Re: [RFC][PATCH 0/9] extend hugepage migration

[Simon Jeons]

Hi Michal,
On 03/21/2013 08:56 PM, Michal Hocko wrote:
> On Thu 21-03-13 07:49:48, Simon Jeons wrote:
> [...]
> > When I hacking arch/x86/mm/hugetlbpage.c like this,
> > diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
> > index ae1aa71..87f34ee 100644
> > --- a/arch/x86/mm/hugetlbpage.c
> > +++ b/arch/x86/mm/hugetlbpage.c
> > @@ -354,14 +354,13 @@ hugetlb_get_unmapped_area(struct file *file,
> > unsigned long addr,
> >
> > #endif /*HAVE_ARCH_HUGETLB_UNMAPPED_AREA*/
> >
> > -#ifdef CONFIG_X86_64
> > static __init int setup_hugepagesz(char *opt)
> > {
> > unsigned long ps = memparse(opt, &opt);
> > if (ps == PMD_SIZE) {
> > hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
> > - } else if (ps == PUD_SIZE && cpu_has_gbpages) {
> > - hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
> > + } else if (ps == PUD_SIZE) {
> > + hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT+4);
> > } else {
> > printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n",
> > ps >> 20);
> >
> > I set boot=hugepagesz=1G hugepages=10, then I got 10 32MB huge pages.
> > What's the difference between these pages which I hacking and normal
> > huge pages?
> How is this related to the patch set?
> Please _stop_ distracting discussion to unrelated topics!
>
> Nothing personal but this is just wasting our time.

Sorry kindly Michal, my bad.
Btw, could you explain this question for me? very sorry waste your time.


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