From: Preeti U Murthy <preeti@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
mingo@kernel.org, linux-kernel@vger.kernel.org,
linux@arm.linux.org.uk, linux-arm-kernel@lists.infradead.org,
riel@redhat.com, Morten.Rasmussen@arm.com, efault@gmx.de,
nicolas.pitre@linaro.org, linaro-kernel@lists.linaro.org,
daniel.lezcano@linaro.org, dietmar.eggemann@arm.com
Subject: Re: [PATCH v5 04/12] sched: Allow all archs to set the capacity_orig
Date: Thu, 11 Sep 2014 16:06:06 +0530 [thread overview]
Message-ID: <54117B16.9050409@linux.vnet.ibm.com> (raw)
In-Reply-To: <20140910135039.GP3190@worktop.ger.corp.intel.com>
On 09/10/2014 07:20 PM, Peter Zijlstra wrote:
> On Sat, Aug 30, 2014 at 10:37:40PM +0530, Preeti U Murthy wrote:
>>> - if ((sd->flags & SD_SHARE_CPUCAPACITY) && weight > 1) {
>>> - if (sched_feat(ARCH_CAPACITY))
>>
>> Aren't you missing this check above? I understand that it is not
>> crucial, but that would also mean removing ARCH_CAPACITY sched_feat
>> altogether, wouldn't it?
>
> Yes he's missing that, I added the below bit on top.
>
> So the argument last time:
> lkml.kernel.org/r/20140709105721.GT19379@twins.programming.kicks-ass.net
> was that you cannot put sched_feat(ARCH_CAPACITY) inside a weak arch_*
> function. The test has to be outside, seeing how it needs to decide to
> call the arch function at all (or revert to the default implementation).
>
> ---
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -5700,7 +5700,7 @@ unsigned long __weak arch_scale_freq_cap
> return default_scale_capacity(sd, cpu);
> }
>
> -unsigned long __weak arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
> +static unsigned long default_scale_cpu_capacity(struct sched_domain *sd, int cpu)
> {
> if ((sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1))
> return sd->smt_gain / sd->span_weight;
> @@ -5708,6 +5708,11 @@ unsigned long __weak arch_scale_cpu_capa
> return SCHED_CAPACITY_SCALE;
> }
>
> +unsigned long __weak arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
> +{
> + return default_scale_cpu_capacity(sd, cpu);
> +}
> +
> static unsigned long scale_rt_capacity(int cpu)
> {
> struct rq *rq = cpu_rq(cpu);
> @@ -5747,7 +5752,10 @@ static void update_cpu_capacity(struct s
> unsigned long capacity = SCHED_CAPACITY_SCALE;
> struct sched_group *sdg = sd->groups;
>
> - capacity *= arch_scale_cpu_capacity(sd, cpu);
> + if (sched_feat(ARCH_CAPACITY))
> + capacity *= arch_scale_cpu_capacity(sd, cpu);
> + else
> + capacity *= default_scale_cpu_capacity(sd, cpu);
>
> capacity >>= SCHED_CAPACITY_SHIFT;
>
>
Alright, I see now. Thanks!
Regards
Preeti U Murthy
next prev parent reply other threads:[~2014-09-11 10:36 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-26 11:06 [PATCH v5 00/12] sched: consolidation of cpu_capacity Vincent Guittot
2014-08-26 11:06 ` [PATCH v5 01/12] sched: fix imbalance flag reset Vincent Guittot
2014-09-19 11:47 ` [tip:sched/core] sched: Fix " tip-bot for Vincent Guittot
2014-08-26 11:06 ` [PATCH v5 02/12] sched: remove a wake_affine condition Vincent Guittot
2014-09-19 11:47 ` [tip:sched/core] sched: Remove a wake_affine() condition tip-bot for Vincent Guittot
2014-08-26 11:06 ` [PATCH v5 03/12] sched: fix avg_load computation Vincent Guittot
2014-08-30 12:00 ` Preeti U Murthy
2014-09-03 11:09 ` Vincent Guittot
2014-09-03 23:43 ` Tim Chen
2014-09-04 7:17 ` Vincent Guittot
2014-09-04 16:26 ` Tim Chen
2014-09-05 11:10 ` Preeti U Murthy
2014-09-19 11:47 ` [tip:sched/core] sched: Fix " tip-bot for Vincent Guittot
2014-08-26 11:06 ` [PATCH v5 04/12] sched: Allow all archs to set the capacity_orig Vincent Guittot
2014-08-27 13:12 ` Kamalesh Babulal
2014-08-30 17:07 ` Preeti U Murthy
2014-09-01 8:05 ` Vincent Guittot
2014-09-03 8:41 ` Preeti U Murthy
2014-09-10 13:50 ` Peter Zijlstra
2014-09-10 14:22 ` Vincent Guittot
2014-09-11 10:36 ` Preeti U Murthy [this message]
2014-09-19 11:47 ` [tip:sched/core] sched: Allow all architectures to set ' capacity_orig' tip-bot for Vincent Guittot
2014-08-26 11:06 ` [PATCH v5 05/12] ARM: topology: use new cpu_capacity interface Vincent Guittot
2014-09-11 18:52 ` Nicolas Pitre
2014-09-19 11:48 ` [tip:sched/core] ARM: topology: Use the " tip-bot for Vincent Guittot
2014-08-26 11:06 ` [PATCH v5 06/12] sched: add per rq cpu_capacity_orig Vincent Guittot
2014-08-27 13:32 ` Kamalesh Babulal
2014-08-28 7:34 ` Vincent Guittot
2014-09-10 13:53 ` Peter Zijlstra
2014-09-10 14:19 ` Vincent Guittot
2014-09-11 19:02 ` Nicolas Pitre
2014-09-15 21:22 ` Vincent Guittot
2014-08-26 11:06 ` [PATCH v5 07/12] sched: test the cpu's capacity in wake affine Vincent Guittot
2014-09-10 14:19 ` Peter Zijlstra
2014-09-19 11:48 ` [tip:sched/core] sched: Test the CPU's capacity in wake_affine() tip-bot for Vincent Guittot
2014-08-26 11:06 ` [PATCH v5 08/12] sched: move cfs task on a CPU with higher capacity Vincent Guittot
2014-08-30 17:50 ` Preeti U Murthy
2014-09-01 8:45 ` Vincent Guittot
2014-09-03 9:11 ` Preeti U Murthy
2014-09-03 11:44 ` Vincent Guittot
2014-09-03 12:26 ` Preeti U Murthy
2014-09-03 12:49 ` Vincent Guittot
2014-09-11 9:27 ` Peter Zijlstra
2014-09-05 12:06 ` Preeti U Murthy
2014-09-05 12:24 ` Vincent Guittot
2014-09-11 10:07 ` Peter Zijlstra
2014-09-11 11:20 ` Vincent Guittot
2014-09-11 10:13 ` Peter Zijlstra
2014-09-11 12:14 ` Vincent Guittot
2014-09-11 11:54 ` Peter Zijlstra
2014-08-26 11:06 ` [PATCH v5 09/12] sched: add usage_load_avg Vincent Guittot
2014-09-04 7:34 ` [PATCH v5 09/11] " Vincent Guittot
2014-09-11 11:17 ` Peter Zijlstra
2014-09-11 11:17 ` [PATCH v5 09/12] " Peter Zijlstra
2014-09-11 12:18 ` Vincent Guittot
2014-09-11 12:20 ` Vincent Guittot
2014-09-15 19:15 ` Morten Rasmussen
2014-09-15 22:33 ` Vincent Guittot
2014-08-26 11:06 ` [PATCH v5 10/12] sched: get CPU's utilization statistic Vincent Guittot
2014-09-11 12:34 ` Peter Zijlstra
2014-09-11 13:07 ` Vincent Guittot
2014-09-11 14:04 ` Peter Zijlstra
2014-09-11 19:17 ` Nicolas Pitre
2014-09-12 7:41 ` Vincent Guittot
2014-09-15 19:45 ` Morten Rasmussen
2014-09-16 22:43 ` Vincent Guittot
2014-09-15 19:28 ` Morten Rasmussen
2014-08-26 11:06 ` [PATCH v5 11/12] sched: replace capacity_factor by utilization Vincent Guittot
2014-09-11 15:39 ` Peter Zijlstra
2014-09-11 16:15 ` Peter Zijlstra
2014-09-11 17:26 ` Vincent Guittot
2014-09-14 19:41 ` Peter Zijlstra
2014-09-14 19:51 ` Peter Zijlstra
2014-09-15 11:42 ` Peter Zijlstra
2014-09-15 19:07 ` Nicolas Pitre
2014-09-15 20:01 ` Peter Zijlstra
2014-09-17 18:45 ` Morten Rasmussen
2014-09-17 18:58 ` Morten Rasmussen
2014-09-17 23:03 ` Peter Zijlstra
2014-09-15 22:14 ` Vincent Guittot
2014-09-15 22:18 ` Vincent Guittot
2014-09-17 22:25 ` Peter Zijlstra
2014-09-18 1:32 ` Vincent Guittot
2014-09-16 17:00 ` Dietmar Eggemann
2014-08-26 11:06 ` [PATCH v5 12/12] sched: add SD_PREFER_SIBLING for SMT level Vincent Guittot
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