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

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Date:	Tue, 24 Mar 2009 16:41:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Gregory Haskins <ghaskins@...ell.com>
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


* 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.

	Ingo
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