From: Vincent Guittot <vincent.guittot@linaro.org>
To: Rik van Riel <riel@surriel.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Kernel Team <kernel-team@fb.com>, Paul Turner <pjt@google.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Mel Gorman <mgorman@techsingularity.net>
Subject: Re: [PATCH 09/15] sched,fair: refactor enqueue/dequeue_entity
Date: Wed, 4 Sep 2019 08:44:39 +0200 [thread overview]
Message-ID: <CAKfTPtDbpd_FgPX21QDLSm=S7FL9z2HbS2b96aGOTAUw_bcxmg@mail.gmail.com> (raw)
In-Reply-To: <6d07046810f4a490960d0124e99fe9cf546e9d10.camel@surriel.com>
On Tue, 3 Sep 2019 at 22:27, Rik van Riel <riel@surriel.com> wrote:
>
> On Tue, 2019-09-03 at 17:38 +0200, Vincent Guittot wrote:
> > Hi Rik,
> >
> > On Thu, 22 Aug 2019 at 04:18, Rik van Riel <riel@surriel.com> wrote:
> > > Refactor enqueue_entity, dequeue_entity, and update_load_avg, in
> > > order
> > > to split out the things we still want to happen at every level in
> > > the
> > > cgroup hierarchy with a flat runqueue from the things we only need
> > > to
> > > happen once.
> > >
> > > No functional changes.
> > >
> > > Signed-off-by: Rik van Riel <riel@surriel.com>
> > > ---
> > > kernel/sched/fair.c | 64 +++++++++++++++++++++++++++++----------
> > > ------
> > > 1 file changed, 42 insertions(+), 22 deletions(-)
> > >
> > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> > > index 74ee22c59d13..7b0d95f2e3a8 100644
> > > --- a/kernel/sched/fair.c
> > > +++ b/kernel/sched/fair.c
> > > @@ -3502,7 +3502,7 @@ static void detach_entity_load_avg(struct
> > > cfs_rq *cfs_rq, struct sched_entity *s
> > > #define DO_ATTACH 0x4
> > >
> > > /* Update task and its cfs_rq load average */
> > > -static inline void update_load_avg(struct cfs_rq *cfs_rq, struct
> > > sched_entity *se, int flags)
> > > +static inline bool update_load_avg(struct cfs_rq *cfs_rq, struct
> > > sched_entity *se, int flags)
> > > {
> > > u64 now = cfs_rq_clock_pelt(cfs_rq);
> > > int decayed;
> > > @@ -3531,6 +3531,8 @@ static inline void update_load_avg(struct
> > > cfs_rq *cfs_rq, struct sched_entity *s
> > >
> > > } else if (decayed && (flags & UPDATE_TG))
> > > update_tg_load_avg(cfs_rq, 0);
> > > +
> > > + return decayed;
> >
> > This is a functional change, isn't it ?
> > update_cfs_group is now called only if decayed but we can we attach a
> > task during the enqueue and there is no decay
>
> Yes, it is, and patch 11 changes the way this functional
> change is done.
>
> If you want, I can change this patch to not have the
> functional change, though in the end it should not make
> any difference.
It's mainly that the code is not aligned with the commit message
I will continue to review other patch and will come back to this one
after reviewing patch 11
Thanks
Vincent
>
> --
> All Rights Reversed.
next prev parent reply other threads:[~2019-09-04 6:44 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-22 2:17 [PATCH RFC v4 0/15] sched,fair: flatten CPU controller runqueues Rik van Riel
2019-08-22 2:17 ` [PATCH 01/15] sched: introduce task_se_h_load helper Rik van Riel
2019-08-23 18:13 ` Dietmar Eggemann
2019-08-24 0:05 ` Rik van Riel
2019-08-22 2:17 ` [PATCH 02/15] sched: change /proc/sched_debug fields Rik van Riel
2019-08-22 2:17 ` [PATCH 03/15] sched,fair: redefine runnable_load_avg as the sum of task_h_load Rik van Riel
2019-08-28 13:50 ` Vincent Guittot
2019-08-28 14:47 ` Rik van Riel
2019-08-28 15:02 ` Vincent Guittot
2019-08-22 2:17 ` [PATCH 04/15] sched,fair: move runnable_load_avg to cfs_rq Rik van Riel
2019-08-22 2:17 ` [PATCH 05/15] sched,fair: remove cfs_rqs from leaf_cfs_rq_list bottom up Rik van Riel
2019-08-28 14:09 ` Vincent Guittot
2019-08-22 2:17 ` [PATCH 06/15] sched,cfs: use explicit cfs_rq of parent se helper Rik van Riel
2019-08-28 13:53 ` Vincent Guittot
2019-08-28 15:28 ` Rik van Riel
2019-08-28 16:34 ` Vincent Guittot
2019-08-22 2:17 ` [PATCH 07/15] sched,cfs: fix zero length timeslice calculation Rik van Riel
2019-08-28 16:59 ` Vincent Guittot
2019-08-22 2:17 ` [PATCH 08/15] sched,fair: simplify timeslice length code Rik van Riel
2019-08-28 17:32 ` Vincent Guittot
2019-08-28 23:18 ` Rik van Riel
2019-08-29 14:02 ` Vincent Guittot
2019-08-29 16:00 ` Rik van Riel
2019-08-30 6:41 ` Vincent Guittot
2019-08-30 15:01 ` Rik van Riel
2019-09-02 7:51 ` Vincent Guittot
2019-09-02 17:47 ` Rik van Riel
2019-08-22 2:17 ` [PATCH 09/15] sched,fair: refactor enqueue/dequeue_entity Rik van Riel
2019-09-03 15:38 ` Vincent Guittot
2019-09-03 20:27 ` Rik van Riel
2019-09-04 6:44 ` Vincent Guittot [this message]
2019-08-22 2:17 ` [PATCH 10/15] sched,fair: add helper functions for flattened runqueue Rik van Riel
2019-08-22 2:17 ` [PATCH 11/15] sched,fair: flatten hierarchical runqueues Rik van Riel
2019-08-23 18:14 ` Dietmar Eggemann
2019-08-24 1:16 ` Rik van Riel
2019-08-22 2:17 ` [PATCH 12/15] sched,fair: flatten update_curr functionality Rik van Riel
2019-08-27 10:37 ` Dietmar Eggemann
2019-08-22 2:17 ` [PATCH 13/15] sched,fair: propagate sum_exec_runtime up the hierarchy Rik van Riel
2019-08-28 7:51 ` Dietmar Eggemann
2019-08-28 13:14 ` Rik van Riel
2019-08-29 17:20 ` Dietmar Eggemann
2019-08-29 18:06 ` Rik van Riel
2019-08-22 2:17 ` [PATCH 14/15] sched,fair: ramp up task_se_h_weight quickly Rik van Riel
2019-08-22 2:17 ` [PATCH 15/15] sched,fair: scale vdiff in wakeup_preempt_entity Rik van Riel
2019-09-02 10:53 ` [PATCH RFC v4 0/15] sched,fair: flatten CPU controller runqueues Dietmar Eggemann
2019-09-03 1:44 ` Rik van Riel
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