linux-kernel - perf tool: About "perf arm64: Inject missing frames when using 'perf record --call-graph=fp'"

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Message-ID: <5f1d8b3f-0afa-2724-4ff1-f061939c68c5@huawei.com>
Date:   Tue, 5 Apr 2022 15:04:51 +0100
From:   John Garry <john.garry@...wei.com>
To:     <alexandre.truong@....com>
CC:     <linux-perf-users@...r.kernel.org>,
        "jolsa@...nel.org >> Jiri Olsa" <jolsa@...nel.org>,
        <german.gomez@....com>, <james.clark@....com>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: perf tool: About "perf arm64: Inject missing frames when using 'perf
 record --call-graph=fp'"

Hi Alexandre,

I notice that with commit b9f6fbb3b2c2 ("perf arm64: Inject missing 
frames when using 'perf record --call-graph=fp'") that I get messages 
spewing the console when running perf record+report, as below:

john@...ntu:~/linux$sudo tools/perf/perf record -ag fio null12.fio
john@...ntu:~/linux$sudo tools/perf/perf report > report
unwind: can't read reg 29
unwind: can't read reg 29
unwind: can't read reg 29
unwind: can't read reg 29
...

Do you know the possible cause? I haven't checked...

Thanks,
john