On Mon, Jul 07, 2025 at 03:44:30PM +0800, Ming Lei wrote: > On Wed, Jul 02, 2025 at 06:33:59PM +0200, Daniel Wagner wrote: > > When isolcpus=io_queue is enabled, and the last housekeeping CPU for a > > given hctx goes offline, there would be no CPU left to handle I/O. To > > prevent I/O stalls, prevent offlining housekeeping CPUs that are still > > serving isolated CPUs. > > > > When isolcpus=io_queue is enabled and the last housekeeping CPU > > for a given hctx goes offline, no CPU would be left to handle I/O. > > To prevent I/O stalls, disallow offlining housekeeping CPUs that are > > still serving isolated CPUs. > > If you do so, cpu offline is failed, and this change is user visible, please > document the cpu offline failure limit on Documentation/admin-guide/kernel-parameters.txt. > in the next patch. > > Thanks, > Ming +1 -- Aaron Tomlin
