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

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Date:	Thu, 19 Mar 2009 14:43:11 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Luis Henriques <henrix@...o.pt>
CC:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 -tip] sched: Clean unused fields from struct rq

Luis Henriques 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.
>>
>> Signed-off-by: Luis Henriques <henrix@...o.pt>
>>     
Acked-by: Gregory Haskins <ghaskins@...ell.com>

>> ---
>>  kernel/sched.c       |    3 ---
>>  kernel/sched_debug.c |    5 +----
>>  kernel/sched_stats.h |    7 +++----
>>  3 files changed, 4 insertions(+), 11 deletions(-)
>>
>> diff --git a/kernel/sched.c b/kernel/sched.c
>> index 8a579e2..4469034 100644
>> --- a/kernel/sched.c
>> +++ b/kernel/sched.c
>> @@ -646,9 +646,6 @@ struct rq {
>>  	/* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
>>  
>>  	/* sys_sched_yield() stats */
>> -	unsigned int yld_exp_empty;
>> -	unsigned int yld_act_empty;
>> -	unsigned int yld_both_empty;
>>  	unsigned int yld_count;
>>  
>>  	/* schedule() stats */
>> diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
>> index 4daebff..467ca72 100644
>> --- a/kernel/sched_debug.c
>> +++ b/kernel/sched_debug.c
>> @@ -286,9 +286,6 @@ static void print_cpu(struct seq_file *m, int cpu)
>>  #ifdef CONFIG_SCHEDSTATS
>>  #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, rq->n);
>>  
>> -	P(yld_exp_empty);
>> -	P(yld_act_empty);
>> -	P(yld_both_empty);
>>  	P(yld_count);
>>  
>>  	P(sched_switch);
>> @@ -313,7 +310,7 @@ static int sched_debug_show(struct seq_file *m, void *v)
>>  	u64 now = ktime_to_ns(ktime_get());
>>  	int cpu;
>>  
>> -	SEQ_printf(m, "Sched Debug Version: v0.08, %s %.*s\n",
>> +	SEQ_printf(m, "Sched Debug Version: v0.09, %s %.*s\n",
>>  		init_utsname()->release,
>>  		(int)strcspn(init_utsname()->version, " "),
>>  		init_utsname()->version);
>> diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
>> index a8f93dd..32d2bd4 100644
>> --- a/kernel/sched_stats.h
>> +++ b/kernel/sched_stats.h
>> @@ -4,7 +4,7 @@
>>   * bump this up when changing the output format or the meaning of an existing
>>   * format, so that tools can adapt (or abort)
>>   */
>> -#define SCHEDSTAT_VERSION 14
>> +#define SCHEDSTAT_VERSION 15
>>  
>>  static int show_schedstat(struct seq_file *seq, void *v)
>>  {
>> @@ -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,
>> -- 
>> 1.6.2
>>     
>
> Btw: I tried Greg schedtop with this patch and the app behaviour is as expected:
>
>   $ ./schedtop 
>   Exception: unsupported version
>
> Regards,
>   



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