Re: [PATCH v4 1/3] mm: memcg/slab: Properly set up gfp flags for objcg pointer array

[Roman Gushchin]

On Wed, May 05, 2021 at 04:06:08PM -0400, Waiman Long wrote:
> Since the merging of the new slab memory controller in v5.9, the page
> structure may store a pointer to obj_cgroup pointer array for slab pages.
> Currently, only the __GFP_ACCOUNT bit is masked off. However, the array
> is not readily reclaimable and doesn't need to come from the DMA buffer.
> So those GFP bits should be masked off as well.
> 
> Do the flag bit clearing at memcg_alloc_page_obj_cgroups() to make sure
> that it is consistently applied no matter where it is called.
> 
> Fixes: 286e04b8ed7a ("mm: memcg/slab: allocate obj_cgroups for non-root slab pages")
> Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
> Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>

Acked-by: Roman Gushchin <guro@xxxxxx>