Re: [PATCH v1 3/3] cgroup/rstat: introduce ratelimited rstat flushing

Tejun Heo
2024-04-18T21:32:24Z

Hello,

On Thu, Apr 18, 2024 at 02:22:58PM -0700, Yosry Ahmed wrote:
> Outside of this, I think it helps us add controller-specific
> optimizations. For example, I tried to generalize the thresholding
> code in the memory controller and put it in the rstat code, but I
> couldn't really have a single value representing the "pending stats"
> from all controllers. It's impossible to compare memory stats (mostly
> in pages or bytes) to cpu time stats for instance.
>
> Similarly, with this proposal from Jesper (which I am not saying I am
> agreeing with :P), instead of having time-based ratelimiting in both
> the rstat code and the memcg code to support different thresholds, we
> could have the memory controller set a different threshold for itself.
>
> So perhaps the lock breakdowns are not enough motivation, but if we
> start generalizing optimizations in some controllers, we may want to
> split the tree for flexibility.

I see. Yeah, that makes more sense to me.

Thanks.

--
tejun