linux-kernel - Re: increased vmap_area_lock contentions on "n_tty: Move buffers into n_tty

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Date:	Thu, 12 Sep 2013 20:17:00 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Peter Hurley <peter@...leysoftware.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org,
	Tejun Heo <tj@...nel.org>
Subject: Re: increased vmap_area_lock contentions on "n_tty: Move buffers
 into n_tty_data"

On Fri, Sep 13, 2013 at 08:51:33AM +0800, Fengguang Wu wrote:
> Hi Peter,
> 
> FYI, we noticed much increased vmap_area_lock contentions since this
> commit:

What does that mean?  What is happening, are we allocating/removing more
memory now?

What type of load were you running that showed this problem?

thanks,

greg k-h
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