linux-kernel - Re: [PATCH v3 resend] procfs: Improve Scaling in proc

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Message-Id: <20130215154447.afd1e259.akpm@linux-foundation.org>
Date:	Fri, 15 Feb 2013 15:44:47 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Nathan Zimmer <nzimmer@....com>
Cc:	<viro@...iv.linux.org.uk>, <eric.dumazet@...il.com>,
	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v3 resend] procfs: Improve Scaling in proc

On Fri, 15 Feb 2013 17:39:38 -0600
Nathan Zimmer <nzimmer@....com> wrote:

> > So are all these games with local variable `llseek' still needed?
> > afaict the increment of pde_users will stabilize ->fops?
> We still are setting de->proc_fops to NULL to prevent new callers.
> Also we still have to save fops-> since we cannot use fops outside the 
> rcu_read_un/lock.
> Unless I misunderstood your question.

ah, so we are.
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