Messages in this thread |  | | | From | Con Kolivas <> | | Subject | Re: [PATCH RFC] smt nice introduces significant lock contention | | Date | Fri, 2 Jun 2006 18:17:46 +1000 |
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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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