Re: [PATCH] block: Fix LSF default inconsistency

[Rik van Riel]

Hugh Dickins wrote:
> On Sat, 13 Dec 2008, KOSAKI Motohiro wrote:
>   
> > To move mlocked file cache page to unevictable list is useful although
> > swapless embedded device.
> >     
>
> Yes, I don't understand why Rik suggested CONFIG_SWAP for it either.
On swapless systems (with CONFIG_SWAP=n), we never scan
the anon lists, so we do not need to split out the mlocked pages from
the anon pages.

On a system with swap, we want to split out the mlocked pages
so that scan balancing always works right.  So whenever
CONFIG_SWAP is on, we want CONFIG_UNEVICTABLE_LRU
to be on as well.

That means we can replace CONFIG_UNEVICTABLE_LRU
with CONFIG_SWAP throughout the code, and get a kernel
with the desired behaviour either way.


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