linux-kernel - 4.4-final: 28 bioset threads on small notebook

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Message-ID: <20160220174035.GA16459@amd>
Date:	Sat, 20 Feb 2016 18:40:35 +0100
From:	Pavel Machek <pavel@....cz>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	kernel list <linux-kernel@...r.kernel.org>, axboe@...com,
	hch@....de
Subject: 4.4-final: 28 bioset threads on small notebook


On Fri 2015-12-11 09:08:41, Mike Snitzer wrote:
> On Fri, Dec 11 2015 at  5:49am -0500,
> Pavel Machek <pavel@....cz> wrote:
> 
> > Hi!
> > 
> > I know it is normal to spawn 8 threads for every single function,
> ...
> > but 28 threads?
> > 
> > root       974  0.0  0.0      0     0 ?        S<   Dec08   0:00 [bioset]
> ...
> 
> How many physical block devices do you have?
> 
> DM is doing its part to not contribute to this:
> dbba42d8a ("dm: eliminate unused "bioset" process for each bio-based DM device")
> 
> (but yeah, all these extra 'bioset' threads aren't ideal)

Still there in 4.4-final.

Block devices:
259 blkext
  7 loop
 8 sd
 9 md
 11 sr
 43 nbd
 65 sd
 66 sd
 67 sd
 68 sd
 69 sd
 70 sd
 71 sd
	       128 sd
	       129 sd
	       130 sd
	       131 sd
	       132 sd
	       133 sd
	       134 sd
	       135 sd
	       179 mmc
	       251 device-mapper
	       252 bcache
	       253 pktcdvd
	       254 mdp
	       

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html