linux-kernel - bdi_min_ratio never shrinks, ultimately preventing valid setting of min

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Message-ID: <20110601002854.GV5753@shells.gnugeneration.com>
Date:	Tue, 31 May 2011 19:28:54 -0500
From:	lkml@...garu.com
To:	linux-kernel@...r.kernel.org
Subject: bdi_min_ratio never shrinks, ultimately preventing valid setting of min_ratio

mm/page-writeback.c
There is a static global bdi_min_ratio used for policing the setting of
per-bdi min_ratio's, to ensure the sum doesn't cross 100.

There is no place in this listing where the value is decremented by the
respective bdi's min_ratio when a bdi is torn down.  This looks like a bug
to me, and I have a situation where I'm unable to set a min_ratio to 1
where the sum of /sys/class/bdi/*/min_ratio does not add up to 100, which
is what triggered this investigation.

Regards,
Vito Caputo
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