linux-kernel - Re: RFC: Allow block drivers to poll for I/O instead of sleeping

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Message-ID: <1372168648.18733.200.camel@gandalf.local.home>
Date:	Tue, 25 Jun 2013 09:57:28 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Matthew Wilcox <willy@...ux.intel.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-nvme@...ts.infradead.org,
	Linux SCSI List <linux-scsi@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: RFC: Allow block drivers to poll for I/O instead of sleeping

On Mon, 2013-06-24 at 23:07 -0400, Matthew Wilcox wrote:
> On Mon, Jun 24, 2013 at 08:11:02PM -0400, Steven Rostedt wrote:
> > What about hooking into the idle_balance code? That happens if we are
> > about to go to idle but before the full schedule switch to the idle
> > task.
> > 
> > 
> > In __schedule(void):
> > 
> > 	if (unlikely(!rq->nr_running))
> > 		idle_balance(cpu, rq);
> 
> That may be a great place to try it from the PoV of the scheduler, but are
> you OK with me threading a struct backing_dev_info * all the way through
> the scheduler to idle_balance()?  :-)

Well, there's other ways to pass data down besides parameters. You could
attach something to the task itself.

-- Steve


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