linux-kernel - Re: RAID1 might_sleep() warning on 3.19-rc7

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Message-ID: <20150213144803.GA11574@worktop.ger.corp.intel.com>
Date:	Fri, 13 Feb 2015 15:48:03 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	NeilBrown <neilb@...e.de>
Cc:	Tony Battersby <tonyb@...ernetics.com>, linux-raid@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>, axboe@...nel.dk,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: RAID1 might_sleep() warning on 3.19-rc7

On Fri, Feb 13, 2015 at 11:27:46AM +0100, Peter Zijlstra wrote:

> > I've moved blk_flush_plug to the beginning of the function.
> 
> > I wondered if it really make sense to call blk_flush_plug with nr_iowait
> > elevated and delayacct_blkio active.  blk_flush_plug() could call schedule()
> > for non-"io" reasons and maybe that could upset stuff???
> 
> Yeah, good question that. Lemme ponder that a bit.

Yes, I thikn your version makes most sense as, you say, even regular
schedule() call nested in my version would go towards blk delayacct --
and I doubt that was the intent; even though the current kernel works
that way.

I'll move the now rudimentary io_schedule() into sched.h as an inline.
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