rtla/tests: Test setting default options

Add function to test engine to test with pre-set osnoise options, and
use it to test whether osnoise period (as an example) is set correctly.

The test works

rtla/tests: Test setting default options

Add function to test engine to test with pre-set osnoise options, and
use it to test whether osnoise period (as an example) is set correctly.

The test works by pre-setting a high period of 10 minutes and stop on
threshold. Thus, it is easy to check whether rtla is properly resetting
the period to default: if it is, the test will complete on time, since
the first sample will overflow the threshold. If not, it will time out.

Cc: Luis Goncalves <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Tomas Glozar <[email protected]>
Reviewed-by: John Kacur <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

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rtla/tests: Reset osnoise options before check

Remove any dangling tracing instances from previous improperly exited
runs of rtla, and reset osnoise options to default before running a test
case.

T

rtla/tests: Reset osnoise options before check

Remove any dangling tracing instances from previous improperly exited
runs of rtla, and reset osnoise options to default before running a test
case.

This ensures that the test results are deterministic. Specific test
cases checked that rtla behaves correctly even when the tracer state is
not clean will be added later.

Cc: John Kacur <[email protected]>
Cc: Luis Goncalves <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Tomas Glozar <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

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tools/rtla: Add basic test suite

Implement a simple TAP-based test engine in bash and a few basic tests
using it, to be used to check for bugs and regressions.

A new "check" target is added to the

tools/rtla: Add basic test suite

Implement a simple TAP-based test engine in bash and a few basic tests
using it, to be used to check for bugs and regressions.

A new "check" target is added to the rtla Makefile that runs the test suite
using the "prove" command implemented by Test::Harness.

The only test format currently supported is running rtla with defined
command arguments per test, checking its exit code. In case the exit
code is non-zero, the output of rtla is displayed, together with the
exit code.

The test cases are adopted from rtla tests in the Continuous Kernel
Integration (CKI) project [1] with the authors' approval.

[1] https://gitlab.com/redhat/centos-stream/tests/kernel/kernel-tests/-/blob/main/rt-tests/us/rtla/

Cc: John Kacur <[email protected]>
Cc: Luis Goncalves <[email protected]>
Cc: Chang Yin <[email protected]>
Cc: Qiao Zhao <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Tomas Glozar <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

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