Re: [PATCH 11/11] mm: Isolate pages for immediate reclaim on theirown LRU

[Rik van Riel]

On 12/29/2011 11:59 AM, Mel Gorman wrote:

> I considered a few ways of fixing this. The obvious one is to add a
> new page flag but that is difficult to justify as the high-cpu-usage
> problem should only occur when there is a lot of writeback to slow
> storage which I believe is a rare case. It is not a suitable use for
> an extended page flag.

Actually, don't we already have three LRU related
bits in the page flags?

We could stop using those as bit flags, and use
them as a number instead. That way we could encode
up to 7 or 8 (depending on how we use all-zeroes)
LRU lists with the number of bits we have now.

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