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Message-ID: <20200526161543.GB14219@kernel.org>
Date: Tue, 26 May 2020 13:15:43 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...hat.com>,
Travis Downs <travis.downs@...il.com>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH V2] perf tools: Fix debuginfo search for Ubuntu
Em Tue, May 26, 2020 at 06:52:07PM +0300, Adrian Hunter escreveu:
> Reportedly, from 19.10 Ubuntu has begun mixing up the location of some
> debug symbol files, putting files expected to be in
> /usr/lib/debug/usr/lib into /usr/lib/debug/lib instead. Fix by adding
> another dso_binary_type.
>
> Example on Ubuntu 20.04
>
> Before:
>
> $ perf record -e intel_pt//u uname
> Linux
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.030 MB perf.data ]
> $ perf script --call-trace | head -5
> uname 14003 [005] 15321.764958566: cbr: 42 freq: 4219 MHz (156%)
> uname 14003 [005] 15321.764958566: (/usr/lib/x86_64-linux-gnu/ld-2.31.so ) 7f1e71cc4100
> uname 14003 [005] 15321.764961566: (/usr/lib/x86_64-linux-gnu/ld-2.31.so ) 7f1e71cc4df0
> uname 14003 [005] 15321.764961900: (/usr/lib/x86_64-linux-gnu/ld-2.31.so ) 7f1e71cc4e18
> uname 14003 [005] 15321.764963233: (/usr/lib/x86_64-linux-gnu/ld-2.31.so ) 7f1e71cc5128
>
> After:
>
> $ perf script --call-trace | head -5
> uname 14003 [005] 15321.764958566: cbr: 42 freq: 4219 MHz (156%)
> uname 14003 [005] 15321.764958566: (/usr/lib/x86_64-linux-gnu/ld-2.31.so ) _start
> uname 14003 [005] 15321.764961566: (/usr/lib/x86_64-linux-gnu/ld-2.31.so ) _dl_start
> uname 14003 [005] 15321.764961900: (/usr/lib/x86_64-linux-gnu/ld-2.31.so ) _dl_start
> uname 14003 [005] 15321.764963233: (/usr/lib/x86_64-linux-gnu/ld-2.31.so ) _dl_start
>
> Reported-by: Travis Downs <travis.downs@...il.com>
Thanks, applied.
- Arnaldo
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> Cc: stable@...r.kernel.org
> ---
>
>
> Changes in V2:
> Added 'break' after 'ret = -1'
>
>
> tools/perf/util/dso.c | 16 ++++++++++++++++
> tools/perf/util/dso.h | 1 +
> tools/perf/util/probe-finder.c | 1 +
> tools/perf/util/symbol.c | 2 ++
> 4 files changed, 20 insertions(+)
>
> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
> index e68e1375e3c0..be991cbbe9f8 100644
> --- a/tools/perf/util/dso.c
> +++ b/tools/perf/util/dso.c
> @@ -47,6 +47,7 @@ char dso__symtab_origin(const struct dso *dso)
> [DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO] = 'D',
> [DSO_BINARY_TYPE__FEDORA_DEBUGINFO] = 'f',
> [DSO_BINARY_TYPE__UBUNTU_DEBUGINFO] = 'u',
> + [DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO] = 'x',
> [DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO] = 'o',
> [DSO_BINARY_TYPE__BUILDID_DEBUGINFO] = 'b',
> [DSO_BINARY_TYPE__SYSTEM_PATH_DSO] = 'd',
> @@ -129,6 +130,21 @@ int dso__read_binary_type_filename(const struct dso *dso,
> snprintf(filename + len, size - len, "%s", dso->long_name);
> break;
>
> + case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
> + /*
> + * Ubuntu can mixup /usr/lib with /lib, putting debuginfo in
> + * /usr/lib/debug/lib when it is expected to be in
> + * /usr/lib/debug/usr/lib
> + */
> + if (strlen(dso->long_name) < 9 ||
> + strncmp(dso->long_name, "/usr/lib/", 9)) {
> + ret = -1;
> + break;
> + }
> + len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
> + snprintf(filename + len, size - len, "%s", dso->long_name + 4);
> + break;
> +
> case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
> {
> const char *last_slash;
> diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
> index 42b3a278ac59..8b7958f02609 100644
> --- a/tools/perf/util/dso.h
> +++ b/tools/perf/util/dso.h
> @@ -30,6 +30,7 @@ enum dso_binary_type {
> DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
> DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
> DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
> + DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
> DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
> DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
> DSO_BINARY_TYPE__GUEST_KMODULE,
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index e4cff49384f4..55924255c535 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -101,6 +101,7 @@ enum dso_binary_type distro_dwarf_types[] = {
> DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
> DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
> DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
> + DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
> DSO_BINARY_TYPE__NOT_FOUND,
> };
>
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index 7725c83996f4..44d81f90b604 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -79,6 +79,7 @@ static enum dso_binary_type binary_type_symtab[] = {
> DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
> DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
> DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
> + DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
> DSO_BINARY_TYPE__NOT_FOUND,
> };
>
> @@ -1529,6 +1530,7 @@ static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
> case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
> case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
> case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
> + case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
> case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
> case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
> return !kmod && dso->kernel == DSO_TYPE_USER;
> --
> 2.17.1
>
--
- Arnaldo
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