Re: [PATCH] mm: convert totalram_pages, totalhigh_pages and managed_pages to atomic.

Re: [PATCH] mm: convert totalram_pages, totalhigh_pages and managed_pages to atomic.

[Michal Hocko]

On Mon 22-10-18 22:53:22, Arun KS wrote:
> Remove managed_page_count_lock spinlock and instead use atomic
> variables.

I assume this has been auto-generated. If yes, it would be better to
mention the script so that people can review it and regenerate for
comparision. Such a large change is hard to review manually.
-- 
Michal Hocko
SUSE Labs

Re: [PATCH] mm: convert totalram_pages, totalhigh_pages and managed_pages to atomic.

[Arun Sudhilal]

On Mon, Oct 22, 2018 at 11:41 PM Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
>
> On Mon 22-10-18 22:53:22, Arun KS wrote:
> > Remove managed_page_count_lock spinlock and instead use atomic
> > variables.
>

Hello Michal,
> I assume this has been auto-generated. If yes, it would be better to
> mention the script so that people can review it and regenerate for
> comparision. Such a large change is hard to review manually.

Changes were made partially with script.  For totalram_pages and
totalhigh_pages,

find dir -type f -exec sed -i
's/totalram_pages/atomic_long_read(\&totalram_pages)/g' {} \;
find dir -type f -exec sed -i
's/totalhigh_pages/atomic_long_read(\&totalhigh_pages)/g' {} \;

For managed_pages it was mostly manual edits after using,
find mm/ -type f -exec sed -i
's/zone->managed_pages/atomic_long_read(\&zone->managed_pages)/g' {}
\;

Regards,
Arun

> --
> Michal Hocko
> SUSE Labs

Re: [PATCH] mm: convert totalram_pages, totalhigh_pages and managed_pages to atomic.

[Arun KS]

On 2018-10-23 09:45, Joe Perches wrote:
> On Mon, 2018-10-22 at 22:53 +0530, Arun KS wrote:
>> Remove managed_page_count_lock spinlock and instead use atomic
>> variables.
> 

Hello Joe,
> Perhaps better to define and use macros for the accesses
> instead of specific uses of atomic_long_<inc/dec/read>
> 
> Something like:
> 
> #define totalram_pages()	(unsigned 
> long)atomic_long_read(&_totalram_pages)
> #define totalram_pages_inc()	(unsigned 
> long)atomic_long_inc(&_totalram_pages)
> #define totalram_pages_dec()	(unsigned 
> long)atomic_long_dec(&_totalram_pages)

That sounds like a nice idea.

Regards,
Arun

Re: [PATCH] mm: convert totalram_pages, totalhigh_pages and managed_pages to atomic.

[Huang, Ying]

Arun KS <arunks-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> writes:

> Remove managed_page_count_lock spinlock and instead use atomic
> variables.
>
> Suggested-by: Michal Hocko <mhocko-IBi9RG/b67k@public.gmane.org>
> Suggested-by: Vlastimil Babka <vbabka-AlSwsSmVLrQ@public.gmane.org>
> Signed-off-by: Arun KS <arunks-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
>
> ---
> As discussed here,
> https://patchwork.kernel.org/patch/10627521/#22261253

My 2 cents.  I think you should include at least part of the discussion
in the patch description to make it more readable by itself.

Best Regards,
Huang, Ying