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SubjectRe: [PATCH 01/23] tref: Implement task references.
"Eric W. Biederman" wrote:
>
> struct pid
> {
> + atomic_t count;
> /* Try to keep pid_chain in the same cacheline as nr for find_pid */
> int nr;
> struct hlist_node pid_chain;
> /* list of pids with the same nr, only one of them is in the hash */
> - struct list_head pid_list;
> - /* Does a weak reference of this type exist to the task struct? */
> - struct task_ref *tref;
> + struct list_head tasks[PIDTYPE_MAX];
> + struct rcu_head rcu;
> };
>
> ...
>
> +static void rcu_put_pid(struct rcu_head *rhp)
> +{
> + struct pid *pid = container_of(rhp, struct pid, rcu);
> + put_pid(pid);
> +}

I hope we can do it without pid->rcu and rcu_put_pid(). Hopefuly
we can use SLAB_DESTROY_BY_RCU. To do so we need some changes in
find_task_by_pid_type().

I'll try to look closer at this patch tomorrow.

Oleg.
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