linux-kernel - Re: 4.4-rc: 28 bioset threads on small notebook

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Message-ID: <20151211140841.GA22873@redhat.com>
Date:	Fri, 11 Dec 2015 09:08:41 -0500
From:	Mike Snitzer <snitzer@...hat.com>
To:	Pavel Machek <pavel@....cz>
Cc:	kernel list <linux-kernel@...r.kernel.org>, axboe@...com,
	hch@....de
Subject: Re: 4.4-rc: 28 bioset threads on small notebook

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)
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