07115fcc15
This adds three new tests to the selftests for KSM. These tests use the new prctl API's to enable and disable KSM. 1) 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. 2) add KSM prctl merge test to ksm_tests 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. 3) add two functions for debugging merge outcome for ksm_tests This adds two functions to report the metrics in /proc/self/ksm_stat and /sys/kernel/debug/mm/ksm. The debug output is enabled with the -d option. 4) add KSM prctl test to ksm_functional_tests This adds a test to the ksm_functional_test that verifies that the prctl system call to enable / disable KSM works. 5) add KSM fork test to ksm_functional_test Add fork test to verify that the MMF_VM_MERGE_ANY flag is inherited by the child process. Link: https://lkml.kernel.org/r/20230418051342.1919757-4-shr@devkernel.io Signed-off-by: Stefan Roesch <shr@devkernel.io> Acked-by: David Hildenbrand <david@redhat.com> Cc: Bagas Sanjaya <bagasdotme@gmail.com> Cc: David Hildenbrand <david@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Rik van Riel <riel@surriel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>