linux-kernel - Re: devpts mounts too slowly

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Date:	Tue, 9 Jun 2009 16:30:31 -0700
From:	Ray Lee <ray-lk@...rabbit.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, renton@...ton.name,
	linux-kernel@...r.kernel.org
Subject: Re: devpts mounts too slowly

On Tue, Jun 9, 2009 at 4:19 PM, Andrew Morton<akpm@...ux-foundation.org> wrote:
> 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

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