Bug#695182: [PATCH] Negative (setpoint-dirty) in bdi_position_ratio()

[paul.szabo@sydney.edu.au]

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