linux-kernel - Re: [PATCH 1/2] vmscan: shrink_slab() require number of lru

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Message-ID: <alpine.DEB.2.00.1006291017480.16135@router.home>
Date:	Tue, 29 Jun 2010 10:19:37 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Minchan Kim <minchan.kim@...il.com>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH 1/2] vmscan: shrink_slab() require number of lru_pages,
  not page order

On Sun, 27 Jun 2010, Minchan Kim wrote:

> > 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.
>
> Yes. But I think it can make others confuse like this.

Right.

> Except zone_reclaim, lru_pages had been used for balancing slab
> reclaim VS page reclaim.
> So lru_page naming is a good.

It is also good to make zone reclaim more deterministic by using the new
counters. So I am not all opposed to the initial patch. Just clear things
up a bit and make sure that this does not cause regressions because of too
frequent calls to shrink_slab

> So you intentionally passed order instead of the number of lru pages
> for shrinking many slabs as possible as.

Dont remember doing that. I suspect the parameter was renamed at some
point.
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