[RFC][PATCH] another swap controller for cgroup

[Daisuke Nishimura]

Daisuke Nishimura wrote:
> Hi, Yamamoto-san.
> 
> I'm reviewing and testing your patch now.
> 

In building kernel infinitely(in a cgroup of
memory.limit=64M and swap.limit=128M, with swappiness=100),
almost all of the swap (1GB) is consumed as swap cache
after a day or so.
As a result, processes are occasionally OOM-killed even when
the swap.usage of the group doesn't exceed the limit.

I don't know why the swap cache uses up swap space.
I will test whether a similar issue happens without your patch.
Do you have any thoughts?


BTW, I think that it would be better, in the sence of
isolating memory resource, if there is a framework
to limit the usage of swap cache.


Thanks,
Daisuke Nishimura.