linux-kernel - Re: [PATCH 1/7] async: Asynchronous function calls to speed up kernel boot

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Date:	Wed, 7 Jan 2009 22:31:41 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 1/7] async: Asynchronous function calls to speed up
	kernel boot

Em Wed, Jan 07, 2009 at 03:12:26PM -0800, Arjan van de Ven escreveu:

<SNIP>

> +/*
> + * MUST be called with the lock held!
> + */
> +static async_cookie_t  __lowest_in_progress(struct list_head *running)
> +{
> +	struct async_entry *entry;
> +	if (!list_empty(&async_pending)) {
> +		entry = list_first_entry(&async_pending,
> +			struct async_entry, list);

Small nitpick:

- > +		return entry->cookie;
> +	} else if (!list_empty(running)) {
> +		entry = list_first_entry(running,
> +			struct async_entry, list);
- > +		return entry->cookie;
> +	} else {
> +		/* nothing in progress... next_cookie is "infinity" */
> +		return next_cookie;
> +	}

+ 	return entry->cookie;

> +/*
> + * pick the first pending entry and run it
> + */
> +static void run_one_entry(void)
> +{
> +	unsigned long flags;
> +	struct async_entry *entry;
> +	ktime_t calltime, delta, rettime;
> +
> +	/* 1) pick one task from the pending queue */
> +
> +	spin_lock_irqsave(&async_lock, flags);
> +	if (list_empty(&async_pending))
> +		goto out;
> +	entry = list_first_entry(&async_pending, struct async_entry, list);
> +
> +	/* 2) move it to the running queue */
> +	list_del(&entry->list);
> +	list_add_tail(&entry->list, &async_running);

We have list_move_tail()

> +	spin_unlock_irqrestore(&async_lock, flags);
> +
> +	/* 3) run it (and print duration)*/
> +	if (initcall_debug) {
> +		printk("calling  %lli_%pF @ %i\n", entry->cookie, entry->func, task_pid_nr(current));
> +		calltime = ktime_get();

- Arnaldo
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