On 13.04.23 15:07, David Hildenbrand wrote:
On 12.04.23 05:16, Stefan Roesch wrote:
This adds three new tests to the selftests for KSM. These tests use the new prctl API's to enable and disable KSM.
add new prctl flags to prctl header file in tools dir
This adds the new prctl flags to the include file prct.h in the tools directory. This makes sure they are available for testing.
add KSM prctl merge test
This adds the -t option to the ksm_tests program. The -t flag allows to specify if it should use madvise or prctl ksm merging.
add KSM get merge type test
This adds the -G flag to the ksm_tests program to query the KSM status with prctl after KSM has been enabled with prctl.
add KSM fork test
Add fork test to verify that the MMF_VM_MERGE_ANY flag is inherited by the child process.
add two functions for debugging merge outcome
This adds two functions to report the metrics in /proc/self/ksm_stat and /sys/kernel/debug/mm/ksm.
The debugging can be enabled with the following command line: make -C tools/testing/selftests TARGETS="mm" --keep-going \ EXTRA_CFLAGS=-DDEBUG=1
Would it make sense to instead have a "-D" (if still unused) runtime options to print this data? Dead code that's not compiled is a bit unfortunate as it can easily bit-rot.
This patch essentially does two things
- Add the option to run all tests/benchmarks with the PRCTL instead of
MADVISE
- Add some functional KSM tests for the new PRCTL (fork, enabling
works, disabling works).
The latter should rather go into ksm_functional_tests().
"tools/testing/selftests/mm/ksm_functional_tests.c" is what I wanted to say.