linux-kernel - Re: devpts mounts too slowly

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Message-ID: <4A26EB18.6060907@zytor.com>
Date:	Wed, 03 Jun 2009 14:28:56 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alexey Vlasov <renton@...ton.name>
CC:	linux-kernel@...r.kernel.org
Subject: Re: devpts mounts too slowly

Alexey Vlasov wrote:
> Hi.
> 
> In comparison with bind/proc mounting it takes a lot more time mounting
> devpts. Is it possible to somehow accelerate the process? Now there are
> about 5k devpts mounting, it already took 20 minutes, further will take
> even more time.
> 
> # time mount -n -i -t devpts none /home/staff/.server-1/dev/pts
> real    0m0.295s
> user    0m0.000s
> sys     0m0.288s
> 

A profile would be handy here.  There is no sensible reason for this to
that 0.3 seconds.  This might be RCU-epoch related?

	-hpa

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