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Date: Mon, 7 Apr 2025 18:58:28 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Howard Chu <howardchu95@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Ian Rogers <irogers@google.com>,
	Kan Liang <kan.liang@linux.intel.com>, Jiri Olsa <jolsa@kernel.org>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	linux-perf-users@vger.kernel.org,
	Dmitry Vyukov <dvyukov@google.com>
Subject: Re: [perf top] annotation doesn't work, libunwind doesn't seem to be
 working either
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* Howard Chu <howardchu95@gmail.com> wrote:

> > I tried to install the libunwind-19-dev package, I tried to
> > uninstall/reinstall - no combination seems to work.
> 
>  $ apt list --installed | grep libunwind
> 
> WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
> 
> libunwind-dev/oracular,now 1.6.2-3.1 amd64 [installed]
> libunwind8/oracular,now 1.6.2-3.1 amd64 [installed,automatic]
> 
> Built perf with make clean install, my libunwind is on.
> 
> ...                               libunwind: [ on  ]

I seem to have the exact same build environment:

  starship:~> apt list --installed | grep libunwind

  WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

  libunwind-dev/oracular,now 1.6.2-3.1 amd64 [installed]
  libunwind8/oracular,now 1.6.2-3.1 amd64 [installed]

Yet:

  Makefile.config:1142: No openjdk development package found, please install JDK package, e.g. openjdk-8-jdk, java-1.8.0-openjdk-devel
  Makefile.config:1155: libpfm4 not found, disables libpfm4 support. Please install libpfm4-dev
  Makefile.config:1187: libtracefs is missing. Please install libtracefs-dev/libtracefs-devel

  Auto-detecting system features:
...                                   libdw: [ on  ]
...                                   glibc: [ on  ]
...                                  libbfd: [ on  ]
...                          libbfd-buildid: [ on  ]
...                                  libelf: [ on  ]
...                                 libnuma: [ on  ]
...                  numa_num_possible_cpus: [ on  ]
...                                 libperl: [ on  ]
...                               libpython: [ on  ]
...                               libcrypto: [ on  ]
...                               libunwind: [ OFF ]
...                             libcapstone: [ on  ]
...                               llvm-perf: [ on  ]
...                                    zlib: [ on  ]
...                                    lzma: [ on  ]
...                               get_cpuid: [ on  ]
...                                     bpf: [ on  ]
...                                  libaio: [ on  ]
...                                 libzstd: [ on  ]




> 
> But when I ran perf check,
> 
>  $ perf check feature libunwind
>              libunwind: [ OFF ]  # HAVE_LIBUNWIND_SUPPORT
> 
> libunwind is OFF.

Same here.

Thanks,

	Ingo