linux-kernel - Re: [patch 0/5] powercap/intel_rapl: Fixes, hotplug conversion and simplifcation

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Date:   Wed, 23 Nov 2016 11:06:47 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, Rafael Wysocki <rjw@...k.pl>,
        x86@...nel.org, Peter Zijlstra <peterz@...radead.org>,
        linux-pm@...r.kernel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...el.com>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [patch 0/5] powercap/intel_rapl: Fixes, hotplug conversion and
 simplifcation

On Tue, 22 Nov 2016 21:15:56 -0000
Thomas Gleixner <tglx@...utronix.de> wrote:

> The driver fails to:
> 
>  - initialize packages which are not available at driver init time,
> though the value of that initialization is completely unclear as
> nothing ever uses these values. I fixed it up nevertheless and leave
> it to the maintainers to decide whether it should completely go away.
> 
>  - to propagate error codes in the hotplug online path, where a
>    registration fails and the package data is freed, but return code
> is 0.
> 
> The initialization/removal code of that driver is a maze of
> duplicated code which is more or less the same as the cpu hotplug
> code. After switching over the driver to the hotplug statemachine,
> the whole init/removal machinery can be replaced by
> installing/removing the hotplug state.
> 
> The total damage is:
> 
>  intel_rapl.c |  363
> ++++++++++++++++------------------------------------------- 1 file
> changed, 104 insertions(+), 259 deletions(-)
> 
> and the binary size shrinks as well:
> 
>    text	   data	    bss	    dec	    hex
>    7996	    625	     32	   8653
> 21cd	  Before 7216	    593	     32
> 7841	   1ea1	  After
> 
I have successfully tested this patchset with various cpu online/offline
scenarios on both single and dual socket systems.

Looks good to me. The cpu topology management is much more streamlined.
Thanks. I also sent out this patch below on top of yours.

[PATCH] powercap/intel_rapl: fix and tidy up error handling

Thanks,

Jacob
> Thanks,
> 
> 	tglx
> 
> 
> 
> 

[Jacob Pan]