This series improves libaio engine support for IO priority, adding options to allow for mixed priority workloads to be specified more easily and to match the kernel supported IO priority features. The first 3 patches are small cleanup and fixes in the manpage and fiograph tool. Patch 4 and 5 introduce some helper functions to simplify the code in the followup patches. Patch 6 changes the cmdprio_percentage option to allow specifying different percentages for reads and writes. Patch 7 and 8 introduce the aioprioclass, aioprio and aioprio_bssplit. These together allow a script to specify different IO priorities for reads and writes of different sizes with different percentages. Patch 9 relaxes restrictions on the cmdprio_percentage option to allow jobs to execute AIOs using a default priority as set with ioprio_set() (as the kernel supports this). Patch 10 introduces the log_prio option to log each IO priority value, allowing users to do per-priority level performance analysis with complex workloads using many jobs. Finally, patch 11 adds a couple of example scripts to illustrate the use of the new options introduced. Comments are as always most welcome. Damien Le Moal (11): manpage: fix formatting manpage: fix definition of prio and prioclass options tools: fiograph: do not overwrite input script file os: introduce ioprio_value() helper options: make parsing functions available to ioengines libaio,io_uring: improve cmdprio_percentage option libaio: introduce aioprio and aioprioclass options libaio: introduce aioprio_bssplit libaio: relax cdmprio_percentage constraints fio: Introduce the log_prio option examples: add libaio priority use examples HOWTO | 57 +++++++-- backend.c | 1 + cconv.c | 2 + client.c | 2 + engines/filecreate.c | 2 +- engines/filedelete.c | 2 +- engines/filestat.c | 2 +- engines/io_uring.c | 33 +++-- engines/libaio.c | 210 ++++++++++++++++++++++++++++--- eta.c | 2 +- examples/aio-prio-bssplit.fio | 17 +++ examples/aio-prio-bssplit.png | Bin 0 -> 48709 bytes examples/aio-prio-percentage.fio | 17 +++ examples/aio-prio-percentage.png | Bin 0 -> 48752 bytes fio.1 | 76 ++++++++--- fio.h | 5 + init.c | 4 + io_u.c | 14 ++- io_u.h | 10 +- iolog.c | 45 +++++-- iolog.h | 16 ++- options.c | 50 ++++---- os/os-android.h | 24 ++-- os/os-dragonfly.h | 1 + os/os-linux.h | 24 ++-- os/os.h | 4 + server.h | 3 +- stat.c | 75 +++++------ stat.h | 9 +- thread_options.h | 20 +++ tools/fiograph/fiograph.conf | 4 +- tools/fiograph/fiograph.py | 4 +- 32 files changed, 574 insertions(+), 161 deletions(-) create mode 100644 examples/aio-prio-bssplit.fio create mode 100644 examples/aio-prio-bssplit.png create mode 100644 examples/aio-prio-percentage.fio create mode 100644 examples/aio-prio-percentage.png -- 2.31.1
