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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] Re: [RFC][PATCH] performance improvement for windows
	guests, running on top of virtio block device
Date: Wed, 24 Feb 2010 02:58:18 +0000
References: <1263195647.2005.44.camel@localhost>
	<20100111134733.GA27253@lst.de> <4B4B2F19.2080401@codemonkey.ws>
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To: qemu-devel@nongnu.org
Cc: Vadim Rozenfeld <vrozenfe@redhat.com>, Dor Laor <dlaor@redhat.com>, Christoph Hellwig <hch@lst.de>, Avi Kivity <avi@redhat.com>

> Bottom halves are run at the very end of the event loop which means that
> they're guaranteed to be the last thing run.  idle bottom halves can be
> rescheduled without causing an infinite loop and do not affect the
> select timeout (which normal bottom halves do).

Idle bottom halves (i.e. qemu_bh_schedule_idle) are just bugs waiting to 
happen, and should never be used for anything.

Paul