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In-Reply-To: <20090609161945.811cc01f.akpm@linux-foundation.org>
References: <20090603142801.GC21646@beaver.vrungel.ru> <4A26EB18.6060907@zytor.com> 
	<20090609161945.811cc01f.akpm@linux-foundation.org>
From: Ray Lee <ray-lk@madrabbit.org>
Date: Tue, 9 Jun 2009 16:30:31 -0700
Message-ID: <2c0942db0906091630l1cc79647h8689e9e929ed1bba@mail.gmail.com>
Subject: Re: devpts mounts too slowly
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>, renton@renton.name,
       linux-kernel@vger.kernel.org
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On Tue, Jun 9, 2009 at 4:19 PM, Andrew Morton<akpm@linux-foundation.org> wrote:
> 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

I read the Original Post as that test being performed with 5k /dev/pts
already mounted.
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