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Date: Wed, 06 Jun 2012 17:48:40 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Arjan van de Ven <arjan@...ux.intel.com> Cc: paulmck@...ux.vnet.ibm.com, Thomas Gleixner <tglx@...utronix.de>, "Luck, Tony" <tony.luck@...el.com>, "Yu, Fenghua" <fenghua.yu@...el.com>, Rusty Russell <rusty@...tcorp.com.au>, Ingo Molnar <mingo@...e.hu>, H Peter Anvin <hpa@...or.com>, "Siddha, Suresh B" <suresh.b.siddha@...el.com>, "Mallick, Asit K" <asit.k.mallick@...el.com>, linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>, linux-pm <linux-pm@...r.kernel.org>, "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com> Subject: Re: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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