On Wed, 2011-03-09 at 15:36 +0000, Catalin Marinas wrote:
> On Wed, 2011-03-09 at 15:19 +0000, Peter Zijlstra wrote:
> > On Wed, 2011-03-09 at 15:16 +0000, Catalin Marinas wrote:
> > > Hi Peter,
> > >
> > > On 2 March 2011 17:59, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:
> > > > --- linux-2.6.orig/arch/arm/include/asm/tlb.h
> > > > +++ linux-2.6/arch/arm/include/asm/tlb.h
> > > [...]
> > > > +__pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, unsigned long addr)
> > > > {
> > > > pgtable_page_dtor(pte);
> > > > - tlb_add_flush(tlb, addr);
> > > > tlb_remove_page(tlb, pte);
> > > > }
> > >
> > > I think we still need a tlb_track_range() call here. On the path to
> > > pte_free_tlb() (for example shift_arg_pages ... free_pte_range) there
> > > doesn't seem to be any code setting the tlb->start/end range. Did I
> > > miss anything?
> >
> > Patch 3 included:
> >
> > -#define pte_free_tlb(tlb, ptep, address) \
> > - do { \
> > - tlb->need_flush = 1; \
> > - __pte_free_tlb(tlb, ptep, address); \
> > +#define pte_free_tlb(tlb, ptep, address) \
> > + do { \
> > + tlb->need_flush = 1; \
> > + tlb_track_range(tlb, address, pmd_addr_end(address, TASK_SIZE));\
> > + __pte_free_tlb(tlb, ptep, address); \
> > } while (0)
>
> OK, so the range is tracked. The only issue is that for platforms with a
> folded pmd the range end would go to TASK_SIZE. In this case
> pgd_addr_end() would make more sense (or something like
> PTRS_PER_PTE*PAGE_SIZE).
Urgh, so when pmds are folded pmd_addr_end() doesn't get to be the next
biggest thing? PTRS_PER_PTE*PAGE_SIZE like things don't work since
there is no guarantee addr is at the beginning of the pmd.
Ok, will try and sort that out.
--
To unsubscribe from this list: send the line "unsubscribe linux-arch" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
