Here is a trace of the bcache event related lock in the kernel obtained with some bpfcc-tools.
klockstat-bpfcc -c bch_ -i 5 -s 3 The trace has been run in parallel with the following command line echo "Shrinker disabled: $(date)"; sleep 60; echo "Enabling shrinker: $(date)"; echo 0 | sudo tee /sys/block/bcache0/bcache/cache/internal/btree_shrinker_disabled ; sleep 60; echo "Disabling shrinker: $(date)"; echo 1 | sudo tee /sys/block/bcache0/bcache/cache/internal/btree_shrinker_disabled; sleep 60; echo "End of test: $(date)" The log are here : https://pastebin.canonical.com/p/jVKdbV3RrK/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1898786 Title: Issue with bcache bch_mca_scan causing huge IO wait To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1898786/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
