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4c2a20413d
Add a new is_blocked flag to the task struct. This flag is set by try_to_block_task() and cleared by ttwu_do_wakeup() and tracks if the task is blocked. Traditionally this would mirror !p->on_rq, however due things like DELAY_DEQUEUE and PROXY_EXEC, this can diverge, so its useful to manage separately. Additionally with this, we might be able to get rid of the p->se.sched_delayed (ab)use in the core code (eventually). Taken whole cloth from Peter's email: https://lore.kernel.org/lkml/20260501132143.GC1026330@noisy.programming.kicks-ass.net/ With a few additional p->is_blocked = 0 in a few cases where we return current if blocked_on gets zeroed or there is no owner. This may hint that these current special cases might be dropped eventually. This change also helps resolve wait-queue stalls seen with proxy-execution. See previous patch attempts for details: https://lore.kernel.org/lkml/20260430215103.2978955-2-jstultz@google.com/ Reported-by: Vineeth Pillai <vineethrp@google.com> Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: John Stultz <jstultz@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://patch.msgid.link/20260512025635.2840817-7-jstultz@google.com