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Test "Setup struct perf_event_attr" consists of multiple test cases that
can affect the max sample rate value for perf events. Some test cases
check this value as it should not be lowered under the set minimum for
the given test. Currently, it is possible for the test cases to affect
each other as the previous tests can lower the sample rate, leading to
a possible failure of some of the future test cases as the value is not
restored at any point.
# 10: Setup struct perf_event_attr:
--- start ---
test child forked, pid 104220
Using CPUID 0x00000000413fd0c1
running './tests/attr/test-record-C0'
Current sample rate: 10000
running './tests/attr/test-record-basic'
Current sample rate: 900
running './tests/attr/test-record-branch-any'
Current sample rate: 600
running './tests/attr/test-record-dummy-C0'
Current sample rate: 600
expected sample_period=4000, got 600
FAILED './tests/attr/test-record-dummy-C0' - match failure
Restore the max sample rate value for perf events to a reasonable value
before each test case if its value was lowered too much to ensure the
same conditions for each test case.
# 10: Setup struct perf_event_attr:
--- start ---
test child forked, pid 107222
Using CPUID 0x00000000413fd0c1
running './tests/attr/test-record-C0'
Current sample rate: 10000
running './tests/attr/test-record-basic'
Current sample rate: 800
running './tests/attr/test-record-branch-any'
Current sample rate: 700
unsupp './tests/attr/test-record-branch-any'
running './tests/attr/test-record-branch-filter-any'
Current sample rate: 10000
running './tests/attr/test-record-count'
Current sample rate: 10000
running './tests/attr/test-record-data'
Current sample rate: 600
running './tests/attr/test-record-dummy-C0'
Current sample rate: 800
running './tests/attr/test-record-freq'
Current sample rate: 10000
...
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Radostin Stoyanov <rstoyano@redhat.com>
Signed-off-by: Veronika Molnarova <vmolnaro@redhat.com>
Link: https://lore.kernel.org/r/20241003125136.15918-1-vmolnaro@redhat.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.