linux-kernel - Re: [PATCH] Negative (setpoint-dirty) in bdi_position

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Message-Id: <201301260357.r0Q3vT1v005715@como.maths.usyd.edu.au>
Date:	Sat, 26 Jan 2013 14:57:29 +1100
From:	paul.szabo@...ney.edu.au
To:	fengguang.wu@...el.com
Cc:	695182@...s.debian.org, akpm@...ux-foundation.org, jack@...e.cz,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] Negative (setpoint-dirty) in bdi_position_ratio()

Dear Fengguang (et al),

> There are 260MB reclaimable slab pages in the normal zone, however we
> somehow failed to reclaim them. ...

Could the problem be that without CONFIG_NUMA, zone_reclaim_mode stays
at zero and anyway zone_reclaim() does nothing in include/linux/swap.h ?

Though... there is no CONFIG_NUMA nor /proc/sys/vm/zone_reclaim_mode in
the Ubuntu non-PAE "plain" HIGHMEM4G kernel, and still it handles the
"sleep test" just fine.

Where does reclaiming happen (or meant to happen)?

Thanks, Paul

Paul Szabo   psz@...hs.usyd.edu.au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia
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