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

[Pavel Emelianov]

Srivatsa Vaddagiri wrote:
> On Mon, Sep 11, 2006 at 11:02:06AM +0400, Pavel Emelianov wrote:
>   
>> Sure. At the beginning I have one task with one BC. Then
>> 1. A thread is spawned and new BC is created;
>>     
>
> Why do we have to create a BC for every new thread? A new BC is needed
> for every new service level instead IMO. And typically there wont be
> unlimited service levels.
>   
That's the scenario we started from - each domain is served in a separate
BC with *threaded* Apache.
>   
>> 2. New thread touches a new page (e.g. maps a new file) which is charged
>> to new BC
>>     (and this means that this BC's must stay in memory till page is
>> uncharged);
>> 3. Thread exits after serving the request, but since it's mm is shared
>> with parent
>>     all the touched pages stay resident and, thus, the new BC is still
>> pinned in memory.
>> Steps 1-3 are done multiple times for new pages (new files).
>> Remember that we're discussing the case when pages are not recharged.
>>     
>
>
>