Re: [PATCH 3/3] mm: remove unnecessary uses of lock_page_memcg()

[Vladimir Davydov]

On Fri, Jan 29, 2016 at 06:19:33PM -0500, Johannes Weiner wrote:
> There are several users that nest lock_page_memcg() inside lock_page()
> to prevent page->mem_cgroup from changing. But the page lock prevents
> pages from moving between cgroups, so that is unnecessary overhead.
> 
> Remove lock_page_memcg() in contexts with locked contexts and fix the
> debug code in the page stat functions to be okay with the page lock.
> 
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>

Acked-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>