On 11/03/2011 03:28 PM, Paul Menage wrote:
On Thu, Nov 3, 2011 at 10:06 AM, Glauber Costa<glommer@xxxxxxxxxxxxx> 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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