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

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

>From: Tristan Gingold
>Sent: 2006年4月12日 16:38
>To: Xu, Anthony; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-ia64-devel] [PATCH] [Resend]Enable hash vtlb
>
>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!
>
I assume there are collision chains :-)

>Tristan.

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