linux-kernel - Re: [PATCH v2 2/2] vmscan: shrink_slab() require number of lru

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Date:	Thu, 8 Jul 2010 16:01:48 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Mel Gorman <mel@....ul.ie>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v2 2/2] vmscan: shrink_slab() require number of lru_pages,
 not page order

On Thu, 8 Jul 2010, Andrew Morton wrote:

> > AFAICT this is not argument error but someone changed the naming of the
> > parameter.
>
> It's been there since day zero:
>
> : commit 2a16e3f4b0c408b9e50297d2ec27e295d490267a
> : Author:     Christoph Lameter <clameter@...r.sgi.com>
> : AuthorDate: Wed Feb 1 03:05:35 2006 -0800
> : Commit:     Linus Torvalds <torvalds@...osdl.org>
> : CommitDate: Wed Feb 1 08:53:16 2006 -0800
> :
> :     [PATCH] Reclaim slab during zone reclaim

That only shows that the order parameter was passed to shrink_slab() which
is what I remember being done intentionally.

Vaguely recall that this was necessary to avoid shrink_slab() throwing out
too many pages for higher order allocs.

Initially zone_reclaim was full of heuristics that later were replaced by
counter as the new ZVCs became available and gradually better ways of
accounting for pages became possible.



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