Changes in v2 (thanks for all reviewers!): * Better error handling of invalid options. * Expose the special -1 value to reset to system default. * Add new --reset-on-fork option. * Move sched_attr.h out of include directory to avoid licensing issues. * Use pathnames.h for new procfs defines. * Use common functions to get command name and handle procfs read/write. * Remove --max option and document in help message. * Improve help message formatting. * Minor manpage tweaks. A branch of the changes is available at git clone https://github.com/qais-yousef/util-linux -b uclampset-v2 Karel, I compiled this v2 on an old Ubuntu 18.04 machine running v4.15 kernel and didn't see any compilation errors. chrt worked fine and uclampset returns EINVAL errors as expected. I don't think we need to do anything to deal with compiling against old kernel headers. Orignal cover letter ==================== Since kernel v5.3 we have a new feature called utilization clamping that allows influencing the utilization signals of a task, ultimately influencing the performance of these tasks. The series adds a new utility called uclampset that allows the user to manipulate util clamp (or uclamp for short) for existing running processes or when running a new command; in a similar spirit to how taskset and chrt currently work. Peter/Dietmar/Vincent/Patrick; reviewing the manpage (patch 3) to make sure it explains this feature right would be much appreciated. Thanks -- Qais Yousef Qais Yousef (5): Move sched_attr struct and syscall definitions into header file Add uclampset schedutil uclampset: Add man page uclampset: Plump into the build system uclampset: Plumb in bash-completion .gitignore | 1 + bash-completion/Makemodule.am | 3 + bash-completion/uclampset | 39 ++++ configure.ac | 9 + include/pathnames.h | 4 + schedutils/Makemodule.am | 7 + schedutils/chrt.c | 77 +------- schedutils/sched_attr.h | 127 +++++++++++++ schedutils/uclampset.1 | 174 ++++++++++++++++++ schedutils/uclampset.c | 337 ++++++++++++++++++++++++++++++++++ 10 files changed, 702 insertions(+), 76 deletions(-) create mode 100644 bash-completion/uclampset create mode 100644 schedutils/sched_attr.h create mode 100644 schedutils/uclampset.1 create mode 100644 schedutils/uclampset.c -- 2.25.1
