Re: [PATCH v5 0/4] cgroup notifications API and memory thresholds

[Balbir Singh <balbir@linux.vnet.ibm.com>]

* Kirill A. Shutemov <kirill@shutemov.name> [2009-12-30 17:57:55]:

> 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?

Hi,

I just saw that the notification work for me using the tool you
supplied. One strange thing was that I got notified even though
the amount of data I was using was reducing, so I hit the notification
two ways

        +------------+-----------
                    1G
                ----> (got notified on increase)
                <---- (got notified on decrease)

I am not against the behaviour, but it can be confusing unless
clarified with the event.

-- 
	Balbir