Re: [PATCH] MIPS: make userspace mapping young by default

Thomas Bogendoerfer
2021-02-04T10:37:30Z

On Thu, Feb 04, 2021 at 01:29:26PM +1000, Nicholas Piggin wrote:
> Excerpts from Huang Pei's message of February 4, 2021 11:39 am:
> > MIPS page fault path(except huge page) takes 3 exceptions (1 TLB Miss
> > + 2 TLB Invalid), butthe second TLB Invalid exception is just
> > triggered by __update_tlb from do_page_fault writing tlb without
> > _PAGE_VALID set. With this patch, user space mapping prot is made
> > young by default (with both _PAGE_VALID and _PAGE_YOUNG set),
> > and it only take 1 TLB Miss + 1 TLB Invalid exception
> >
> > Remove pte_sw_mkyoung without polluting MM code and make page fault
> > delay of MIPS on par with other architecture
> >
> > Signed-off-by: Huang Pei <huangpei@loongson.cn>
>
> Could we merge this? For the core code,

sure, but IMHO I should only merge the MIPS part, correct ?

Thomas.

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