linux-kernel - Re: [PATCH 0/4] perf annotate-data: A couple of small updates

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Date: Tue, 16 Apr 2024 18:06:56 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Ian Rogers <irogers@...gle.com>, Kan Liang <kan.liang@...ux.intel.com>,
	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
Subject: Re: [PATCH 0/4] perf annotate-data: A couple of small updates

On Fri, Apr 12, 2024 at 11:33:06AM -0700, Namhyung Kim wrote:
> Hello,
> 
> I am working on improving quality of the data type profiling and I
> found some issues.  One is when more than one variables are placed at
> the same location.  Then it should find the correct one based on the
> given info rather than checking the first one and bailing out.  This
> one (patch 2) can go to the perf-tools tree.
> 
> Another issue is use of the stack pointe register when it's not the
> frame base register.  I found a case where rbp is used as the frame
> base but rsp is also used to point some stack variables.  And it
> confuses itself how to interpret the type of the variable.
> 
> I think these are rare cases but it would depends on the code pattern
> and compiler behavior.  Anyway I can see a tiny improvement in my data

Thanks, applied to perf-tools-next,

- Arnaldo
> with this change. :)
 
> Thanks,
> Namhyung
> 
> 
> Namhyung Kim (4):
>   perf annotate-data: Improve debug message with location info
>   perf dwarf-aux: Check pointer offset when checking variables
>   perf dwarf-aux: Check variable address range properly
>   perf annotate-data: Handle RSP if it's not the FB register
> 
>  tools/perf/util/annotate-data.c | 126 +++++++++++++++++++++++++-------
>  tools/perf/util/dwarf-aux.c     |  35 ++++++---
>  2 files changed, 125 insertions(+), 36 deletions(-)
> 
> 
> base-commit: 0ffc8fca5c15a70f32c8aff12c566bbd3991bd0a
> -- 
> 2.44.0.683.g7961c838ac-goog