On 15/08/2025 14:54, Usama Arif wrote: > The test will set the global system THP setting to never, madvise > or always depending on the fixture variant and the 2M setting to > inherit before it starts (and reset to original at teardown). > The fixture setup will also test if PR_SET_THP_DISABLE prctl call can > be made with PR_THP_DISABLE_EXCEPT_ADVISED and skip if it fails. > > This tests if the process can: > - successfully get the policy to disable THPs expect for madvise. > - get hugepages only on MADV_HUGE and MADV_COLLAPSE if the global policy > is madvise/always and only with MADV_COLLAPSE if the global policy is > never. > - successfully reset the policy of the process. > - after reset, only get hugepages with: > - MADV_COLLAPSE when policy is set to never. > - MADV_HUGE and MADV_COLLAPSE when policy is set to madvise. > - always when policy is set to "always". > - never get a THP with MADV_NOHUGEPAGE. > - repeat the above tests in a forked process to make sure the policy is > carried across forks. > > Test results: > ./prctl_thp_disable > TAP version 13 > 1..12 > ok 1 prctl_thp_disable_completely.never.nofork > ok 2 prctl_thp_disable_completely.never.fork > ok 3 prctl_thp_disable_completely.madvise.nofork > ok 4 prctl_thp_disable_completely.madvise.fork > ok 5 prctl_thp_disable_completely.always.nofork > ok 6 prctl_thp_disable_completely.always.fork > ok 7 prctl_thp_disable_except_madvise.never.nofork > ok 8 prctl_thp_disable_except_madvise.never.fork > ok 9 prctl_thp_disable_except_madvise.madvise.nofork > ok 10 prctl_thp_disable_except_madvise.madvise.fork > ok 11 prctl_thp_disable_except_madvise.always.nofork > ok 12 prctl_thp_disable_except_madvise.always.fork > > Signed-off-by: Usama Arif <usamaarif642@xxxxxxxxx> > --- Andrew could you please help apply the below fixlet on top of this patch? Thanks!
