[PATCH 09/13] mm/powerpc: Redefine pXd_huge() with pXd_leaf()
Christophe Leroy
christophe.leroy at csgroup.eu
Thu Mar 21 04:40:39 AEDT 2024
Le 20/03/2024 à 17:09, Peter Xu a écrit :
> On Wed, Mar 20, 2024 at 06:16:43AM +0000, Christophe Leroy wrote:
>> At the first place that was to get a close fit between hardware
>> pagetable topology and linux pagetable topology. But obviously we
>> already stepped back for 512k pages, so let's go one more step aside and
>> do similar with 8M pages.
>>
>> I'll give it a try and see how it goes.
>
> So you're talking about 8M only for 8xx, am I right?
Yes I am.
>
> There seem to be other PowerPC systems use hugepd. Is it possible that we
> convert all hugepd into cont_pte form?
Indeed.
Seems like we have hugepd for book3s/64 and for nohash.
For book3s I don't know, may Aneesh can answer.
For nohash I think it should be possible because TLB misses are handled
by software. Even the e6500 which has a hardware tablewalk falls back on
software walk when it is a hugepage IIUC.
Christophe
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