Re: [PATCH v9 09/15] x86/sgx: Charge mem_cgroup for per-cgroup reclamation

[Dave Hansen]

On 2/5/24 13:06, Haitao Huang wrote:
>  static struct mem_cgroup *sgx_encl_get_mem_cgroup(struct sgx_encl *encl)
>  {
> @@ -1003,14 +1001,6 @@ static struct mem_cgroup *sgx_encl_get_mem_cgroup(struct sgx_encl *encl)
>  	struct sgx_encl_mm *encl_mm;
>  	int idx;
>  
> -	/*
> -	 * If called from normal task context, return the mem_cgroup
> -	 * of the current task's mm. The remainder of the handling is for
> -	 * ksgxd.
> -	 */
> -	if (!current_is_ksgxd())
> -		return get_mem_cgroup_from_mm(current->mm);

Why is this being removed?

Searching the enclave mm list is a last resort.  It's expensive and
imprecise.

get_mem_cgroup_from_mm(current->mm), on the other hand is fast and precise.