Hello, On Tue, Jul 16, 2024 at 05:01:15PM +0000, Roman Gushchin wrote: > > If we want to allow peak measurement of time periods, I wonder whether we > > could do something similar to pressure triggers - ie. let users register > > watchers so that each user can define their own watch periods. This is more > > involved but more useful and less error-inducing than adding reset to a > > single counter. > > It's definitely a better user interface and I totally agree with you regarding > the shortcomings of the proposed interface with a global reset. But if you let > users to register a (potentially large) number of watchers, it might be quite > bad for the overall performance, isn't it? To mitigate it, we'll need to reduce > the accuracy of peak values. And then the question is why not just poll it > periodically from userspace? I haven't thought in detail but it's the same problem that PSI triggers have, right? PSI seems to have found a reasonable trade-off across accuracy, overhead and usage restrictions? Maybe peak usage isn't as widely useful and it doesn't justify to engineer something as sophisticated. I don't know. Thanks. -- tejun
