org,
        Ben Woodard <woodard@redhat.com>,
        Joe Mario <jmario@redhat.com>,
        Kees Cook <keescook@chromium.org>,
        David Blaikie <blaikie@google.com>,
        Xu Liu <xliuprof@google.com>,
        Kan Liang <kan.liang@linux.intel.com>,
        Ravi Bangoria <ravi.bangoria@amd.com>
Subject: Re: [RFC 00/48] perf tools: Introduce data type profiling (v1)
References: <20231012035111.676789-1-namhyung@kernel.org>
Date:   Mon, 23 Oct 2023 14:58:08 -0700
In-Reply-To: <20231012035111.676789-1-namhyung@kernel.org> (Namhyung Kim's
        message of "Wed, 11 Oct 2023 20:50:23 -0700")
Message-ID: <87pm15vw5r.fsf@linux.intel.com>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.3 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Namhyung Kim <namhyung@kernel.org> writes:

> Hello,
>
> I'm happy to share my work on data type profiling.  This is to associate
> PMU samples to data types they refer using DWARF debug information.  So
> basically it depends on quality of PMU events and compiler for producing
> DWARF info.  But it doesn't require any changes in the target program.
>
> As it's an early stage, I've targeted the kernel on x86 to reduce the
> amount of work but IIUC there's no fundamental blocker to apply it to
> other architectures and applications.

FWIW i posted a similar patchkit a long time ago

https://lore.kernel.org/lkml/20171128002321.2878-13-andi@firstfloor.org/

It was on my list to resurrect that, it's great that you are doing
something similar.

The latest iteration (not posted) was here:

https://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git/log/?h=perf/var-resolve-7

The main difference seems to be that mine was more for perf script
(e.g. i supported PT decoding), while you are more focused on sampling.
I relied on the kprobes/uprobes engine, which unfortunately was always
quite slow and had many limitations.

Perhaps it would be possible merge the useful parts of the two approaches?

-Andi