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

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Date:	Thu, 25 Sep 2014 13:23:39 +1000
From:	NeilBrown <neilb@...e.de>
To:	Ingo Molnar <mingo@...nel.org>,
	Trond Myklebust <trond.myklebust@...marydata.com>
Cc:	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.

On Wed, 24 Sep 2014 09:04:18 +0200 Ingo Molnar <mingo@...nel.org> wrote:

> 
> * 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().
> 

Fine with me.

 Trond, can you just edit that into the patch you have, or do you want me to
 re-send?
 Also maybe added Jeff's 
    Acked-by: Jeff Layton <jlayton@...marydata.com>
 to the NFS bits.

Thanks,
NeilBrown

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