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Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added user memory) [message #6222 is a reply to message #6221] Tue, 12 September 2006 10:29 Go to previous messageGo to previous message
Srivatsa Vaddagiri is currently offline  Srivatsa Vaddagiri
Messages: 241
Registered: August 2006
Senior Member
On Tue, Sep 12, 2006 at 02:24:25PM +0400, Pavel Emelianov wrote:
> 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.

Sure ..but you can still meet that requirement by creating fixed set of
BCs (for each domain) and let each new thread be associated with a
corresponding BC (w/o requiring to create BC for every new thread),
depending on which domain's request it is serving?

> >
> >> 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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--
Regards,
vatsa
 
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