linux-kernel - Re: [patch 3/4 -mm] flex_array: poison free elements

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Date:	Wed, 9 Sep 2009 12:34:27 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 3/4 -mm] flex_array: poison free elements

On Wed, 9 Sep 2009, Dave Hansen wrote:

> It shouldn't be too hard to do that, though.  Although a bit silly to
> have make a copy_to_user() call for each ->parts[] page, it would be
> pretty easy to implement.  
> 

Right, but the event buffer becomes slower as a whole because of the 
multiple copy_to_user() on read, indirection into each flex_array_part, 
and add_event_entry() would now require a memcpy.
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