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

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Message-ID: <54053998.4040604@redhat.com>
Date:	Tue, 02 Sep 2014 11:29:28 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Eliezer Tamir <eliezer.tamir@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>
CC:	Mike Galbraith <umgwanakikbuti@...il.com>, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	mst@...hat.com, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH net-next 2/2] net: exit busy loop when another process
 is runnable

On 09/01/2014 02:39 PM, Eliezer Tamir wrote:
> On 29/08/2014 06:08, Jason Wang wrote:
>> > Yes, but rx busy polling only works in process context and does not
>> > disable bh, so it may be not an issue.
> sk_busy_loop() uses rcu_read_lock_bh(), so it does run with bh disabled.
>
> -Eliezer

True, so we need probably also exit the loop when there are pending bhs.
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