linux-kernel - Re: [PATCH 2/2] proc: faster /proc/$PID lookup

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Message-ID: <20140708215029.GC2382@p183.telecom.by>
Date:	Wed, 9 Jul 2014 00:50:29 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: [PATCH 2/2] proc: faster /proc/$PID lookup

On Wed, Jul 09, 2014 at 12:45:57AM +0300, Alexey Dobriyan wrote:
> Currently lookup for /proc/$PID first goes through spinlock and
> whole list of misc /proc entries only to confirm that, yes,
> /proc/42 can not possibly match random proc entry.
> 
> List is is several dozens entries long (52 entries on my setup).
> 
> None of this is necessary.
> 
> Try to convert dentry name to integer first.
> If it works, it must be /proc/$PID.
> If it doesn't, it must be random proc entry.

Recycled from Al Viro's patch as well!
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