On Mon, Nov 23, 2020 at 3:00 AM Matthew Wilcox wrote:
>
> On Fri, Nov 20, 2020 at 09:25:52AM +0100, Michal Hocko wrote:
> > On Fri 20-11-20 14:43:25, Muchun Song wrote:
> > > We only can free the unused vmemmap to the buddy system when the
> > > size of struct page is a power of two.
> >
> > Can
On Fri, Nov 20, 2020 at 09:25:52AM +0100, Michal Hocko wrote:
> On Fri 20-11-20 14:43:25, Muchun Song wrote:
> > We only can free the unused vmemmap to the buddy system when the
> > size of struct page is a power of two.
>
> Can we actually have !power_of_2 struct pages?
Yes. On x86-64, if you
On Fri, Nov 20, 2020 at 10:15:30AM +0100, David Hildenbrand wrote:
> On 20.11.20 09:25, Michal Hocko wrote:
> > On Fri 20-11-20 14:43:25, Muchun Song wrote:
> > > We only can free the unused vmemmap to the buddy system when the
> > > size of struct page is a power of two.
> >
> > Can we actually
On Fri, Nov 20, 2020 at 5:16 PM David Hildenbrand wrote:
>
> On 20.11.20 07:43, Muchun Song wrote:
> > We only can free the unused vmemmap to the buddy system when the
> > size of struct page is a power of two.
> >
> > Signed-off-by: Muchun Song
> > ---
> > mm/hugetlb_vmemmap.c | 3 ++-
> > 1
On 20.11.20 07:43, Muchun Song wrote:
We only can free the unused vmemmap to the buddy system when the
size of struct page is a power of two.
Signed-off-by: Muchun Song
---
mm/hugetlb_vmemmap.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/hugetlb_vmemmap.c
On 20.11.20 09:25, Michal Hocko wrote:
On Fri 20-11-20 14:43:25, Muchun Song wrote:
We only can free the unused vmemmap to the buddy system when the
size of struct page is a power of two.
Can we actually have !power_of_2 struct pages?
AFAIK multiples of 8 bytes (56, 64, 72) are possible.
On Fri 20-11-20 14:43:25, Muchun Song wrote:
> We only can free the unused vmemmap to the buddy system when the
> size of struct page is a power of two.
Can we actually have !power_of_2 struct pages?
>
> Signed-off-by: Muchun Song
> ---
> mm/hugetlb_vmemmap.c | 3 ++-
> 1 file changed, 2
We only can free the unused vmemmap to the buddy system when the
size of struct page is a power of two.
Signed-off-by: Muchun Song
---
mm/hugetlb_vmemmap.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
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