Re: [RFC][PATCH 2/7] RSS controller core

[Pavel Emelianov <xemul@sw.ru>]

>>> Maybe you have some ideas how we can decide on this?
>> We need to work out what the requirements are before we can 
>> settle on an implementation.
> 
> Linux-VServer (and probably OpenVZ):
> 
>  - shared mappings of 'shared' files (binaries 
>    and libraries) to allow for reduced memory
>    footprint when N identical guests are running

This is done in current patches.

>  - virtual 'physical' limit should not cause
>    swap out when there are still pages left on
>    the host system (but pages of over limit guests
>    can be preferred for swapping)

So what to do when virtual physical limit is hit?
OOM-kill current task?

>  - accounting and limits have to be consistent
>    and should roughly represent the actual used
>    memory/swap (modulo optimizations, I can go
>    into detail here, if necessary)

This is true for current implementation for
booth - this patchset ang OpenVZ beancounters.

If you sum up the physpages values for all containers
you'll get the exact number of RAM pages used.

>  - OOM handling on a per guest basis, i.e. some
>    out of memory condition in guest A must not
>    affect guest B

This is done in current patches.

Herbert, did you look at the patches before
sending this mail or do you just want to
'take part' in conversation w/o understanding
of hat is going on?

> HTC,
> Herbert
> 
>> Sigh.  Who is running this show?   Anyone?
>>
>> You can actually do a form of overcommittment by allowing multiple
>> containers to share one or more of the zones. Whether that is
>> sufficient or suitable I don't know. That depends on the requirements,
>> and we haven't even discussed those, let alone agreed to them.
>>
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>