Messages in this thread | | | Date | Mon, 27 Jun 2022 18:31:39 +0530 | Subject | Re: [RFC PATCH 10/26] hugetlb: add for_each_hgm_shift | From | "manish.mishra" <> |
| |
On 24/06/22 11:06 pm, James Houghton wrote: > This is a helper macro to loop through all the usable page sizes for a > high-granularity-enabled HugeTLB VMA. Given the VMA's hstate, it will > loop, in descending order, through the page sizes that HugeTLB supports > for this architecture; it always includes PAGE_SIZE. reviewed-by:manish.mishra@nutanix.com > Signed-off-by: James Houghton <jthoughton@google.com> > --- > mm/hugetlb.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index 8b10b941458d..557b0afdb503 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -6989,6 +6989,16 @@ bool hugetlb_hgm_enabled(struct vm_area_struct *vma) > /* All shared VMAs have HGM enabled. */ > return vma->vm_flags & VM_SHARED; > } > +static unsigned int __shift_for_hstate(struct hstate *h) > +{ > + if (h >= &hstates[hugetlb_max_hstate]) > + return PAGE_SHIFT; > + return huge_page_shift(h); > +} > +#define for_each_hgm_shift(hstate, tmp_h, shift) \ > + for ((tmp_h) = hstate; (shift) = __shift_for_hstate(tmp_h), \ > + (tmp_h) <= &hstates[hugetlb_max_hstate]; \ > + (tmp_h)++) > #endif /* CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING */ > > /*
| |