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SubjectRe: [PATCH RFC] smt nice introduces significant lock contention
Date
On Friday 02 June 2006 17:53, Nick Piggin wrote:
> This is a small micro-optimisation / cleanup we can do after
> smtnice gets converted to use trylocks. Might result in a little
> less cacheline footprint in some cases.

It's only dependent_sleeper that is being converted in these patches. The
wake_sleeping_dependent component still locks all runqueues and needs to
succeed in order to ensure a task doesn't keep sleeping indefinitely. That
one doesn't get called from schedule() so is far less expensive. This means I
don't think we can change that cpu based locking order which I believe was
introduce to prevent a deadlock (?DaveJ disovered it iirc).

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