linux-kernel - [PATCH v1 0/6] perf tools: Some improvements on data type profiler

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Message-ID: <20250725202809.1230085-1-zecheng@google.com>
Date: Fri, 25 Jul 2025 20:28:03 +0000
From: Zecheng Li <zecheng@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	"Liang, Kan" <kan.liang@...ux.intel.com>, Masami Hiramatsu <mhiramat@...nel.org>
Cc: Zecheng Li <zli94@...u.edu>, Xu Liu <xliuprof@...gle.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Zecheng Li <zecheng@...gle.com>
Subject: [PATCH v1 0/6] perf tools: Some improvements on data type profiler

Hi all,

I've identified several missing data type annotations within the perf
tools when annotating the Linux kernel. This patch series improves the
coverage and correctness of data type annotations.

Here's a breakdown of the changes:

Patches 1 and 2 fixes direct type matching from DWARF. They fix cases
with intrusive linked lists (e.g, sched_balance_update_blocked_averages)
where type information was previously missed.

Patch 3 utilizes this to better determine the types of stack
variables for instruction tracking.

Patch 4 skips annotations for lea instructions, as these do not involve
memory access.

Patches 5 and 6 implement a basic idea for register offset tracking
based on arithmetic operations. While this feature has known limitations
and may regress in rare cases compared to the original, it generally
improves offset tracking in most scenarios.

Note: I will be communicating from a new email address, zli94@...u.edu,
as I will soon lose access to my current email account.

Thanks,
Zecheng

Zecheng Li (6):
  perf dwarf-aux: Use signed comparison in match_var_offset
  perf dwarf-aux: More accurate variable type match for breg
  perf dwarf-aux: Better type matching for stack variables
  perf annotate: Skip annotating data types to lea instructions
  perf dwarf-aux: Find pointer type to a type
  perf annotate: Track arithmetic instructions on pointers

 tools/perf/arch/x86/annotate/instructions.c | 109 ++++++++++++++++-
 tools/perf/util/annotate-data.c             |  14 ++-
 tools/perf/util/annotate-data.h             |   6 +
 tools/perf/util/annotate.c                  |   5 +
 tools/perf/util/dwarf-aux.c                 | 125 ++++++++++++++++++--
 tools/perf/util/dwarf-aux.h                 |   4 +
 6 files changed, 247 insertions(+), 16 deletions(-)

-- 
2.50.1.470.g6ba607880d-goog