Le Wed, Feb 28, 2024 at 09:14:13PM -0500, Waiman Long a écrit : > The housekeeping CPU masks, set up by the "isolcpus" and "nohz_full" > boot command line options, are used at boot time to exclude selected CPUs > from running some kernel background processes to minimize disturbance > to latency sensitive userspace applications. Some of housekeeping CPU > masks are also checked at run time to avoid using those isolated CPUs. > > The cpuset subsystem is now able to dynamically create a set of isolated > CPUs to be used in isolated cpuset partitions. The long term goal is > to make the degree of isolation as close as possible to what can be > done statically using those boot command line options. > > This patch is a step in that direction by making the housekeeping CPU > mask APIs exclude the dynamically isolated CPUs when they are called > at run time. The housekeeping CPU masks will fall back to the bootup > default when all the dynamically isolated CPUs are released. > > A new housekeeping_exlude_isolcpus() function is added which is to be > called by the cpuset subsystem to provide a list of isolated CPUs to > be excluded. Can we instead overwrite housekeeping_boot.cpumasks from cpusets entirely and forget about the original boot value forever? Thanks.
