On Fri, Jan 27, 2023 at 08:52:38AM -0800, Josh Poimboeuf wrote: > On Fri, Jan 27, 2023 at 11:37:02AM +0100, Peter Zijlstra wrote: > > On Thu, Jan 26, 2023 at 08:43:55PM -0800, Josh Poimboeuf wrote: > > > Here's another idea, have we considered this? Have livepatch set > > > TIF_NEED_RESCHED on all kthreads to force them into schedule(), and then > > > have the scheduler call klp_try_switch_task() if TIF_PATCH_PENDING is > > > set. > > > > > > Not sure how scheduler folks would feel about that ;-) > > Hmmmm, with preemption I guess the above doesn't work for kthreads > calling cond_resched() instead of what vhost_worker() does (explicit > need_resched/schedule). Though I guess we could hook into cond_resched() too if we make it a non-NOP for PREEMPT+LIVEPATCH? -- Josh
