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Date: Sat, 12 Nov 2011 18:37:35 -0800 From: Arjan van de Ven <arjan@...radead.org> To: Xin Tong <xerox.time.tech@...il.com> Cc: linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: INVLPG Instruction On Sat, 12 Nov 2011 19:59:44 -0500 Xin Tong <xerox.time.tech@...il.com> wrote: > Hello > > When a process has a page fault and Linux swaps out a page ( no more > free page ) from another process and give it to the page-faulting > process. Typically a INVLPG is used to invalidate entries in the TLB. > I would like to know whether INVLPG is global ( i.e. across all cores > )? How does the process which Linux stole the page from get informed ( > how is its tlb invalidated) ? invlpg is not "global" in the way you mean it (nor in the sense of "global pte's"). The kernel will do an IPI to the processors that have a possibility to have this page in the TLB and do a local flush there. -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org -- 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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