Date: Wed, 4 Oct 2006 17:40:40 -0400 From: Jonathan Chen <jon@freebsd.org> To: freebsd-hackers@freebsd.org Subject: running code on all CPUs Message-ID: <20061004214040.GA6878@porthos.spock.org>
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Hello, I'm currently writing kernel code to use MCA (machine check architecture) in order to detect things like ECC errors. As part of this, I need to run code on all CPUs periodically to check some status registers. Where is the best place to do this? It doesn't seem that I can use regular kernel threads since I can't specify a CPU binding with that interface. I've thought about hooking a function call to either the beginning of idle_proc() or somewhere in mi_switch(), but neither solution seems optimal since there are no guarantees when idle_proc() is ran and mi_switch() seems like a really bad idea from a performance standpoint. Suggestions? Also, are there any locking pitfalls or other issues I should be aware of when writing code to run in either idle_proc() or mi_switch()? -Jon
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