linux.git/tools/testing/selftests/user_events/perf_test.c, branch vsnprintf Linux kernel source tree selftests/user_events: Fix to unmount tracefs when test created mount 2023-09-18T17:04:52+00:00 Beau Belgrave beaub@linux.microsoft.com 2023-09-15T22:27:54+00:00 8ed99af4a266a3492d773b5d85c3f8e9f81254b6 Fix to unmount tracefs if the self-test mounted it to allow testing. If tracefs was already mounted, this does nothing. Suggested-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/all/29fce076-746c-4650-8358-b4e0fa215cf7@sirena.org.uk/ Fixes: a06023a8f78d ("selftests/user_events: Fix failures when user_events is not installed") Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com> Reviewed-by: Mark Brown <broonie@kernel.org> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> 
Fix to unmount tracefs if the self-test mounted it to allow testing.
If tracefs was already mounted, this does nothing.

Suggested-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/all/29fce076-746c-4650-8358-b4e0fa215cf7@sirena.org.uk/
Fixes: a06023a8f78d ("selftests/user_events: Fix failures when user_events is not installed")

Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
selftests/user_events: Fix failures when user_events is not installed 2023-09-11T23:04:11+00:00 Beau Belgrave beaub@linux.microsoft.com 2023-09-08T20:19:16+00:00 a06023a8f78d3e9e73ca4363ccf3871a06e16ecc When user_events is not installed the self tests currently fail. Now that these self tests run by default we need to ensure they don't fail when user_events was not enabled for the kernel being tested. Add common methods to detect if tracefs and user_events is enabled. If either is not enabled skip the test. If tracefs is enabled, but is not mounted, mount tracefs and fail if there were any errors. Fail if not run as root. Fixes: 68b4d2d58389 ("selftests/user_events: Reenable build") Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org> Link: https://lore.kernel.org/all/CA+G9fYuugZ0OMeS6HvpSS4nuf_A3s455ecipGBvER0LJHojKZg@mail.gmail.com/ Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> 
When user_events is not installed the self tests currently fail. Now
that these self tests run by default we need to ensure they don't fail
when user_events was not enabled for the kernel being tested.

Add common methods to detect if tracefs and user_events is enabled. If
either is not enabled skip the test. If tracefs is enabled, but is not
mounted, mount tracefs and fail if there were any errors. Fail if not
run as root.

Fixes: 68b4d2d58389 ("selftests/user_events: Reenable build")
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Link: https://lore.kernel.org/all/CA+G9fYuugZ0OMeS6HvpSS4nuf_A3s455ecipGBvER0LJHojKZg@mail.gmail.com/

Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
selftests/user_events: Add perf self-test for empty arguments events 2023-06-14T16:41:53+00:00 sunliming sunliming@kylinos.cn 2023-06-06T06:20:27+00:00 42187bdc3ca45435bec96c66a90276315b2db1cb Tests to ensure events that has empty arguments can input trace record correctly when using perf. Link: https://lkml.kernel.org/r/20230606062027.1008398-5-sunliming@kylinos.cn Acked-by: Beau Belgrave <beaub@linux.microsoft.com> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: sunliming <sunliming@kylinos.cn> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> 
Tests to ensure events that has empty arguments can input trace record
correctly when using perf.

Link: https://lkml.kernel.org/r/20230606062027.1008398-5-sunliming@kylinos.cn

Acked-by: Beau Belgrave <beaub@linux.microsoft.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: sunliming <sunliming@kylinos.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
selftests/user_events: Clear the events after perf self-test 2023-06-14T16:41:53+00:00 sunliming sunliming@kylinos.cn 2023-06-06T06:20:26+00:00 4b56c21b11dcd2c6e4c6ee81bde77bea05e64db0 When the self test is completed, perf self-test left the user events not to be cleared. Clear the events by unregister and delete the event. Link: https://lkml.kernel.org/r/20230606062027.1008398-4-sunliming@kylinos.cn Acked-by: Beau Belgrave <beaub@linux.microsoft.com> Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: sunliming <sunliming@kylinos.cn> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> 
When the self test is completed, perf self-test left the user events not to
be cleared. Clear the events by unregister and delete the event.

Link: https://lkml.kernel.org/r/20230606062027.1008398-4-sunliming@kylinos.cn

Acked-by: Beau Belgrave <beaub@linux.microsoft.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: sunliming <sunliming@kylinos.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
tracing/user_events: Update self-tests to write ABI 2023-03-29T10:52:08+00:00 Beau Belgrave beaub@linux.microsoft.com 2023-03-28T23:52:13+00:00 0d309f04f8089759bed62bf6c8a805b31d725cb8 ABI has been changed to remote writes, update existing test cases to use this new ABI to ensure existing functionality continues to work. Link: https://lkml.kernel.org/r/20230328235219.203-7-beaub@linux.microsoft.com Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> 
ABI has been changed to remote writes, update existing test cases to use
this new ABI to ensure existing functionality continues to work.

Link: https://lkml.kernel.org/r/20230328235219.203-7-beaub@linux.microsoft.com

Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
selftests: use canonical ftrace path 2023-03-29T10:52:07+00:00 Ross Zwisler zwisler@google.com 2023-03-13T21:17:43+00:00 4336cc15b9f7b34bc0ddc85c76f71be6a0355028 The canonical location for the tracefs filesystem is at /sys/kernel/tracing. But, from Documentation/trace/ftrace.rst: Before 4.1, all ftrace tracing control files were within the debugfs file system, which is typically located at /sys/kernel/debug/tracing. For backward compatibility, when mounting the debugfs file system, the tracefs file system will be automatically mounted at: /sys/kernel/debug/tracing A few spots in tools/testing/selftests still refer to this older debugfs path, so let's update them to avoid confusion. Link: https://lkml.kernel.org/r/20230313211746.1541525-1-zwisler@kernel.org Cc: "Tobin C. Harding" <me@tobin.cc> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Tycho Andersen <tycho@tycho.pizza> Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org> Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com> Signed-off-by: Ross Zwisler <zwisler@google.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> 
The canonical location for the tracefs filesystem is at /sys/kernel/tracing.

But, from Documentation/trace/ftrace.rst:

  Before 4.1, all ftrace tracing control files were within the debugfs
  file system, which is typically located at /sys/kernel/debug/tracing.
  For backward compatibility, when mounting the debugfs file system,
  the tracefs file system will be automatically mounted at:

  /sys/kernel/debug/tracing

A few spots in tools/testing/selftests still refer to this older debugfs
path, so let's update them to avoid confusion.

Link: https://lkml.kernel.org/r/20230313211746.1541525-1-zwisler@kernel.org

Cc: "Tobin C. Harding" <me@tobin.cc>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Tycho Andersen <tycho@tycho.pizza>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com>
Signed-off-by: Ross Zwisler <zwisler@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
tracing/user_events: Use bits vs bytes for enabled status page data 2022-09-29T14:17:37+00:00 Beau Belgrave beaub@linux.microsoft.com 2022-07-28T23:33:08+00:00 39d6d08b2edf99c4b39a689a70bf0adee065b357 User processes may require many events and when they do the cache performance of a byte index status check is less ideal than a bit index. The previous event limit per-page was 4096, the new limit is 32,768. This change adds a bitwise index to the user_reg struct. Programs check that the bit at status_bit has a bit set within the status page(s). Link: https://lkml.kernel.org/r/20220728233309.1896-6-beaub@linux.microsoft.com Link: https://lore.kernel.org/all/2059213643.196683.1648499088753.JavaMail.zimbra@efficios.com/ Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> 
User processes may require many events and when they do the cache
performance of a byte index status check is less ideal than a bit index.
The previous event limit per-page was 4096, the new limit is 32,768.

This change adds a bitwise index to the user_reg struct. Programs check
that the bit at status_bit has a bit set within the status page(s).

Link: https://lkml.kernel.org/r/20220728233309.1896-6-beaub@linux.microsoft.com
Link: https://lore.kernel.org/all/2059213643.196683.1648499088753.JavaMail.zimbra@efficios.com/

Suggested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
user_events: Add self-test for perf_event integration 2022-02-11T03:37:59+00:00 Beau Belgrave beaub@linux.microsoft.com 2022-01-18T20:43:23+00:00 3a6163893a9a6a90e086234ee205c1f74eeb5f84 Tests perf can be attached to and written out correctly. Ensures attach updates status bits in user programs. Link: https://lkml.kernel.org/r/20220118204326.2169-10-beaub@linux.microsoft.com Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> 
Tests perf can be attached to and written out correctly. Ensures attach
updates status bits in user programs.

Link: https://lkml.kernel.org/r/20220118204326.2169-10-beaub@linux.microsoft.com

Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>