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Date: Wed, 4 Feb 2015 12:47:05 -0500 From: Luiz Capitulino <lcapitulino@...hat.com> To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Naoya Horiguchi <n-horiguchi@...jp.nec.com>, Andi Kleen <ak@...ux.intel.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com> Subject: Re: [PATCH] hugetlb, x86: register 1G page size if we can allocate them runtime On Wed, 4 Feb 2015 13:54:31 +0200 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> wrote: > After commit 944d9fec8d7a we can allocate 1G pages runtime if CMA is > enabled. > > Let's register 1G pages into hugetlb even if user hasn't requested them > explicitly at boot time with hugepagesz=1G. > > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> > Cc: Luiz Capitulino <lcapitulino@...hat.com> > Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com> > Cc: Andi Kleen <ak@...ux.intel.com> > Cc: Thomas Gleixner <tglx@...utronix.de> > Cc: Ingo Molnar <mingo@...hat.com> > Cc: "H. Peter Anvin" <hpa@...or.com> > --- > arch/x86/mm/hugetlbpage.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c > index 9161f764121e..42982b26e32b 100644 > --- a/arch/x86/mm/hugetlbpage.c > +++ b/arch/x86/mm/hugetlbpage.c > @@ -172,4 +172,15 @@ static __init int setup_hugepagesz(char *opt) > return 1; > } > __setup("hugepagesz=", setup_hugepagesz); > + > +#ifdef CONFIG_CMA > +static __init int gigantic_pages_init(void) > +{ > + /* With CMA we can allocate gigantic pages at runtime */ > + if (cpu_has_gbpages && !size_to_hstate(1UL << PUD_SHIFT)) > + hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); > + return 0; > +} > +arch_initcall(gigantic_pages_init); > +#endif > #endif Very nice! I was thinking about this for a long time but I don't think my implementation would be that simple: Reviewed-by: Luiz Capitulino <lcapitulino@...hat.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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