linux-kernel - Re: [PATCH v3 -tip] sched: Clean unused fields from struct rq

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Date:	Tue, 24 Mar 2009 11:59:34 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Luis Henriques <henrix@...o.pt>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 -tip] sched: Clean unused fields from struct rq

Ingo Molnar wrote:
> * Gregory Haskins <ghaskins@...ell.com> wrote:
>
>   
>> Ingo Molnar wrote:
>>     
>>> * Luis Henriques <henrix@...o.pt> wrote:
>>>
>>>   
>>>       
>>>> On Wed, Mar 18, 2009 at 10:51:37PM +0000, Luis Henriques wrote:
>>>>     
>>>>         
>>>>> Since they are used on in statistics and are always set to zero, the following
>>>>> fields from struct rq have been removed: yld_exp_empty, yld_act_empty and
>>>>> yld_both_empty.
>>>>>
>>>>> Both Sched Debug and SCHEDSTAT_VERSION versions has also been incremented since
>>>>> ABIs have been changed.
>>>>>
>>>>>       
>>>>>           
>>>> Hi Ingo,
>>>>
>>>> Sorry to bother you but I can not find this patch in -tip.  Just 
>>>> would like to confirm with you that it was NACK'ed or you just 
>>>> forgot to merge it to the tree.
>>>>     
>>>>         
>>> Was held up by the schedstat tool discussions. Please resend the 
>>> patch with a link to the updated tool in the commit log perhaps (if 
>>> such a link exists), and with Gregory's ack in place.
>>>
>>> Thanks,
>>>
>>> 	Ingo
>>>   
>>>       
>> Hi Ingo,
>>   I was waiting to merge the tool patch until I was sure this would be
>> your blessed v15 of the ABI.  If you are comfy with the kernel patch but
>> want the tool updated before the kernel, I can do that, no problem.  The
>> only thing that I ask is that if for some reason this kernel patch
>> doesn't make it in, please require any future patches that change this
>> ABI to be versioned > 15 ;)
>>     
>
> How about moving schedstat to Documentation/sched/schedstat.c or so? 
> It's small and trivial enough, and that way changes would go hand in 
> hand with the app.
>   
Oh, I misunderstood.  The tool patch I was referencing is for my
schedtop tool that is in a separate tree and written in C++.   In
retrospect, you probably don't care about the relative state of my tool
coincident with the kernel side change, then.  I agree that this other
schedstat tool should probably be in-tree and patched at the same time
as Luis' kernel patch.

FWIW: I have no problem with schedtop.cc going into the kernel as well
if that is what you would like, but I figured I would be burned at the
stake for suggestion such heresy as C++ in the tree ;)

-Greg


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