Re: [Xen-ia64-devel] [PATCH][RFC] tlb insert tracking

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Vendredi 14 Juillet 2006 08:47, Isaku Yamahata a écrit :
> Hi all.
> This patch is for comment, review and evaluation. not for commit.
> This patch isn't completed yet.
> xen_ia64_tlb_track=y compile time option is added.
>
> On VP model a page is removed from a domain, Xen/IA64 flushes vTLB
> to prevent a domain from accessing the removed page
> accidentaly or maliciously. However whole vTLB flush cost is very high.
> With this patch, Xen/IA64 tries to track tlb insertion of granted
> page. If Xen/IA64 tracks virtual address when a granted page is
> unmapped from a foreign page and, then xen/ia64 flushes only
> one virtual address instead of whole vTLB flush.

Hi,

sorry for my late reply.
I have quickly read the patch.  I think it is a good idea to work on this 
performance issue.  It seems x86 people are also trying to improve
tlb flush for granted table when shadow mode is enabled.

I don't have comments other than encouragements!

Tristan.

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