linux.git/tools/perf/Makefile.config, branch v6.11

perf: build: Link lib 'zstd' for static build

2024-07-26T18:15:47+00:00

When build static perf, Makefile reports the error:

  Makefile.config:480: No libdw DWARF unwind found, Please install
  elfutils-devel/libdw-dev >= 0.158 and/or set LIBDW_DIR

The libdw has been installed on the system, but the build system fails
to build the feature detecting binary 'test-libdw-dwarf-unwind'. The
failure is caused by missing to link the lib 'zstd'.

Link lib 'zstd' for the static build, in the end, the dwarf feature can
be enabled in the static perf.

Signed-off-by: Leo Yan 
Tested-by: Ian Rogers 
Cc: amadio@gentoo.org
Cc: James Clark 
Cc: Thomas Richter 
Link: https://lore.kernel.org/r/20240717082211.524826-6-leo.yan@arm.com
Signed-off-by: Namhyung Kim

perf: build: Only link libebl.a for old libdw

2024-07-26T18:15:25+00:00

Since libdw version 0.177, elfutils has merged libebl.a into libdw (see
the commit "libebl: Don't install libebl.a, libebl.h and remove backends
from spec." in the elfutils repository).

As a result, libebl.a does not exist on Debian Bullseye and newer
releases, causing static perf builds to fail on these distributions.

This commit checks the libdw version and only links libebl.a if it
detects that the libdw version is older than 0.177.

Signed-off-by: Leo Yan 
Tested-by: Ian Rogers 
Cc: amadio@gentoo.org
Cc: James Clark 
Cc: Thomas Richter 
Link: https://lore.kernel.org/r/20240717082211.524826-4-leo.yan@arm.com
Signed-off-by: Namhyung Kim

perf: build: Set Python configuration for cross compilation

2024-07-26T18:15:09+00:00

Python configuration has dedicated folders for different architectures.
For example, Python 3.11 has two folders as shown below, one for Arm64
and another for x86_64:

  /usr/lib/python3.11/config-3.11-aarch64-linux-gnu/
  /usr/lib/python3.11/config-3.11-x86_64-linux-gnu/

This commit updates the Python configuration path based on the
compiler's machine type, guiding the compiler to find the correct path
for Python libraries. It also renames the generated .so file name to
match the machine name.

Signed-off-by: Leo Yan 
Tested-by: Ian Rogers 
Cc: amadio@gentoo.org
Cc: James Clark 
Cc: Thomas Richter 
Link: https://lore.kernel.org/r/20240717082211.524826-3-leo.yan@arm.com
Signed-off-by: Namhyung Kim

tools: Make pkg-config dependency checks usable by other tools

2024-07-17T20:14:35+00:00

Other tools, in tools/verification and tools/tracing, make use of
libtraceevent and libtracefs as dependencies. This allows setting
up the feature check flags for them as well.

Signed-off-by: Guilherme Amadio 
Tested-by: Thorsten Leemhuis 
Tested-by: Leo Yan 
Acked-by: Steven Rostedt (Google) 
Cc: linux-trace-devel@vger.kernel.org
Link: https://lore.kernel.org/r/20240717174739.186988-3-amadio@gentoo.org
Signed-off-by: Namhyung Kim

perf build: Warn if libtracefs is not found

2024-07-17T20:13:59+00:00

Signed-off-by: Guilherme Amadio 
Tested-by: Thorsten Leemhuis 
Tested-by: Leo Yan 
Acked-by: Steven Rostedt (Google) 
Cc: linux-trace-devel@vger.kernel.org
Link: https://lore.kernel.org/r/20240717174739.186988-2-amadio@gentoo.org
Signed-off-by: Namhyung Kim

perf build: Conditionally add feature check flags for libtrace{event,fs}

2024-07-11T22:08:49+00:00

This avoids reported warnings when the packages are not installed.

[namhyung]: Removed the dummy assignment and unnecessary ifeq checks.

Fixes: 0f0e1f445690 ("perf build: Use pkg-config for feature check for libtrace{event,fs}")
Signed-off-by: Guilherme Amadio 
Cc: Leo Yan 
Cc: Thorsten Leemhuis 
Link: https://lore.kernel.org/r/20240628203432.3273625-1-amadio@gentoo.org
Signed-off-by: Namhyung Kim

perf python: Switch module to linking libraries from building source

2024-06-26T18:08:00+00:00

setup.py was building most perf sources causing setup.py to mimic the
Makefile logic as well as flex/bison code to be stubbed out, due to
complexity building. By using libraries fewer functions are stubbed
out, the build is faster and the Makefile logic is reused which should
simplify updating. The libraries are passed through LDFLAGS to avoid
complexity in python.

Force the -fPIC flag for libbpf.a to ensure it is suitable for linking
into the perf python module.

Signed-off-by: Ian Rogers 
Reviewed-by: James Clark 
Cc: Suzuki K Poulose 
Cc: Kees Cook 
Cc: Palmer Dabbelt 
Cc: Albert Ou 
Cc: Nick Terrell 
Cc: Gary Guo 
Cc: Alex Gaynor 
Cc: Boqun Feng 
Cc: Wedson Almeida Filho 
Cc: Ze Gao 
Cc: Alice Ryhl 
Cc: Andrei Vagin 
Cc: Yicong Yang 
Cc: Jonathan Cameron 
Cc: Guo Ren 
Cc: Miguel Ojeda 
Cc: Will Deacon 
Cc: Mike Leach 
Cc: Leo Yan 
Cc: Oliver Upton 
Cc: John Garry 
Cc: Benno Lossin 
Cc: Björn Roy Baron 
Cc: Andreas Hindborg 
Cc: Paul Walmsley 
Signed-off-by: Namhyung Kim 
Link: https://lore.kernel.org/r/20240625214117.953777-8-irogers@google.com

perf build: Ensure libtraceevent and libtracefs versions have 3 components

2024-06-21T23:19:12+00:00

When either of these have a shorter version, like 1.8, the expression
that computes the version has a syntax error that can be seen in the
output of make:

expr: syntax error: missing argument after +

Link: https://bugs.gentoo.org/917559
Reported-by: Peter Volkov 
Signed-off-by: Guilherme Amadio 
Reviewed-by: Leo Yan 
Signed-off-by: Namhyung Kim 
Link: https://lore.kernel.org/r/20240606153625.2255470-3-amadio@gentoo.org

perf build: Use pkg-config for feature check for libtrace{event,fs}

2024-06-21T23:19:03+00:00

Needed to add required include directories for the feature detection
to succeed. The header tracefs.h is installed either into the include
directory /usr/include/tracefs/tracefs.h when using the Makefile, or
into /usr/include/libtracefs/tracefs.h when using meson to build
libtracefs. The header tracefs.h uses #include  from
libtraceevent, so pkg-config needs to pick the correct include directory
for libtracefs and add the one for libtraceevent to succeed.

Note that in baa2ca59ec1e31ccbe3f24ff0368152b36f68720 the variable
LIBTRACEEVENT_DIR was introduced, and now the method to compile against
non-standard locations requires PKG_CONFIG_PATH to be set instead, which
works for both libtraceevent and libtracefs.

Signed-off-by: Guilherme Amadio 
Reviewed-by: Leo Yan 
Signed-off-by: Namhyung Kim 
Link: https://lore.kernel.org/r/20240606153625.2255470-2-amadio@gentoo.org

perf build: Pretend scandirat is missing with msan

2024-04-27T01:13:10+00:00

Memory sanitizer lacks an interceptor for scandirat, reporting all
memory it allocates as uninitialized. Memory sanitizer has a scandir
interceptor so use the fallback function in this case. This allows
'perf test' to run under memory sanitizer.

Additional notes from Ian on running in this mode:

Note, as msan needs to instrument memory allocations libraries need to
be compiled with it. I lacked the msan built libraries and so built
with:
```
$ make -C tools/perf O=/tmp/perf DEBUG=1 EXTRA_CFLAGS="-O0 -g
-fno-omit-frame-pointer -fsanitize=memory
-fsanitize-memory-track-origins" CC=clang CXX=clang++ HOSTCC=clang
NO_LIBTRACEEVENT=1 NO_LIBELF=1 BUILD_BPF_SKEL=0 NO_LIBPFM=1
```
oh, I disabled libbpf here as the bpf system call also lacks msan interceptors.

Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Mark Rutland 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Link: https://lore.kernel.org/r/20240320163244.1287780-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo