[Devel] Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added user memory)

[Pavel Emelianov]

Kirill Korotaev wrote:

[snip]
>> I have a C program that computes limits to obtain desired guarantees
>> in a single 'for (i = 0; i < n; n++)' loop for any given set of guarantees.
>> With all error handling, beautifull output, nice formatting etc it weights
>> only 60 lines.

Look at http://wiki.openvz.org/Containers/Guarantees_for_resources
I've described there how a guarantee can be get with limiting in details.

[snip]

>> I do not 'do not like guarantee'. I'm just sure that there are two ways
>> for providing guarantee (for unreclaimable resorces):
>> 1. reserving resource for group in advance
>> 2. limit resource for others
>> Reserving is worse as it is essentially limiting (you cut off 100Mb from
>> 1Gb RAM thus limiting the other groups by 900Mb RAM), but this limiting
>> is too strict - you _have_ to reserve less than RAM size. Limiting in
>> run-time is more flexible (you may create an overcommited BC if you
>> want to) and leads to the same result - guarantee.
> I think this deserves putting on Wiki.
> It is very good clear point.

This is also on the page I gave link at.