Re: Re: memo: mem+swap controller

[kamezawa.hiroyu@jp.fujitsu.com]

>> > > Following is state transition and counter handling design memo.
>> > > This uses "3" counters to handle above conrrectly. If you have other lo
gic,
>> > > please teach me. (and blame me if my diagram is broken.)
>> > > 
>> > I don't think counting "disk swap" is good idea(global linux
>> > dosen't count it).
>> > Instead, I prefer counting "total swap"(that is swap entry).
>> > 
>> Maybe my illustration is bad. 
>> 
>> total_swap = swap_cache + disk_swap. Yes, I count swp_entry.
>> But just divides it to on-memory or not.
>> 
>> This is just a state transition problem. When we counting only total_swap,
>> we cannot avoid double counting of a swap_cache as memory and as swap.
>> 
>I agree.
>My intention was not counting only total_swap, but counting both
>total_swap and swap_cache.
>
At early stage of diaglam, I just added total_swap counter.
(total_swap here means # of used swp_entry.)
And failed to write diaglam ;( Maybe selection of counters was bad.

If just 2 counters are enough, it's better.

Hmm..
- on_memory .... # of pages used
- disk_swap      .... # of swp_entry without SwapCache

limit_in_bytes ... limits on_memory
total_limit    ... limits on_mempry + disk_swap.

can work ?

I'd like to write a sample patch in the next week.

Thanks,
-Kame




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