From: Kieran Mansley <kmansley@solarflare.com>
To: Keir Fraser <keir@xensource.com>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>,
muli@il.ibm.com, netdev@vger.kernel.org,
xen-devel@lists.xensource.com, herbert@gondor.apana.org.au
Subject: Re: [Xen-devel] Re: [PATCH 3/4] [Net] Support Xen accelerated network plugin modules
Date: Tue, 22 May 2007 13:44:28 +0100 [thread overview]
Message-ID: <1179837868.28562.22.camel@moonstone.uk.level5networks.com> (raw)
In-Reply-To: <C2785EC4.F4E3%keir@xensource.com>
On Tue, 2007-05-22 at 08:48 +0100, Keir Fraser wrote:
>
>
> On 22/5/07 08:28, "Kieran Mansley" <kmansley@solarflare.com> wrote:
>
> > On Tue, 2007-05-22 at 08:15 +0100, Kieran Mansley wrote:
> >> RCU on its own wouldn't
> >> prevent the accelerated plugin being unloaded while netfront was using
> >> one of the hooks.
> >
> > Hmm, actually I think it could be used to do that. I'll take a look.
>
> Eagerly zap the function pointers, then wait one RCU period so every CPU
> goes through a quiescent point before unloading the module?
>
> -- Keir
Am I right in thinking that if one of the functions that was protected
by RCU was to block, that would be a bad thing? Clearly the data path
hooks can't/don't block, but I'm not sure it's so obvious for things
like probing a new device.
Kieran
next prev parent reply other threads:[~2007-05-22 12:44 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-18 13:16 [PATCH 3/4] [Net] Support Xen accelerated network plugin modules Kieran Mansley
2007-05-21 17:50 ` Stephen Hemminger
2007-05-22 7:00 ` Kieran Mansley
2007-05-21 17:52 ` Stephen Hemminger
2007-05-22 7:15 ` Kieran Mansley
2007-05-22 7:28 ` Kieran Mansley
2007-05-22 7:48 ` [Xen-devel] " Keir Fraser
2007-05-22 7:59 ` Kieran Mansley
2007-05-22 12:44 ` Kieran Mansley [this message]
2007-05-22 14:07 ` Keir Fraser
2007-05-22 14:20 ` Kieran Mansley
2007-05-22 15:05 ` Stephen Hemminger
2007-05-22 16:06 ` Kieran Mansley
2007-05-25 6:53 ` Andi Kleen
2007-05-21 17:54 ` Stephen Hemminger
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