From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, tj@kernel.org,
josef@toxicpanda.com, torvalds@linux-foundation.org,
vincent.guittot@linaro.org, efault@gmx.de, pjt@google.com,
clm@fb.com, morten.rasmussen@arm.com, bsegall@google.com,
yuyang.du@intel.com
Subject: Re: [PATCH -v2 13/18] sched/fair: Propagate an effective runnable_load_avg
Date: Tue, 3 Oct 2017 10:29:26 +0100 [thread overview]
Message-ID: <64f045cc-31f3-4194-c3ea-6ea11f52b798@arm.com> (raw)
In-Reply-To: <20171003085020.cztmctn2252mcu6k@hirez.programming.kicks-ass.net>
On 03/10/17 09:50, Peter Zijlstra wrote:
> On Mon, Oct 02, 2017 at 06:46:32PM +0100, Dietmar Eggemann wrote:
>
>>> +/*
>>> + * Recomputes the group entity based on the current state of its group
>>> + * runqueue.
>>> + */
>>> +static void update_cfs_group(struct sched_entity *se)
>>
>> update_cfs_share(s)() is still mentioned in the function header of
>> update_tg_load_avg() and update_cfs_rq_load_avg().
>>
>> Should we rename those comments with this patch?
>>
>> IMHO, the comment for update_tg_load_avg() is still true whereas the one
>> for update_cfs_rq_load_avg() mentions cfs_rq->avg as
>> cfs_rq->avg.load_avg (or cfs_rq_load_avg()) and update_cfs_group()
>> doesn't use it anymore. It's now used in calc_group_runnable() and
>> calc_group_shares() instead.
>>
>> [...]
>
> Right, so something like the below? Thinking that update_cfs_group()
> immediately leads to calc_group_*() so no need to spell those out.
Looks good to me, agreed.
>
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 350dbec01523..fee2e34812da 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -3333,7 +3333,7 @@ __update_load_avg_cfs_rq(u64 now, int cpu, struct cfs_rq *cfs_rq)
> * differential update where we store the last value we propagated. This in
> * turn allows skipping updates if the differential is 'small'.
> *
> - * Updating tg's load_avg is necessary before update_cfs_share().
> + * Updating tg's load_avg is necessary before update_cfs_group().
> */
> static inline void update_tg_load_avg(struct cfs_rq *cfs_rq, int force)
> {
> @@ -3601,7 +3601,7 @@ static inline void add_tg_cfs_propagate(struct cfs_rq *cfs_rq, long runnable_sum
> * avg. The immediate corollary is that all (fair) tasks must be attached, see
> * post_init_entity_util_avg().
> *
> - * cfs_rq->avg is used for task_h_load() and update_cfs_share() for example.
> + * cfs_rq->avg is used for task_h_load() and update_cfs_group() for example.
> *
> * Returns true if the load decayed or we removed load.
> *
>
next prev parent reply other threads:[~2017-10-03 9:29 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-01 13:20 [PATCH -v2 00/18] sched/fair: A bit of a cgroup/PELT overhaul Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 01/18] sched/fair: Clean up calc_cfs_shares() Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 02/18] sched/fair: Add comment to calc_cfs_shares() Peter Zijlstra
2017-09-28 10:03 ` Morten Rasmussen
2017-09-29 11:35 ` Peter Zijlstra
2017-09-29 13:03 ` Morten Rasmussen
2017-09-01 13:21 ` [PATCH -v2 03/18] sched/fair: Cure calc_cfs_shares() vs reweight_entity() Peter Zijlstra
2017-09-29 9:04 ` Morten Rasmussen
2017-09-29 11:38 ` Peter Zijlstra
2017-09-29 13:00 ` Morten Rasmussen
2017-09-01 13:21 ` [PATCH -v2 04/18] sched/fair: Remove se->load.weight from se->avg.load_sum Peter Zijlstra
2017-09-29 15:26 ` Morten Rasmussen
2017-09-29 16:39 ` Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 05/18] sched/fair: Change update_load_avg() arguments Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 06/18] sched/fair: Move enqueue migrate handling Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 07/18] sched/fair: Rename {en,de}queue_entity_load_avg() Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 08/18] sched/fair: Introduce {en,de}queue_load_avg() Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 09/18] sched/fair: More accurate reweight_entity() Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 10/18] sched/fair: Use reweight_entity() for set_user_nice() Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 11/18] sched/fair: Rewrite cfs_rq->removed_*avg Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 12/18] sched/fair: Rewrite PELT migration propagation Peter Zijlstra
2017-10-09 8:08 ` Morten Rasmussen
2017-10-09 9:45 ` Peter Zijlstra
2017-10-18 12:45 ` Morten Rasmussen
2017-10-30 13:35 ` Peter Zijlstra
2017-10-09 15:03 ` Vincent Guittot
2017-10-09 15:29 ` Vincent Guittot
2017-10-10 7:29 ` Peter Zijlstra
2017-10-10 7:44 ` Vincent Guittot
2017-10-13 15:22 ` Vincent Guittot
2017-10-13 20:41 ` Peter Zijlstra
2017-10-15 12:01 ` Vincent Guittot
2017-10-16 13:55 ` Vincent Guittot
2017-10-19 15:04 ` Vincent Guittot
2017-10-30 17:20 ` Peter Zijlstra
2017-10-31 11:14 ` Vincent Guittot
2017-10-31 15:01 ` Peter Zijlstra
2017-10-31 16:38 ` Vincent Guittot
2017-11-16 14:09 ` [PATCH v3] sched: Update runnable propagation rule Vincent Guittot
2017-11-16 14:21 ` [PATCH v4] " Vincent Guittot
2017-12-06 11:40 ` Peter Zijlstra
2017-12-06 17:10 ` Ingo Molnar
2017-12-06 20:29 ` [tip:sched/core] sched/fair: Update and fix the " tip-bot for Vincent Guittot
2017-09-01 13:21 ` [PATCH -v2 13/18] sched/fair: Propagate an effective runnable_load_avg Peter Zijlstra
2017-10-02 17:46 ` Dietmar Eggemann
2017-10-03 8:50 ` Peter Zijlstra
2017-10-03 9:29 ` Dietmar Eggemann [this message]
2017-10-03 12:26 ` Dietmar Eggemann
2017-09-01 13:21 ` [PATCH -v2 14/18] sched/fair: Synchonous PELT detach on load-balance migrate Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 15/18] sched/fair: Align PELT windows between cfs_rq and its se Peter Zijlstra
2017-10-04 19:27 ` Dietmar Eggemann
2017-10-06 13:02 ` Peter Zijlstra
2017-10-09 12:15 ` Dietmar Eggemann
2017-10-09 12:19 ` Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 16/18] sched/fair: More accurate async detach Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 17/18] sched/fair: Calculate runnable_weight slightly differently Peter Zijlstra
2017-09-01 13:21 ` [PATCH -v2 18/18] sched/fair: Update calc_group_*() comments Peter Zijlstra
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