netdev - Re: [PATCH net-next 2/2] net: exit busy loop when another process is runnable

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Message-ID: <20140902061222.GE5806@worktop.ger.corp.intel.com>
Date:	Tue, 2 Sep 2014 08:12:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jason Wang <jasowang@...hat.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH net-next 2/2] net: exit busy loop when another process is
 runnable

On Tue, Sep 02, 2014 at 11:38:40AM +0800, Jason Wang wrote:
> I see, how about just exporting a boolean helper like
> current_can_busy_loop() and take care all of the conditions (pending bhs
> and rcu callbacks, runnable processes) in scheduler code itself?

How is that going to help the cases that are hurt by not spinning for a
packet?
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