Date: Mon, 1 Nov 2004 12:10:29 +0100
From: Andi Kleen <ak@suse.de>
To: Mikael Pettersson <mikpe@csd.uu.se>
Cc: ak@suse.de, linux-kernel@vger.kernel.org, pluto@pld-linux.org
Subject: Re: unit-at-a-time...
Message-ID: <20041101111029.GB24175@wotan.suse.de>
References: <200411011102.iA1B2jbX012340@harpo.it.uu.se>
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> It happened when I added perfctr to a 2.6.5-based SuSE kernel,
> and compiled the whole thing with gcc-3.4.0 (or 3.4.1, don't
> remember). Perfctr normally adds a little stack usage to the
> context-switch path, but gcc-3.4 made it much worse.
> Disabling unit-at-a-time solved the problem.

Better fix would have been a few strategic "noinline"s.
If you want noinline just say it explicitely.

Also I hope they were not all in the same callchain,
if yes you would have only hidden the problem.

-Andi
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