On Wed, 23 Oct 2024 18:00:32 +0800 Jim Zhao <jimzhao.ai@xxxxxxxxx> wrote: > With the strictlimit flag, wb_thresh acts as a hard limit in > balance_dirty_pages() and wb_position_ratio(). When device write > operations are inactive, wb_thresh can drop to 0, causing writes to > be blocked. The issue occasionally occurs in fuse fs, particularly > with network backends, the write thread is blocked frequently during > a period. To address it, this patch raises the minimum wb_thresh to a > controllable level, similar to the non-strictlimit case. Please tell us more about the userspace-visible effects of this. It *sounds* like a serious (but occasional) problem, but that is unclear. And, very much relatedly, do you feel this fix is needed in earlier (-stable) kernels?
