linux-kernel - Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency consideration

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Message-ID: <20170222131218.GS6515@twins.programming.kicks-ass.net>
Date:   Wed, 22 Feb 2017 14:12:18 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mike Galbraith <efault@....de>
Cc:     Alex Shi <alex.shi@...aro.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency
 consideration

On Wed, Feb 22, 2017 at 01:56:37PM +0100, Mike Galbraith wrote:
> Hi,
> 
> Do we really need a spinlock for that in the idle loop?

Urgh, that's broken on RT, you cannot schedule the idle loop.

Also, yeah, reading a s32 should not need no locking, but there's a
bunch of pointer chases in between :/

Nasty code that..