On 5/18/22 2:43 PM, Suren Baghdasaryan wrote:
Introduce process_mrelease syscall sanity tests which include tests which expect to fail: - process_mrelease with invalid pidfd and flags inputs - process_mrelease on a live process with no pending signals and valid process_mrelease usage which is expected to succeed. Because process_mrelease has to be used against a process with a pending SIGKILL, it's possible that the process exits before process_mrelease gets called. In such cases we retry the test with a victim that allocates twice more memory up to 1GB. This would require the victim process to spend more time during exit and process_mrelease has a better chance of catching the process before it exits and succeeding. On success the test reports the amount of memory the child had to allocate for reaping to succeed. Sample output: $ mrelease_test Success reaping a child with 1MB of memory allocations On failure the test reports the failure. Sample outputs: $ mrelease_test All process_mrelease attempts failed! $ mrelease_test process_mrelease: Invalid argument Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx> --- Changes in v3: - Applied on git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm mm-stable, per Andrew - Fixed formatting for sample outputs in the description, per Shuah - Removed pidfd_open, process_mrelease, write_fault_pages functions, per Shuah - Moved child main routine into its own function, per Shuah - Followed tools/testing/selftests/pidfd/pidfd.h as a model to deal with undefined syscall numbers, per Shuah
Looks good to me Suren. Thank you. Reviewed-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> thanks, -- Shuah
