Date: Tue, 9 Jun 2009 16:19:45 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: renton@renton.name, linux-kernel@vger.kernel.org
Subject: Re: devpts mounts too slowly
Message-Id: <20090609161945.811cc01f.akpm@linux-foundation.org>
In-Reply-To: <4A26EB18.6060907@zytor.com>
References: <20090603142801.GC21646@beaver.vrungel.ru>
	<4A26EB18.6060907@zytor.com>
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On Wed, 03 Jun 2009 14:28:56 -0700
"H. Peter Anvin" <hpa@zytor.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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