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

[Chandra Seetharaman]

On Mon, 2006-09-11 at 11:02 +0400, Pavel Emelianov wrote:
<snip>

> >> In this case multithreaded apache that tries to serve each domain in
> >> separate BC will fill the memory with BC-s, held by pages allocated
> >> and mapped in threads.
> >>     
> >
> > I do not understand how the memory will be filled with BCs. Can you
> > explain, please.
> >   
> Sure. At the beginning I have one task with one BC. Then
> 1. A thread is spawned and new BC is created;

You do not have to create a new BC for each new thread, just associate
the thread to an existing appropriate BC.

> 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.
> 
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    Chandra Seetharaman               | Be careful what you choose....
              - sekharan at us.ibm.com   |      .......you may get it.
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