Re: [PATCH 06/12] mm: balance active/inactive list scan rates

[Peter Zijlstra]

On Thu, 2005-12-01 at 18:18 +0800, Wu Fengguang wrote:
> plain text document attachment
> (mm-balance-active-inactive-list-aging.patch)
> shrink_zone() has two major design goals:
> 1) let active/inactive lists have equal scan rates
> 2) do the scans in small chunks
> 

> The new design:
> 1) keep perfect balance
>    let active_list follow inactive_list in scan rate
> 
> 2) always scan in SWAP_CLUSTER_MAX sized chunks
>    simple and efficient
> 
> 3) will scan at least one chunk
>    the expected behavior from the callers
> 
> The perfect balance may or may not yield better performance, though it
> a) is a more understandable and dependable behavior
> b) together with inter-zone balancing, makes the zoned memories consistent

Nice, this patch effectively separates zone balancing from
active/inactive balancing. I was thinking about doing this this morning
in order to nicely abstract out all the page-replacement code.

Thanks!




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