netdev - Re: [PATCH] TX_RING and packet mmap

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Message-ID: <7e0dd21a0904210616o7bdbebc2p8ed29b47ac573e34@mail.gmail.com>
Date:	Tue, 21 Apr 2009 15:16:49 +0200
From:	Johann Baudy <johann.baudy@...-log.net>
To:	Evgeniy Polyakov <zbr@...emap.net>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>, jamal <hadi@...erus.ca>
Subject: Re: [PATCH] TX_RING and packet mmap

Hi Evgeniy,
> It cals skb_release_data() which should invoke shared area destructor
> before being freed.

Yes but in this case, it will be called twice, as shared info (that
contains destructor) is memcopied to new expanded head.
shared info destructor will be excuted two times on "same" data
(during skb_expand_head() and during kfree_skb())
Actually, I want to know if this behavior is intended with a new
shared info destructor.

Thanks
-- 
Johann Baudy
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