This series makes it possible for purecap apps to use the aio_ring shared memory region to bypass the io_getevents syscall's overhead. This functionality is also used in libaio.
With these patches, all io_* LTP tests pass in both Purecap and plain AArch64 modes. Note that the LTP tests only address the basic functionality of the aio system and a significant portion of the functionality is untested in LTP.
For a more comprehensive testing, libaio has been updated with the new uAPI and ported. All the tests in libaio pass accordingly, in both Purecap and plain AArch64 modes.
Gitlab issue: https://git.morello-project.org/morello/kernel/linux/-/issues/49
Review branch: https://git.morello-project.org/tudcre01/linux/-/commits/morello/aio_v1
Tudor Cretu (4): aio: Fix the relationship between ctx pages and io_events array aio: Implement compat handling for the io_event struct aio: Allow capability tag access on the shared memory aio: Use user pointer type in the io_event struct and aio_context_t
fs/aio.c | 197 ++++++++++++++++++++++++++--------- include/uapi/linux/aio_abi.h | 12 +-- 2 files changed, 153 insertions(+), 56 deletions(-)