linux-kernel - Re: [PATCH v3 0/2] perf probe: fix regression introduced by switch to die_get_decl

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Message-ID: <ZKwLKXL6rkoShDNc@kernel.org>
Date:   Mon, 10 Jul 2023 10:44:09 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Linux regressions mailing list <regressions@...ts.linux.dev>
Cc:     Georg Müller <georgmueller@....net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/2] perf probe: fix regression introduced by switch
 to die_get_decl_file

Em Mon, Jul 10, 2023 at 02:32:28PM +0200, Linux regression tracking (Thorsten Leemhuis) escreveu:
> Hi, Thorsten here, the Linux kernel's regression tracker. Top-posting
> for once, to make this easily accessible to everyone.
> 
> Masami, Arnaldo, what's up here? Georg (who is not a regular
> contributor) afaics found a regression in a commit you
> authored/committed and even provided a patch-set to fix it (the first
> one nearly four weeks ago, e.g. before the merge window started), but
> hasn't received much support from your side to get this in. Could you
> please look into this to get this cleared up? Or am I missing something
> and progress to fix this has been made?

I'm back from a 2 week vacation, going thru the pile, probably fell thru
the cracks and Namyung, that processed patches while I was away didn't
notice it either.

I'm checking,

- Arnaldo
 
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> --
> Everything you wanna know about Linux kernel regression tracking:
> https://linux-regtracking.leemhuis.info/about/#tldr
> If I did something stupid, please tell me, as explained on that page.
> 
> 
> On 28.06.23 10:45, Georg Müller wrote:
> > When switching from dwarf_decl_file() to die_get_decl_file(), a regression
> > was introduced when having a binary where the DWARF info is split to
> > multiple CUs. It is not possible to add probes to certain functions.
> > 
> > These patches introduce a testcase which shows the current regression
> > and a fix for the issue
> > 
> > Signed-off-by: Georg Müller <georgmueller@....net>
> > Link: https://lore.kernel.org/r/5a00d5a5-7be7-ef8a-4044-9a16249fff25@gmx.net/
> > 
> > ---
> > Changes in v2:
> >  - Add testcase
> > 
> > Changes in v3:
> >  - start new thread
> >  - add stable to cc
> > 
> > Georg Müller (2):
> >   perf probe: add test for regression introduced by switch to
> >     die_get_decl_file
> >   perf probe: read DWARF files from the correct CU
> > 
> >  .../shell/test_uprobe_from_different_cu.sh    | 77 +++++++++++++++++++
> >  tools/perf/util/dwarf-aux.c                   |  4 +-
> >  2 files changed, 80 insertions(+), 1 deletion(-)
> >  create mode 100755 tools/perf/tests/shell/test_uprobe_from_different_cu.sh
> > 
> > --
> > 2.41.0
> > 
> > 
> > 

-- 

- Arnaldo