Re: SLAB_TYPESAFE_BY_RCU without constructors (was Re: [PATCH v4 13/17] khwasan: add hooks implementation)

[Dmitry Vyukov]

On Tue, Jul 31, 2018 at 7:41 PM, Eric Dumazet <edumazet@xxxxxxxxxx> wrote:
> On Tue, Jul 31, 2018 at 10:36 AM Christopher Lameter <cl@xxxxxxxxx> wrote:
>
>>
>> If there is refcounting going on then why use SLAB_TYPESAFE_BY_RCU?
>
> To allow fast reuse of objects, without going through call_rcu() and
> reducing cache efficiency.
>
> I believe this is mentioned in Documentation/RCU/rculist_nulls.txt


Is it OK to overwrite ct->status? It seems that are some read and
writes to it right after atomic_inc_not_zero.