linux-kernel - Re: [PATCH 1/5] SCHED: add some "wait..on

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Message-ID: <20140924070418.GA990@gmail.com>
Date:	Wed, 24 Sep 2014 09:04:18 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	NeilBrown <neilb@...e.de>
Cc:	Trond Myklebust <trond.myklebust@...marydata.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Ingo Molnar <mingo@...hat.com>,
	linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jeff Layton <jeff.layton@...marydata.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 1/5] SCHED: add some "wait..on_bit...timeout()"
 interfaces.


* NeilBrown <neilb@...e.de> wrote:

> @@ -859,6 +860,8 @@ int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
>  
>  extern int bit_wait(struct wait_bit_key *);
>  extern int bit_wait_io(struct wait_bit_key *);
> +extern int bit_wait_timeout(struct wait_bit_key *);
> +extern int bit_wait_io_timeout(struct wait_bit_key *);
>  
>  /**
>   * wait_on_bit - wait for a bit to be cleared
> diff --git a/kernel/sched/wait.c b/kernel/sched/wait.c
> index 15cab1a4f84e..380678b3cba4 100644
> --- a/kernel/sched/wait.c
> +++ b/kernel/sched/wait.c
> @@ -343,6 +343,18 @@ int __sched out_of_line_wait_on_bit(void *word, int bit,
>  }
>  EXPORT_SYMBOL(out_of_line_wait_on_bit);
>  
> +int __sched out_of_line_wait_on_bit_timeout(
> +	void *word, int bit, wait_bit_action_f *action,
> +	unsigned mode, unsigned long timeout)
> +{
> +	wait_queue_head_t *wq = bit_waitqueue(word, bit);
> +	DEFINE_WAIT_BIT(wait, word, bit);
> +
> +	wait.key.timeout = jiffies + timeout;
> +	return __wait_on_bit(wq, &wait, action, mode);
> +}
> +EXPORT_SYMBOL(out_of_line_wait_on_bit_timeout);
> +
>  int __sched
>  __wait_on_bit_lock(wait_queue_head_t *wq, struct wait_bit_queue *q,
>  			wait_bit_action_f *action, unsigned mode)
> @@ -520,3 +532,27 @@ __sched int bit_wait_io(struct wait_bit_key *word)
>  	return 0;
>  }
>  EXPORT_SYMBOL(bit_wait_io);
> +
> +__sched int bit_wait_timeout(struct wait_bit_key *word)
> +{
> +	unsigned long now = ACCESS_ONCE(jiffies);
> +	if (signal_pending_state(current->state, current))
> +		return 1;
> +	if (time_after_eq(now, word->timeout))
> +		return -EAGAIN;
> +	schedule_timeout(word->timeout - now);
> +	return 0;
> +}
> +EXPORT_SYMBOL(bit_wait_timeout);
> +
> +__sched int bit_wait_io_timeout(struct wait_bit_key *word)
> +{
> +	unsigned long now = ACCESS_ONCE(jiffies);
> +	if (signal_pending_state(current->state, current))
> +		return 1;
> +	if (time_after_eq(now, word->timeout))
> +		return -EAGAIN;
> +	io_schedule_timeout(word->timeout - now);
> +	return 0;
> +}
> +EXPORT_SYMBOL(bit_wait_io_timeout);

New scheduler APIs should be exported via EXPORT_SYMBOL_GPL().

Thanks,

	Ingo
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