Public bug reported:
Backport a fix for soft lockups, performance degradation, and NIC hangs
which are cause by a cgroup exit while owning a large number of inodes.
Switching the inodes to another wb results in multiple workers spinning
on the same wb->list_lock while only one worker makes progress. The fix
changes this to use a queue of inode switch work items, which is handled
by a single work item per wb. Also include a follow-up fix for a use-
after-free bug.
Verified on Grace to fix the observed soft lockups and performance
issues.
e1b849cfa6b6 writeback: Avoid contention on wb->list_lock when switching inodes
6689f01d6740 writeback: Fix use after free in inode_switch_wbs_work_fn()
** Affects: linux-nvidia-6.17 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2156922
Title:
Backport: writeback: Avoid contention on wb->list_lock when switching
inodes
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