Re: [PATCH 1/2] vmscan: shrink_slab() require number of lru_pages,not page order

[Christoph Lameter]

On Fri, 25 Jun 2010, KOSAKI Motohiro wrote:

> Fix simple argument error. Usually 'order' is very small value than
> lru_pages. then it can makes unnecessary icache dropping.

This is going to reduce the delta that is added to shrinker->nr
significantly thereby increasing the number of times that shrink_slab() is
called.

What does the "lru_pages" parameter do in shrink_slab()? Looks
like its only role is as a divison factor in a complex calculation of
pages to be scanned.

do_try_to_free_pages passes 0 as "lru_pages" to shrink_slab() when trying
to do cgroup lru scans. Why is that?


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