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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Emacs in CVS plus GTK patches hogs CPU
Date: Thu, 09 Jan 2003 18:14:08 -0500
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    Yes, it is a busy wait:
    ...
    kill(17005, SIGIO)                      = 0
    gettimeofday({1042058269, 284790}, NULL) = 0
    select(8, [3 7], NULL, NULL, {0, 451252}) = 1 (in [7], left {0, 453096})

That looks like call trace output.  That rarely gives any useful
information.  How about debugging it as suggested in etc/DEBUG?