Re: unit-at-a-time...

[Andi Kleen]

> 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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