kernel/linux.git/tools/perf/tests/shell, branch v7.2-rc1

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 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

perf test cs-etm: Speed up basic test

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

Like the name says, this should be the most basic test possible. Kernel recording is slow and already has coverage on the systemwide test. Perf report output also has coverage elsewhere. 'ls' also produces more trace than 'true'. We only want to test if the combination of recording options works at all, so fix all of these things to make it as fast as possible. 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: Reduce snapshot size

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

The default buffer size for root is 4MB which is very slow to decode. We only need a few KB to verify that the dd process is hit so reduce the size to 128KB. 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: Skip if not root

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

Use the common idiom for skipping tests if not running as root, which is required for these tests. 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 duplicate branch tests

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

We already test branch output in perf script mode, but then retest it in Perf report mode. This is more of a test of Perf itself than Coresight because Perf uses the same samples to generate both outputs. Also we're already testing instruction output in Perf report mode. Remove this test for a speedup. On the systemwide test also remove the Perf report test because systemwide mode records a lot more data so running multiple tests on it has a big runtime impact. 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