Hello, Kemeng. On Thu, Feb 08, 2024 at 05:26:10PM +0800, Kemeng Shi wrote: > Hi Tejun, sorry for the delay as I found there is a issue that keep triggering > writeback even the dirty page is under dirty background threshold. The issue > make it difficult to observe the expected improvment from this patch. I try to > fix it in [1] and test this patch based on the fix patches. > Run test as following: Ah, that looks promising and thanks a lot for looking into this. It's great to have someone actually poring over the code and behavior. Understanding the wb and cgroup wb behaviors have always been challenging because the only thing we have is the tracepoints and it's really tedious and difficult to build an overall understanding from the trace outputs. Can I persuade you into writing a drgn monitoring script similar to e.g. tools/workqueues/wq_monitor.py? I think there's a pretty good chance the visibility can be improved substantially. Thanks. -- tejun
