linux-kernel - Re: [PATCH 0/2] sparc64: Use low latency path to resume idle cpu

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Message-ID: <fe29a8fc-8009-ee4c-cc6b-403e77afa5c7@oracle.com>
Date:   Thu, 20 Jul 2017 23:11:45 -0500
From:   Vijay Kumar <vijay.ac.kumar@...cle.com>
To:     David Miller <davem@...emloft.net>
Cc:     sparclinux@...r.kernel.org, rob.gardner@...cle.com,
        anthony.yznaga@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] sparc64: Use low latency path to resume idle cpu


On 7/20/2017 10:45 PM, David Miller wrote:
> From: Vijay Kumar <vijay.ac.kumar@...cle.com>
> Date: Thu, 20 Jul 2017 22:36:42 -0500
>
>> I can give a try :). But looks to me one thing that will go wrong is
>> irq accounting done in __irq_enter() and rcu_irq_enter().
> Actually, the bigger problem is that scheduler_ipi() can raise a
> software interrupt, and nothing will invoke it.
Yes, I see your point.

> It's turning quite ugly to avoid the IRQ overhead, I must admit.
> So ignore this for now.
>
> In the longer term a probably cleaner way to do this is to have
> a special direct version of scheduler_ipi() that invokes all the
> necessary work, even the rebalance softirq, directly rather than
> indirectly.

Sure. Thanks.