On Thu, Aug 16, 2012 at 09:27:38PM +0200, Andrea Arcangeli wrote:
> On Thu, Aug 09, 2012 at 12:08:18PM +0300, Kirill A. Shutemov wrote:
> > + if (is_huge_zero_pmd(*pmd)) {
> > + __split_huge_zero_page_pmd(mm, pmd, address);
>
> This will work fine but it's a bit sad having to add "addr
On Fri, Aug 17, 2012 at 11:12:33AM +0300, Kirill A. Shutemov wrote:
> I've used do_huge_pmd_wp_page_fallback() as template for my code.
> What's difference between these two code paths?
> Why is do_huge_pmd_wp_page_fallback() safe?
Good point. do_huge_pmd_wp_page_fallback works only on the current
On Thu, Aug 16, 2012 at 09:27:38PM +0200, Andrea Arcangeli wrote:
> On Thu, Aug 09, 2012 at 12:08:18PM +0300, Kirill A. Shutemov wrote:
> > +static void __split_huge_zero_page_pmd(struct mm_struct *mm, pmd_t *pmd,
> > + unsigned long address)
> > +{
> > + pgtable_t pgtable;
> > + pmd_
On Thu, Aug 09, 2012 at 12:08:18PM +0300, Kirill A. Shutemov wrote:
> +static void __split_huge_zero_page_pmd(struct mm_struct *mm, pmd_t *pmd,
> + unsigned long address)
> +{
> + pgtable_t pgtable;
> + pmd_t _pmd;
> + unsigned long haddr = address & HPAGE_PMD_MASK;
> +
From: "Kirill A. Shutemov"
We can't split huge zero page itself, but we can split the pmd which
points to it.
On splitting the pmd we create a table with all ptes set to normal zero
page.
Signed-off-by: Kirill A. Shutemov
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mm/huge_memory.c | 36
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