linux-kernel - Re: block: flush queued bios when the process blocks

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Date:	Tue, 27 May 2014 13:33:06 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Kent Overstreet <kmo@...erainc.com>,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	"Alasdair G. Kergon" <agk@...hat.com>
Subject: Re: block: flush queued bios when the process blocks

On Tue, May 27 2014 at 12:26pm -0400,
Mikulas Patocka <mpatocka@...hat.com> wrote:

> On Tue, 27 May 2014, Jens Axboe wrote:
> 
> > On 2014-05-27 09:23, Mikulas Patocka wrote:
> > 
> > > The patch adds bio list flushing to the scheduler just besides plug
> > > flushsing.
> > 
> > ... which is exactly why I'm commenting. It'd be great to avoid yet one more
> > scheduler hook for this sort of thing.
> > 
> > -- 
> > Jens Axboe
> 
> One could create something like schedule notifier chain, but I'm not sure 
> if it is worth the complexity because of just two users. If more users 
> come in the future, it could be generalized.

It could be that Jens is suggesting updating blk_needs_flush_plug() and
blk_schedule_flush_plug() to be bio_list aware too (rather than train
sched_submit_work() from this new bio_list)?

Somewhat awkward, but _could_ be made to work.
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