[PATCH 00/10] cgroups: Task counter subsystem v6
Glauber Costa
glommer at parallels.com
Thu Nov 3 17:35:46 UTC 2011
On 11/03/2011 03:28 PM, Paul Menage wrote:
> On Thu, Nov 3, 2011 at 10:06 AM, Glauber Costa<glommer at parallels.com> wrote:
>> Sorry if I wasn't clear: It removes the need to walk multiple independent
>> hierarchies. The walk is done only once.
>
> You're talking about at fork time, and the concern is the cache
> footprint involved in walking up the parent pointer chain?
Yes, we can say this is my main concern.
> Isn't that an argument against multiple hierarchies (which is a
> decision for the admin), rather than against more subsystem
> flexibility?
Not always it is a decision for the admin. In most cases, it is a
constraint of the problem. For containers - take lxc as an example,
the most reasonable thing to do is to grab all cgroups subsystems
available, and contain them.
> If multiple subsystems on the same hierarchy each need to
> walk up the pointer chain on the same event, then after the first
> subsystem has done so the chain will be in cache for any subsequent
> walks from other subsystems.
No, it won't. Precisely because different subsystems have completely
independent pointer chains.
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