From: Joonsoo Kim
Success of CMA allocation largely depends on success of migration
and key factor of it is page reference count. Until now, page reference
is manipulated by direct calling atomic functions so we cannot follow up
who and where manipulate it. Then, it is hard to find actual reason
On Mon, Nov 09 2015, Joonsoo Kim wrote:
> Success of CMA allocation largely depends on success of migration
> and key factor of it is page reference count. Until now, page reference
> is manipulated by direct calling atomic functions so we cannot follow up
> who and where manipulate it. Then, it is
On Mon, Nov 09, 2015 at 01:45:37PM +0200, Kirill A. Shutemov wrote:
> On Mon, Nov 09, 2015 at 05:00:32PM +0900, Joonsoo Kim wrote:
> > 2015-11-09 16:53 GMT+09:00 Sergey Senozhatsky
> > :
> > > Hi,
> > >
> > > On (11/09/15 16:23), Joonsoo Kim wrote:
> > > [..]
> > >> +static inline int page_count(st
On Mon, Nov 09, 2015 at 05:00:32PM +0900, Joonsoo Kim wrote:
> 2015-11-09 16:53 GMT+09:00 Sergey Senozhatsky
> :
> > Hi,
> >
> > On (11/09/15 16:23), Joonsoo Kim wrote:
> > [..]
> >> +static inline int page_count(struct page *page)
> >> +{
> >> + return atomic_read(&compound_head(page)->_count)
2015-11-09 16:53 GMT+09:00 Sergey Senozhatsky
:
> Hi,
>
> On (11/09/15 16:23), Joonsoo Kim wrote:
> [..]
>> +static inline int page_count(struct page *page)
>> +{
>> + return atomic_read(&compound_head(page)->_count);
>> +}
>> +
>> +static inline void set_page_count(struct page *page, int v)
>>
Hi,
On (11/09/15 16:23), Joonsoo Kim wrote:
[..]
> +static inline int page_count(struct page *page)
> +{
> + return atomic_read(&compound_head(page)->_count);
> +}
> +
> +static inline void set_page_count(struct page *page, int v)
> +{
> + atomic_set(&page->_count, v);
> +}
> +
> +/*
> + *
Success of CMA allocation largely depends on success of migration
and key factor of it is page reference count. Until now, page reference
is manipulated by direct calling atomic functions so we cannot follow up
who and where manipulate it. Then, it is hard to find actual reason
of CMA allocation fa
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