Re: [PATCH] task_work: remove fifo ordering guarantee

From: Oleg Nesterov
Date: Sat Aug 29 2015 - 08:57:00 EST

On 08/29, Ingo Molnar wrote:
> So I'm wondering, is there any strong reason why we couldn't use a double linked
> list and still do FIFO and remove that silly linear list walking hack?

This will obviously enlarge callback_head, and it is often embedded.
But this is minor.

If we use a double linked list we can't do task_work_add() lockless.
So we will need another spinlock_t in task_struct. We can't use pi_lock.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at