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

From: Rik van Riel
Date: Thu Dec 29 2011 - 14:32:11 EST

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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