linux-kernel - Re: devpts mounts too slowly

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Message-Id: <20090609161945.811cc01f.akpm@linux-foundation.org>
Date:	Tue, 9 Jun 2009 16:19:45 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	renton@...ton.name, linux-kernel@...r.kernel.org
Subject: Re: devpts mounts too slowly

On Wed, 03 Jun 2009 14:28:56 -0700
"H. Peter Anvin" <hpa@...or.com> wrote:

> 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?
> 

It seems OK here.

akpm2:/home/akpm/xx# time mount -n -i -t devpts none /tmp/pts
mount -n -i -t devpts none /tmp/pts  0.00s user 0.00s system 0% cpu 0.002 total

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