Messages in this thread | | | Subject | Re: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi | From | Peter Zijlstra <> | Date | Wed, 06 Jun 2012 17:48:40 +0200 |
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On Wed, 2012-06-06 at 08:23 -0700, Arjan van de Ven wrote: > btw TLB invalidation I think is a red herring in this discussion > (other than "global PTEs" kind of kernel pte changes); > at least on x86 this is not happening for a long time; if a CPU is > really idle (which means the CPU internally flushes the tlbs anyway), > Linux also switches to the kernel PTE set so there's no need for a flush > later on.
This is about isolation, not idle. If you share a mm across your isolation barrier you get TLB invalidates, its unavoidable. The solution is not sharing the mm -- which is a perfectly usable solution.
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