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56cc24f59c
With previous modification to delay freeing policy data after an RCU grace period, prfill() can run under RCU instead of taking queue_lock. However, policy teardown can still clear blkg->pd[plid] after blkcg_print_blkgs() observes the policy enabled bit. Load policy data once with READ_ONCE() and skip the blkg if teardown already cleared it. Do the same in recursive stat walks for descendant blkgs. Remove the stale BFQ debug queue_lock assertion because blkcg_print_blkgs() no longer calls prfill() with queue_lock held. This also lets ioc_qos_prfill() and ioc_cost_model_prfill() use IRQ-safe ioc->lock locking without re-enabling IRQs while queue_lock is still held. Signed-off-by: Yu Kuai <yukuai@fygo.io> Link: https://patch.msgid.link/db7633d5e263dd1c2bf9b901762545a84b7d714e.1780621988.git.yukuai@fygo.io Signed-off-by: Jens Axboe <axboe@kernel.dk>
3610 lines
101 KiB
3610 lines
101 KiB