linux.git/tools/perf/tests, branch master

perf machine: Propagate machine__init() error to callers

2026-06-17T12:21:03+00:00

machine__init() always returns 0 even when memory allocation fails,
because commit 81f981d7ec43ed93 ("perf machine: Free root_dir in
machine__init() error path") introduced 'int err = -ENOMEM' and an
error cleanup path but left the final 'return 0' instead of
'return err'.

Fix by returning err, check the return value in __machine__new_host()
which was ignoring it, and change machines__init() from void to int so
it too can propagate the error to perf_session__new(), aslr_tool__init()
and test callers.

The error cleanup also used zfree(&machine->kmaps), but kmaps is a
refcounted maps structure — use maps__zput() to properly drop the
reference, matching machine__exit().

Move dsos__init() and threads__init() before the first fallible
allocation (maps__new) so that machine__exit() is safe to call on
any machine struct that machine__init() touched, even on early failure.

Fixes: 81f981d7ec43ed93 ("perf machine: Free root_dir in machine__init() error path")
Reported-by: sashiko-bot 
Cc: Ian Rogers 
Cc: Jiri Olsa 
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo

perf test: Add inject ASLR test

2026-06-15T17:33:49+00:00

Add a new shell test to verify the feature. The test covers:
- Basic address remapping for user space samples.
- Pipe mode coverage for piped into.
- Callchain address remapping.
- Consistency of output before and after injection.
- Pipe mode report consistency.
- Dropping of samples that leak ASLR info (physical addresses).
- Kernel address remapping (utilizing a dedicated kernel-intensive VFS
  dd workload to guarantee continuous timer interrupts sampling flow
  inside kernel privilege states).
- Kernel report consistency with address normalization.

The test suite is hardened with global 'set -o pipefail' assertions
to catch pipeline failures, stream-consuming awk processors to handle
SIGPIPE signals, and a dedicated pipe output scenario validating raw
'perf inject -o -' stdout streams.

Note on kernel DSO normalization in the test script:
The test script deliberately normalizes all kernel DSOs to a generic
[kernel] tag before diffing, as obfuscating physical kernel addresses
forces perf report to occasionally shift samples between individual
modules and [kernel.kallsyms] due to the lack of valid host module
boundary maps.

Note on ARM:
Kernel-based ASLR test cases (test_kernel_aslr and test_kernel_report_aslr)
are skipped on ARM architectures (aarch64 and arm*) to bypass high latency
constraints (such as check_invariants() spending excessive execution time
in maps__split_kallsyms() on debug builds) and symbolization inconsistencies.

Assisted-by: Antigravity:gemini-3.1-pro
Signed-off-by: Ian Rogers 
Tested-by: James Clark 
Cc: Adrian Hunter 
Cc: Gabriel Marin 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Signed-off-by: Arnaldo Carvalho de Melo

perf test: Compile named_threads workload with -O0

2026-06-12T00:14:30+00:00

The work loop relies on the compiler not optimizing it away, although
named_threads_work is not static for that reason, the compiler could
still do it.

Fix it by compiling without optimization. Also add -fno-inline for
consistency and in case anyone wants to look at callstacks.

Fixes: b5dd510be55e8670 ("perf test: Add named_threads workload")
Closes: https://lore.kernel.org/all/20260609160001.2739E1F00893@smtp.kernel.org
Reported-by: sashiko-bot 
Reviewed-by: Leo Yan 
Signed-off-by: James Clark 
Cc: Ian Rogers 
Cc: Namhyung Kim 
Signed-off-by: Arnaldo Carvalho de Melo

perf test: Truncate printed test descriptions dynamically to avoid terminal wrapping

2026-06-11T15:05:26+00:00

When test descriptions are extremely long (e.g., the truncated perf.data
graceful handling test is 103 characters long), they wrap across terminal
boundaries.

Because the ANSI escape code to delete the line (PERF_COLOR_DELETE_LINE)
only clears a single terminal line, visual wrapping leaves orphan
wrapped lines on the screen, which results in the test description being
printed multiple times.

Resolve this by checking the terminal width (get_term_dimensions) and
dynamically truncating the printed test description to fit within the
available columns, leaving safety space for the prefix index and status
suffix.

Also, remove the width padding from the test suite headers which do not
display inline status messages. This prevents their trailing colons from
wrapping onto new lines on standard width terminals.

Finally, avoid GCC 16's -Wformat-truncation warnings by delegating the
description padding to pr_info's %-*s format specifier instead of padding
within a temporary buffer, and clamp the truncation limit to the temporary
buffer's size.

JUnit XML output and the failure summary report still print the full,
untruncated test descriptions.

Assisted-by: Gemini-CLI:Google Gemini 3.1 Pro
Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Fix uninitialized pathname on uncompressed fallback in filename__decompress()

2026-06-10T21:56:01+00:00

filename__decompress() has an early return path for files that are not
actually compressed.  This path returns the fd from open() directly but
never writes to the pathname output parameter, leaving the caller with
an uninitialized buffer despite a successful return.

Callers like dso__decompress_kmodule_path() pass pathname to
decompress_kmodule() which uses it to set the decompressed file path.
If pathname is uninitialized, subsequent operations on the path produce
undefined behavior.

Fix by setting pathname to an empty string on the uncompressed path.
Callers already check for an empty pathname to distinguish temporary
decompressed files (which need unlink) from the original file.

Reported-by: sashiko-bot 
Fixes: 7ac22b088afe26a4 ("perf tools: Add filename__decompress function")
Cc: Jiri Olsa 
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo

perf test cs-etm: Move existing tests to coresight folder

2026-06-10T21:55:49+00:00

There is a subfolder for Coresight tests so might as well keep them all
in here.

Reviewed-by: Leo Yan 
Signed-off-by: James Clark 
Cc: Amir Ayupov 
Cc: Ian Rogers 
Cc: Jiri Olsa 
Cc: Jonathan Corbet 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Paschalis Mpeis 
Cc: Shuah Khan 
Cc: Suzuki Poulouse 
Signed-off-by: Arnaldo Carvalho de Melo

perf test cs-etm: Speed up disassembly test

2026-06-10T21:55:49+00:00

We can use exit snapshot to limit the amount of trace to decode here
too. Also each call to objdump is quite expensive on kcore so limit it
to 2 samples instead of 30. We only want to see if there is no data at
all.

Reviewed-by: Leo Yan 
Signed-off-by: James Clark 
Cc: Amir Ayupov 
Cc: Ian Rogers 
Cc: Jiri Olsa 
Cc: Jonathan Corbet 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Paschalis Mpeis 
Cc: Shuah Khan 
Cc: Suzuki Poulouse 
Signed-off-by: Arnaldo Carvalho de Melo

perf test cs-etm: Add all branch instructions to test

2026-06-10T21:55:49+00:00

If we reduce the number of samples searched to speed up the test, then
there will be less chance of hitting one of these branches. Extend the
regex to cover all branches so the test will always pass.

Reviewed-by: Leo Yan 
Signed-off-by: James Clark 
Cc: Amir Ayupov 
Cc: Ian Rogers 
Cc: Jiri Olsa 
Cc: Jonathan Corbet 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Paschalis Mpeis 
Cc: Shuah Khan 
Cc: Suzuki Poulouse 
Signed-off-by: Arnaldo Carvalho de Melo

perf test cs-etm: Make disassembly test use kcore

2026-06-10T21:55:49+00:00

Hits in modules return empty disassembly with vmlinux as an input to
objdump. Make the disassembly test more reliable by always using kcore.
And update the comments to say that this is supported by the script.

Signed-off-by: James Clark 
Cc: Amir Ayupov 
Cc: Ian Rogers 
Cc: Jiri Olsa 
Cc: Jonathan Corbet 
Cc: Leo Yan 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Paschalis Mpeis 
Cc: Shuah Khan 
Cc: Suzuki Poulouse 
Signed-off-by: Arnaldo Carvalho de Melo

perf test cs-etm: Remove unused Coresight workloads

2026-06-10T21:55:49+00:00

These are now unused and had various issues like not working with out of
source builds and being slow to compile. Delete them.

Signed-off-by: James Clark 
Tested-by: Leo Yan 
Cc: Amir Ayupov 
Cc: Ian Rogers 
Cc: Jiri Olsa 
Cc: Jonathan Corbet 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Paschalis Mpeis 
Cc: Shuah Khan 
Cc: Suzuki Poulouse 
Signed-off-by: Arnaldo Carvalho de Melo