From: Andrew Morton <akpm@zip.com.au>
To: Ed Tomlinson <tomlins@cam.org>
Cc: linux-mm@kvack.org
Subject: Re: Fwd: Re: slablru for 2.5.32-mm1
Date: Mon, 02 Sep 2002 13:02:11 -0700 [thread overview]
Message-ID: <3D73C3C3.B48FE419@zip.com.au> (raw)
In-Reply-To: 200209021137.41132.tomlins@cam.org
Ed Tomlinson wrote:
>
> ...
> The pages which back slab objects may be manually marked as referenced
> via kmem_touch_page(), which simply sets PG_referenced. It _could_ use
> mark_page_accessed(), but doesn't. So slab pages will always remain on
> the inactive list.
>
> --
> Since shrinking a slab is a much lower cost operation than a swap we keep
> the slab pages in inactive where they age faster. Note I did test with slabs
> following the normal active/inactive cycle - we swapped more.
> --
It worries me that we may be keeping a large number of unfreeable
slab pages on the inactive list. These will churn around creating
extra work, but more significantly they will revent refill_inactive
from bringing down really-reclaimable pages.
> ...
> Actually the BUG_ON conversion were done by Craig Kulesa. It would be a
> good idea to credit him with the initial port to 2.5 - he did to the work.
OK.
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next prev parent reply other threads:[~2002-09-02 20:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-02 15:37 Fwd: Re: slablru for 2.5.32-mm1 Ed Tomlinson
2002-09-02 20:02 ` Andrew Morton [this message]
2002-09-02 22:49 ` Ed Tomlinson
-- strict thread matches above, loose matches on Subject: below --
2002-09-02 15:38 Ed Tomlinson
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