linux-kernel - [PATCHSET 0/4] perf annotate-data: Update data-type profiling quality (v2)

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Message-ID: <20240821232628.353177-1-namhyung@kernel.org>
Date: Wed, 21 Aug 2024 16:26:24 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Kan Liang <kan.liang@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org,
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Subject: [PATCHSET 0/4] perf annotate-data: Update data-type profiling quality (v2)

Hello,

This is continuation of data type profiling series to improve its quality.
I've also found some more bugs and room for improvements.

Acutally it depends on the a couple of fixes I sent out yesterday.
But as they will be merged to perf-tools-next, I omitted them here.

There's no dramatic improvements at this moment, but I handled some
corner cases which makes instruction tracking more flexible.  One
change is when it accesses (stores) a stack slot for the first time.
As it doesn't save anything there yet, it doesn't come with a type
info.  In that case it can try to process the instruction with
update_insn_state() and get the type information again.

Another update is when compiler generates the debug info inaccurately.
A variable information is there but in some cases it was using another
register to access the data and it resulted in no type information.
So I tracked the (direct) register move and update the type info for
the source registre as well.

The code is available at 'perf/data-profile-update-v2' branch in 

git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git

Thanks,
Namhyung

Namhyung Kim (4):
  perf dwarf-aux: Handle bitfield members from pointer access
  perf annotate-data: Update debug messages
  perf annotate-data: Update stack slot for the store
  perf annotate-data: Copy back variable types after move

 tools/perf/arch/x86/annotate/instructions.c |   8 ++
 tools/perf/util/annotate-data.c             | 105 +++++++++++++++++---
 tools/perf/util/annotate-data.h             |   1 +
 tools/perf/util/dwarf-aux.c                 |  11 +-
 4 files changed, 109 insertions(+), 16 deletions(-)

-- 
2.46.0.184.g6999bdac58-goog