> This flag is used to indicate to the callees that this allocation will be
> serviced to the kernel. It is not supposed to be passed by the callers
> of kmem_cache_alloc, but rather by the cache core itself.
>
Not sure what "serviced to the kernel" means, does this mean that the
memory will not be accounted for to the root memcg?
> /*
> * This may seem redundant, but it's a way of annotating false positives vs.
> * allocations that simply cannot be supported (e.g. page tables).
> */
> #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
>
> -#define __GFP_BITS_SHIFT 25 /* Room for N __GFP_FOO bits */
> +#define __GFP_BITS_SHIFT 26 /* Room for N __GFP_FOO bits */
> #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
>
> /* This equals 0, but use constants in case they ever change */
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