On 12/9/20 6:14 PM, Matthew Wilcox wrote:
> On Wed, Dec 09, 2020 at 12:24:38PM -0400, Jason Gunthorpe wrote:
>> On Wed, Dec 09, 2020 at 04:02:05PM +, Joao Martins wrote:
>>
>>> Today (without the series) struct pages are not represented the way they
>>> are expressed in the page tables,
On Wed, Dec 09, 2020 at 12:24:38PM -0400, Jason Gunthorpe wrote:
> On Wed, Dec 09, 2020 at 04:02:05PM +, Joao Martins wrote:
>
> > Today (without the series) struct pages are not represented the way they
> > are expressed in the page tables, which is what I am hoping to fix in this
> > series
On 12/9/20 4:24 PM, Jason Gunthorpe wrote:
> On Wed, Dec 09, 2020 at 04:02:05PM +, Joao Martins wrote:
>
>> Today (without the series) struct pages are not represented the way they
>> are expressed in the page tables, which is what I am hoping to fix in this
>> series thus initializing these
On 12/9/20 3:15 PM, Jason Gunthorpe wrote:
> On Wed, Dec 09, 2020 at 11:05:39AM +, Joao Martins wrote:
>>> Why is all of this special? Any time we see a PMD/PGD/etc pointing to
>>> PFN we can apply this optimization. How come device has its own
>>> special path to do this??
>>
>> I think the
On 12/9/20 4:40 AM, John Hubbard wrote:
> On 12/8/20 9:28 AM, Joao Martins wrote:
>> Much like hugetlbfs or THPs, we treat device pagemaps with
>> compound pages like the rest of GUP handling of compound pages.
>>
>> Rather than incrementing the refcount every 4K, we record
>> all sub pages and
On 12/8/20 7:49 PM, Jason Gunthorpe wrote:
> On Tue, Dec 08, 2020 at 05:28:58PM +, Joao Martins wrote:
>> Much like hugetlbfs or THPs, we treat device pagemaps with
>> compound pages like the rest of GUP handling of compound pages.
>>
>> Rather than incrementing the refcount every 4K, we
On 12/8/20 9:28 AM, Joao Martins wrote:
Much like hugetlbfs or THPs, we treat device pagemaps with
compound pages like the rest of GUP handling of compound pages.
Rather than incrementing the refcount every 4K, we record
all sub pages and increment by @refs amount *once*.
Performance measured
Much like hugetlbfs or THPs, we treat device pagemaps with
compound pages like the rest of GUP handling of compound pages.
Rather than incrementing the refcount every 4K, we record
all sub pages and increment by @refs amount *once*.
Performance measured by gup_benchmark improves considerably
