Date: Fri, 11 Dec 2015 09:08:41 -0500
From: Mike Snitzer <snitzer@redhat.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: kernel list <linux-kernel@vger.kernel.org>, axboe@fb.com, hch@lst.de
Subject: Re: 4.4-rc: 28 bioset threads on small notebook
Message-ID: <20151211140841.GA22873@redhat.com>
References: <20151211104937.GA23165@amd>
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On Fri, Dec 11 2015 at  5:49am -0500,
Pavel Machek <pavel@ucw.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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