From: Andi Kleen <andi@firstfloor.org>
To: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Cc: vinay ravuri <vinaynyc@yahoo.com>,
Stephen Hemminger <shemminger@linux-foundation.org>,
netdev@vger.kernel.org
Subject: Re: Socket Buffers and Memory Managment
Date: 20 Jul 2007 13:50:30 +0200 [thread overview]
Message-ID: <p73tzrzuwe1.fsf@bingen.suse.de> (raw)
In-Reply-To: <20070719090826.GA14860@2ka.mipt.ru>
Evgeniy Polyakov <johnpol@2ka.mipt.ru> writes:
> Hi.
>
> On Wed, Jul 18, 2007 at 11:51:03PM -0700, vinay ravuri (vinaynyc@yahoo.com) wrote:
> > How about the following approach:
> >
> > I allocate an skb of 0 bytes and replace data element
> > of skb struct (i.e. skb.data = addr_given_by_hw) when
> > the h/w interrupts me with a packet. I register for a
> > destructor for this skb and when the kernel is ready
> > to free the skb, I make sure that my free is invoked -
> > Ofcourse this is assuming that their is a facility in
> > linux socket buffers to be able to do destructors. Is
> > this approach a viable, if so, are any gottcha's?
>
> It will not work, since kfree_skb() eventually tries to free skb->head
> into kmem cache,
And in addition if the skbuff is ever passed towards the socket
layer the destructor will be overwritten
-Andi
prev parent reply other threads:[~2007-07-20 10:55 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-17 17:20 Socket Buffers and Memory Managment vinay ravuri
2007-07-17 19:41 ` Stephen Hemminger
2007-07-17 19:44 ` David Miller
2007-07-18 17:13 ` Roy Pledge
2007-07-18 21:22 ` Stephen Hemminger
2007-07-19 6:51 ` vinay ravuri
2007-07-19 7:04 ` pradeep singh
2007-07-19 8:10 ` Stephen Hemminger
2007-07-19 9:08 ` Evgeniy Polyakov
2007-07-20 11:50 ` Andi Kleen [this message]
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