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From: Valentin Schneider <valentin.schneider@arm.com>
To: Steven Sistare <steven.sistare@oracle.com>,
	mingo@redhat.com, peterz@infradead.org
Cc: subhra.mazumdar@oracle.com, dhaval.giani@oracle.com,
	daniel.m.jordan@oracle.com, pavel.tatashin@microsoft.com,
	matt@codeblueprint.co.uk, umgwanakikbuti@gmail.com,
	riel@redhat.com, jbacik@fb.com, juri.lelli@redhat.com,
	vincent.guittot@linaro.org, quentin.perret@arm.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 05/10] sched/fair: Hoist idle_stamp up from idle_balance
Date: Tue, 20 Nov 2018 10:24:50 +0000	[thread overview]
Message-ID: <c177b7dc-b75a-8f0a-e266-b70f2bac780b@arm.com> (raw)
In-Reply-To: <0d8ceaff-6368-2dff-9e2c-e5928ab39bab@oracle.com>

On 19/11/2018 17:31, Steven Sistare wrote:
[...]
>>> +#define IF_SMP(statement)	statement
>>> +
>>
>> I'm not too hot on those IF_SMP() macros. Since you're not introducing
>> any other user for them, what about an inline function for rq->idle_stamp
>> setting ? When it's mapped to an empty statement (!CONFIG_SMP) GCC is
>> smart enough to remove the rq_clock() that would be passed to it on
>> CONFIG_SMP:
> 
> That may be true now, but I worry that rq_clock or its subroutines may gain
> side effects in the future that prevent the compiler from removing it.  However,
> I could push rq_clock into the inline function:
> 
>   static inline void rq_idle_stamp_set(rq)    { rq->idle_stamp = rq_clock(rq); }
>   static inline void rq_idle_stamp_clear(rq)  { rq->idle_stamp = 0; }
> 
> I like that better, do you?
> 

That works for me, though I can't resist nitpicking on
s/rq_idle_stamp_set/rq_idle_stamp_update/

> - Steve

  reply	other threads:[~2018-11-20 10:24 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-09 12:50 [PATCH v3 00/10] steal tasks to improve CPU utilization Steve Sistare
2018-11-09 12:50 ` [PATCH v3 01/10] sched: Provide sparsemask, a reduced contention bitmap Steve Sistare
2018-11-27 15:16   ` Steven Sistare
2018-11-28  1:19     ` Omar Sandoval
2018-12-06 16:07       ` Steven Sistare
2018-12-06 18:19         ` Omar Sandoval
2018-11-09 12:50 ` [PATCH v3 02/10] sched/topology: Provide hooks to allocate data shared per LLC Steve Sistare
2018-11-09 12:50 ` [PATCH v3 03/10] sched/topology: Provide cfs_overload_cpus bitmap Steve Sistare
2018-11-09 17:38   ` Valentin Schneider
2018-11-19 17:32     ` Steven Sistare
2018-11-20 12:52       ` Valentin Schneider
2018-11-12 16:42   ` Valentin Schneider
2018-11-19 17:33     ` Steven Sistare
2018-11-20 12:42       ` Valentin Schneider
2018-11-26 19:06         ` Steven Sistare
2018-12-03 16:56           ` Valentin Schneider
2018-12-06 16:40             ` Steven Sistare
2018-12-06 17:28               ` Valentin Schneider
2018-11-09 12:50 ` [PATCH v3 04/10] sched/fair: Dynamically update cfs_overload_cpus Steve Sistare
2018-11-09 12:50 ` [PATCH v3 05/10] sched/fair: Hoist idle_stamp up from idle_balance Steve Sistare
2018-11-09 19:07   ` Valentin Schneider
2018-11-19 17:31     ` Steven Sistare
2018-11-20 10:24       ` Valentin Schneider [this message]
2018-11-09 12:50 ` [PATCH v3 06/10] sched/fair: Generalize the detach_task interface Steve Sistare
2018-11-09 12:50 ` [PATCH v3 07/10] sched/fair: Provide can_migrate_task_llc Steve Sistare
2018-11-09 12:50 ` [PATCH v3 08/10] sched/fair: Steal work from an overloaded CPU when CPU goes idle Steve Sistare
2018-11-09 12:50 ` [PATCH v3 09/10] sched/fair: disable stealing if too many NUMA nodes Steve Sistare
2018-11-09 12:50 ` [PATCH v3 10/10] sched/fair: Provide idle search schedstats Steve Sistare
2018-11-10 17:08   ` kbuild test robot
2018-11-09 15:02 ` hackbench run scripts Steven Sistare

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