linux-kernel - Re: [PATCH 1/2 -tip] sched: Clean unused fields from struct rq

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Date:	Wed, 18 Mar 2009 01:09:29 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Luis Henriques <henrix@...o.pt>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [PATCH 1/2 -tip] sched: Clean unused fields from struct rq

On Wed, 2009-03-18 at 00:03 +0000, Luis Henriques wrote:
> Since they are used on in statistics and are always set to zero, the following
> frields from struct rq have been removed: yld_exp_empty, yld_act_empty and
> yld_both_empty.
> 
> Signed-off-by: Luis Henriques <henrix@...o.pt>
> ---

> +++ b/kernel/sched_stats.h
> @@ -26,9 +26,8 @@ static int show_schedstat(struct seq_file *seq, void *v)
>  
>  		/* runqueue-specific stats */
>  		seq_printf(seq,
> -		    "cpu%d %u %u %u %u %u %u %u %u %u %llu %llu %lu",
> -		    cpu, rq->yld_both_empty,
> -		    rq->yld_act_empty, rq->yld_exp_empty, rq->yld_count,
> +		    "cpu%d %u %u %u %u %u %u %llu %llu %lu",
> +		    cpu, rq->yld_count,
>  		    rq->sched_switch, rq->sched_count, rq->sched_goidle,
>  		    rq->ttwu_count, rq->ttwu_local,
>  		    rq->rq_cpu_time,

I think this bit is ABI, so you either have to bump the version number
or emit 0s, iirc gregory touched some of that last -- or at least wrote
userspace for it..

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