Re: [RFC PATCH 4/6] kernel: faster queue spinlock implementation

[Eric Dumazet]

On Tue, 2013-01-22 at 15:13 -0800, Michel Lespinasse wrote:
>  {
> -	__q_spin_unlock(lock, node);
> -	preempt_enable_no_resched();
> -	local_bh_enable_ip((unsigned long)__builtin_return_address(0));
> +	unsigned int cpu, i;
> +	struct q_spinlock_token *token;
> +	for_each_possible_cpu(cpu)
> +		for (i = 0; i < 2; i++) {
> +			token = kmalloc(sizeof(struct q_spinlock_alloc_token),
> +					GFP_KERNEL);
> +			BUG_ON(!token);
> +			token->wait = false;
> +			per_cpu(q_spinlock_token[i], cpu) = token;
> +		}

You might use kmalloc_node(...   , cpu_to_node(cpu)) to spread these
tokens on all nodes.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/