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authorPeter Zijlstra <peterz@infradead.org>2024-10-10 11:38:10 +0200
committerIngo Molnar <mingo@kernel.org>2024-10-14 09:14:35 +0200
commitcd9626e9ebc77edec33023fe95dab4b04ffc819d (patch)
treef634627362f80150130afc99ccda5cf58e584614 /fs/isofs/isofs.h
parentc6508124193d42bbc3224571eb75bfa4c1821fbb (diff)
sched/fair: Fix external p->on_rq users
Sean noted that ever since commit 152e11f6df29 ("sched/fair: Implement delayed dequeue") KVM's preemption notifiers have started mis-classifying preemption vs blocking. Notably p->on_rq is no longer sufficient to determine if a task is runnable or blocked -- the aforementioned commit introduces tasks that remain on the runqueue even through they will not run again, and should be considered blocked for many cases. Add the task_is_runnable() helper to classify things and audit all external users of the p->on_rq state. Also add a few comments. Fixes: 152e11f6df29 ("sched/fair: Implement delayed dequeue") Reported-by: Sean Christopherson <seanjc@google.com> Tested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20241010091843.GK33184@noisy.programming.kicks-ass.net
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