[Devel] Re: [PATCH v4 0/4] cgroup notifications API and memory thresholds

[Balbir Singh]

* Kirill A. Shutemov <kirill at shutemov.name> [2009-12-27 04:08:58]:

> This patchset introduces eventfd-based API for notifications in cgroups and
> implements memory notifications on top of it.
> 
> It uses statistics in memory controler to track memory usage.
> 
> Output of time(1) on building kernel on tmpfs:
> 
> Root cgroup before changes:
> 	make -j2  506.37 user 60.93s system 193% cpu 4:52.77 total
> Non-root cgroup before changes:
> 	make -j2  507.14 user 62.66s system 193% cpu 4:54.74 total
> Root cgroup after changes (0 thresholds):
> 	make -j2  507.13 user 62.20s system 193% cpu 4:53.55 total
> Non-root cgroup after changes (0 thresholds):
> 	make -j2  507.70 user 64.20s system 193% cpu 4:55.70 total
> Root cgroup after changes (1 thresholds, never crossed):
> 	make -j2  506.97 user 62.20s system 193% cpu 4:53.90 total
> Non-root cgroup after changes (1 thresholds, never crossed):
> 	make -j2  507.55 user 64.08s system 193% cpu 4:55.63 total
> 
> Any comments?

Thanks for adding the documentation, now on to more critical questions

1. Any reasons for not using cgroupstats?
2. Is there a user space test application to test this code. IIUC,
I need to write a program that uses eventfd(2) and then passes
the eventfd descriptor and thresold to cgroup.*event* file and
then the program will get notified when the threshold is reached?

-- 
	Balbir
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