netdev - Re: [PATCH] pkt_sched: Control group classifier

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Date:	Fri, 17 Oct 2008 20:23:12 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] pkt_sched: Control group classifier

* Andi Kleen <andi@...stfloor.org> 2008-10-16 07:41
> Thomas Graf <tgraf@...g.ch> writes:
> >
> > The principle of the classifier is to directly access the
> > task_struct via get_current(). In order for this to work,
> > classification requests from softirqs must be ignored.
> 
> You mean the classifier just wants to know if it runs
> as a softirq?

Yes, exactly.

> > This is
> > not a problem because the vast majority of packets in softirq
> > context are not assigned to a task anyway. For this to work, a
> > mechanism is needed to trace softirq context.
> > The only existing
> > way to do so is to use the TRACE_IRQFLAGS feature, unfortunately
> 
> Does't softirq_count() > 0 check that?

softirq_count() simply counts the levels of bh disable.
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