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To: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: per-cpu blk_plug_list
References: <B05667366EE6204181EABE9C1B1C0EB501F2AB4C@scsmsx401.sc.intel.com>
From: Andi Kleen <ak@suse.de>
Date: 01 Mar 2004 23:36:44 +0100
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What happens when a process that started a plug on one CPU switches CPUs
before unplugging?

I don't see any mechanism in your patch to make sure the queue on the previous
CPU is flushed too. It could be delayed for a long time.

-Andi