Re: [Xen-ia64-devel] [PATCH] [Resend]Enable hash vtlb

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Mercredi 12 Avril 2006 10:01, Xu, Anthony a écrit :
> From: Tristan Gingold [mailto:Tristan.Gingold@xxxxxxxx]
>
> >Sent: 2006年4月12日 15:53
> >To: Xu, Anthony; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >Subject: Re: [Xen-ia64-devel] [PATCH] [Resend]Enable hash vtlb
> >
> >Le Vendredi 07 Avril 2006 21:02, Xu, Anthony a écrit :
> >> Hash vTLB is intended to address SMP scalability for large system.
> >
> >If I understand correctly, the Hash vTLB patch doesn't handle itc whose ps
> > > rr.ps (there is a panic here).
>
> Correct, Hash vTLB doesn't handle multiple page sizes on the same region.
> Linux doesn't use multiple page sizes on the same region.
> Linux uses region 4 to handle hugetlb like 256M, rr4.ps is set to 256M.
>
> >After a few minutes of thinking, I don't see how this could be done.
> >Any hint ?
>
> Break this huge tlb into several small tlbs whose page size is equal to
> rr.ps.
I am not sure this works.  During insertion an entry can erase another entry 
from the same itc.  And if a fault occurs within the erased entry, there is 
no forward progression!

Tristan.

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