linux.git/tools/perf/tests/task-exit.c, branch v7.3-rc2

perf evlist: Add reference count checking

2026-06-30T17:17:11+00:00

Now the evlist is reference counted, add reference count checking so
that gets and puts are paired and easy to debug. Reference count
checking is documented here:
https://perfwiki.github.io/main/reference-count-checking/

This large patch is adding accessors to evlist functions and switching
to their use. There was some minor renaming as evlist__mmap is now an
accessor to the mmap variable, and the original evlist__mmap is
renamed to evlist__do_mmap.

Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Alice Rogers 
Cc: Dapeng Mi 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Leo Yan 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Thomas Richter 
Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim

perf evlist: Add reference count

2026-06-30T17:17:10+00:00

This a no-op for most of the perf tool. The reference count is set to
1 at allocation, the put will see the 1, decrement it and perform the
delete.

The purpose for adding the reference count is for the python code. Prior
to this change the python code would clone evlists, but this has issues
if events are opened, etc.

This change adds a reference count for the evlists and a later change
will add it to evsels. The combination is needed for the python code to
operate correctly (not hit asserts in the evsel clone), but the changes
are broken apart for the sake of smaller patches.

Assisted-by: Gemini:gemini-3.1-pro-preview
Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Alice Rogers 
Cc: Dapeng Mi 
Cc: Ingo Molnar 
Cc: James Clark 
Cc: Leo Yan 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Thomas Richter 
Signed-off-by: Arnaldo Carvalho de Melo 
Signed-off-by: Namhyung Kim

perf target: Remove uid from target

2025-06-09T18:18:18+00:00

Gathering threads with a uid by scanning /proc is inherently racy
leading to perf_event_open failures that quit perf. All users of the
functionality now use BPF filters, so remove uid and uid_str from
target.

Signed-off-by: Ian Rogers 
Link: https://lore.kernel.org/r/20250604174545.2853620-10-irogers@google.com
Signed-off-by: Namhyung Kim

perf test: Run parallel tests in two passes

2024-10-28T16:32:58+00:00

In pass 1 run all tests that succeed when run in parallel. In pass 2
sequentially run all remaining tests that are flagged as
"exclusive". Sequential and dont_fork tests keep to run in pass 1.
Read the exclusive flag from the shell test descriptions, but remove
from display to avoid >100 characters. Add error handling to finish
tests if starting a later test fails. Mark the task-exit test as
exclusive due to issues reported-by James Clark.

Tested-by: James Clark 
Signed-off-by: Ian Rogers 
Cc: Colin Ian King 
Cc: Howard Chu 
Cc: Weilin Wang 
Cc: Ilya Leoshkevich 
Cc: Thomas Richter 
Cc: Andi Kleen 
Cc: Dapeng Mi 
Cc: Athira Jajeev 
Cc: Michael Petlan 
Cc: Veronika Molnarova 
Link: https://lore.kernel.org/r/20241025192109.132482-8-irogers@google.com
Signed-off-by: Namhyung Kim

libperf cpumap: Rename perf_cpu_map__dummy_new() to perf_cpu_map__new_any_cpu()

2023-12-12T17:01:47+00:00

Rename perf_cpu_map__dummy_new() to perf_cpu_map__new_any_cpu() to
better indicate this is creating a CPU map for the perf_event_open "any"
CPU case.

Reviewed-by: James Clark 
Signed-off-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Alexandre Ghiti 
Cc: Andrew Jones 
Cc: André Almeida 
Cc: Athira Jajeev 
Cc: Atish Patra 
Cc: Changbin Du 
Cc: Darren Hart 
Cc: Davidlohr Bueso 
Cc: Huacai Chen 
Cc: Ingo Molnar 
Cc: Jiri Olsa 
Cc: John Garry 
Cc: K Prateek Nayak 
Cc: Kajol Jain 
Cc: Kan Liang 
Cc: Leo Yan 
Cc: Mark Rutland 
Cc: Mike Leach 
Cc: Namhyung Kim 
Cc: Nick Desaulniers 
Cc: Paolo Bonzini 
Cc: Paran Lee 
Cc: Peter Zijlstra 
Cc: Ravi Bangoria 
Cc: Sandipan Das 
Cc: Sean Christopherson 
Cc: Steinar H. Gunderson 
Cc: Suzuki Poulouse 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: Yang Jihong 
Cc: Yang Li 
Cc: Yanteng Si 
Cc: bpf@vger.kernel.org
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20231129060211.1890454-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo

perf test task_exit: No need for a cycles event to check if we get an PERF_RECORD_EXIT

2023-07-17T13:27:44+00:00

The intent of this test is to check we get a PERF_RECORD_EXIT as asked
for by setting perf_event_attr.task=1.

When the test was written we didn't had the "dummy" event so we went
with the default event, "cycles".

There were reports of this test failing sometimes, one of these reports
was with a PREEMPT_RT_FULL, but I noticed it failing sometimes with an
aarch64 Firefly board.

In the kernel the call to perf_event_task_output(), that generates the
PERF_RECORD_EXIT may fail when there is not enough memory in the ring
buffer, if the ring buffer is paused, etc.

So switch to using the "dummy" event to use the ring buffer just for
what the test was designed for, avoiding uneeded PERF_RECORD_SAMPLEs.

Acked-by: Ian Rogers 
Cc: Adrian Hunter 
Cc: Jiri Olsa 
Cc: Juri Lelli 
Cc: Namhyung Kim 
Link: https://lore.kernel.org/lkml/ZLGXmMuNRpx1ubFm@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

perf test: Rename struct test to test_suite

2021-11-13T13:32:22+00:00

This is to align with kunit's terminology.

Signed-off-by: Ian Rogers 
Tested-by: Sohaib Mohamed 
Acked-by: Jiri Olsa 
Cc: Alexander Shishkin 
Cc: Brendan Higgins 
Cc: Daniel Latypov 
Cc: David Gow 
Cc: Ingo Molnar 
Cc: Jin Yao 
Cc: John Garry 
Cc: Mark Rutland 
Cc: Namhyung Kim 
Cc: Paul Clarke 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Link: https://lore.kernel.org/r/20211104064208.3156807-6-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo

perf test: Move each test suite struct to its test

2021-11-13T13:30:58+00:00

Rather than export test functions, export the test struct. Rename with a
suite__ prefix to avoid name collisions.

Committer notes:

Its '&suite__vectors_page', not '&suite__vectors_pages', noticed when
cross building to arm (32-bit).

Signed-off-by: Ian Rogers 
Tested-by: Sohaib Mohamed 
Acked-by: Jiri Olsa 
Cc: Alexander Shishkin 
Cc: Brendan Higgins 
Cc: Daniel Latypov 
Cc: David Gow 
Cc: Ingo Molnar 
Cc: Jin Yao 
Cc: John Garry 
Cc: Mark Rutland 
Cc: Namhyung Kim 
Cc: Paul Clarke 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Link: https://lore.kernel.org/r/20211104064208.3156807-5-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo

perf test: Fix cpu and thread map leaks in task_exit test

2021-03-06T19:54:28+00:00

The evlist has the maps with its own refcounts so we don't need to set
the pointers to NULL.  Otherwise following error was reported by Asan.

Also change the goto label since it doesn't need to have two.

  # perf test -v 24
  24: Number of exit events of a simple workload :
  --- start ---
  test child forked, pid 145915
  mmap size 528384B

  =================================================================
  ==145915==ERROR: LeakSanitizer: detected memory leaks

  Direct leak of 32 byte(s) in 1 object(s) allocated from:
    #0 0x7fc44e50d1f8 in __interceptor_realloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:164
    #1 0x561cf50f4d2e in perf_thread_map__realloc /home/namhyung/project/linux/tools/lib/perf/threadmap.c:23
    #2 0x561cf4eeb949 in thread_map__new_by_tid util/thread_map.c:63
    #3 0x561cf4db7fd2 in test__task_exit tests/task-exit.c:74
    #4 0x561cf4d798fb in run_test tests/builtin-test.c:428
    #5 0x561cf4d798fb in test_and_print tests/builtin-test.c:458
    #6 0x561cf4d7ba53 in __cmd_test tests/builtin-test.c:679
    #7 0x561cf4d7ba53 in cmd_test tests/builtin-test.c:825
    #8 0x561cf4de7d04 in run_builtin /home/namhyung/project/linux/tools/perf/perf.c:313
    #9 0x561cf4c71a88 in handle_internal_command /home/namhyung/project/linux/tools/perf/perf.c:365
    #10 0x561cf4c71a88 in run_argv /home/namhyung/project/linux/tools/perf/perf.c:409
    #11 0x561cf4c71a88 in main /home/namhyung/project/linux/tools/perf/perf.c:539
    #12 0x7fc44e042d09 in __libc_start_main ../csu/libc-start.c:308

    ...
  test child finished with 1
  ---- end ----
  Number of exit events of a simple workload: FAILED!

Signed-off-by: Namhyung Kim 
Acked-by: Jiri Olsa 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Andi Kleen 
Cc: Ian Rogers 
Cc: Ingo Molnar 
Cc: Leo Yan 
Cc: Mark Rutland 
Cc: Peter Zijlstra 
Cc: Stephane Eranian 
Link: https://lore.kernel.org/r/20210301140409.184570-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

perf evlist: Use the right prefix for alternative 'struct evlist' constructors

2020-11-30T18:04:05+00:00

perf_evlist__ is for 'struct perf_evlist' methods, in tools/lib/perf/,
go on completing this split.

Cc: Adrian Hunter 
Cc: Ian Rogers 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Signed-off-by: Arnaldo Carvalho de Melo