linux-kernel - Re: pm qos infrastructure and interface

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Message-Id: <20071010221704.6e438c71.akpm@linux-foundation.org>
Date:	Wed, 10 Oct 2007 22:17:04 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	mgross@...ux.intel.com
Cc:	arjan@...radead.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, linux-pm@...ts.linux-foundation.org,
	mark.gross@...el.com
Subject: Re: pm qos infrastructure and interface

On Thu, 4 Oct 2007 14:51:39 -0700 Mark Gross <mgross@...ux.intel.com> wrote:

> The following patch is a generalization of the latency.c implementation
> done by Arjan last year.  It provides infrastructure for more than one
> parameter, and exposes a user mode interface for processes to register
> pm_qos expectations of processes.
> 
> 
> This interface provides a kernel and user mode interface for registering
> performance expectations by drivers, subsystems and user space
> applications on one of the parameters.
> 
> Currently we have {cpu_dma_latency, network_latency, network_throughput}
> as the initial set of pm_qos parameters.
> 
> The infrastructure exposes multiple misc device nodes one per
> implemented parameter.  The set of parameters implement is defined by
> pm_qos_power_init() and pm_qos_params.h.  This is done because having
> the available parameters being runtime configurable or changeable from a
> driver was seen as too easy to abuse.

I'm a bit surprised that this change appears to have no configurability.
If one has set CONFIG_PM=n (for example), shouldn't it all go away?
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