On Wed, Sep 16, 2020 at 06:12:37PM -0700, Shakeel Butt wrote: > On Thu, Sep 10, 2020 at 1:27 PM Roman Gushchin <guro@xxxxxx> wrote: > > > > To gather all direct accesses to struct page's memcg_data field > > in one place, let's introduce 4 new helper functions to use in > > the slab accounting code: > > struct obj_cgroup **page_obj_cgroups(struct page *page); > > struct obj_cgroup **page_obj_cgroups_check(struct page *page); > > bool set_page_obj_cgroups(struct page *page, struct obj_cgroup **objcgs); > > void clear_page_obj_cgroups(struct page *page); > > > > They are similar to the corresponding API for generic pages, except > > that the setter can return false, indicating that the value has been > > already set from a different thread. > > > > Signed-off-by: Roman Gushchin <guro@xxxxxx> > > Nit below. > > Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx> > > > --- > > include/linux/memcontrol.h | 48 ++++++++++++++++++++++++++++++++++++++ > > mm/memcontrol.c | 4 ++-- > > mm/slab.h | 27 +++------------------ > > 3 files changed, 53 insertions(+), 26 deletions(-) > > > > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h > > index 0997220c84ce..48d4c2c1ce81 100644 > > --- a/include/linux/memcontrol.h > > +++ b/include/linux/memcontrol.h > > @@ -375,6 +375,54 @@ static inline void clear_page_mem_cgroup(struct page *page) > > page->memcg_data = 0; > > } > > > > I think adding comments on these functions would be helpful. I agree, will add. Thank you for taking a look! Roman