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Message-Id: <20230128001639.3510083-6-tj@kernel.org> Date: Fri, 27 Jan 2023 14:16:14 -1000 From: Tejun Heo <tj@...nel.org> To: torvalds@...ux-foundation.org, mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com, vincent.guittot@...aro.org, dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com, ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, martin.lau@...nel.org, joshdon@...gle.com, brho@...gle.com, pjt@...gle.com, derkling@...gle.com, haoluo@...gle.com, dvernet@...a.com, dschatzberg@...a.com, dskarlat@...cmu.edu, riel@...riel.com Cc: linux-kernel@...r.kernel.org, bpf@...r.kernel.org, kernel-team@...a.com, Tejun Heo <tj@...nel.org> Subject: [PATCH 05/30] sched: Add sched_class->reweight_task() Currently, during a task weight change, sched core directly calls reweight_task() defined in fair.c if @p is on CFS. Let's make it a proper sched_class operation instead. CFS's reweight_task() is renamed to reweight_task_fair() and now called through sched_class. While it turns a direct call into an indirect one, set_load_weight() isn't called from a hot path and this change shouldn't cause any noticeable difference. This will be used to implement reweight_task for a new BPF extensible sched_class so that it can keep its cached task weight up-to-date. This will be used by a new sched_class to track weight changes. Signed-off-by: Tejun Heo <tj@...nel.org> Reviewed-by: David Vernet <dvernet@...a.com> Acked-by: Josh Don <joshdon@...gle.com> Acked-by: Hao Luo <haoluo@...gle.com> Acked-by: Barret Rhoden <brho@...gle.com> --- kernel/sched/core.c | 4 ++-- kernel/sched/fair.c | 3 ++- kernel/sched/sched.h | 4 ++-- 3 files changed, 6 insertions(+), 5 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 49b3d8ce84ca..ce27ed857975 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1275,8 +1275,8 @@ static void set_load_weight(struct task_struct *p, bool update_load) * SCHED_OTHER tasks have to update their load when changing their * weight */ - if (update_load && p->sched_class == &fair_sched_class) { - reweight_task(p, prio); + if (update_load && p->sched_class->reweight_task) { + p->sched_class->reweight_task(task_rq(p), p, prio); } else { load->weight = scale_load(sched_prio_to_weight[prio]); load->inv_weight = sched_prio_to_wmult[prio]; diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index c36aa54ae071..fbedf99ed953 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -3342,7 +3342,7 @@ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, } -void reweight_task(struct task_struct *p, int prio) +static void reweight_task_fair(struct rq *rq, struct task_struct *p, int prio) { struct sched_entity *se = &p->se; struct cfs_rq *cfs_rq = cfs_rq_of(se); @@ -12413,6 +12413,7 @@ DEFINE_SCHED_CLASS(fair) = { .task_tick = task_tick_fair, .task_fork = task_fork_fair, + .reweight_task = reweight_task_fair, .prio_changed = prio_changed_fair, .switched_from = switched_from_fair, .switched_to = switched_to_fair, diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 771f8ddb7053..070603f00470 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2208,6 +2208,8 @@ struct sched_class { */ void (*switched_from)(struct rq *this_rq, struct task_struct *task); void (*switched_to) (struct rq *this_rq, struct task_struct *task); + void (*reweight_task)(struct rq *this_rq, struct task_struct *task, + int newprio); void (*prio_changed) (struct rq *this_rq, struct task_struct *task, int oldprio); @@ -2360,8 +2362,6 @@ extern void init_sched_dl_class(void); extern void init_sched_rt_class(void); extern void init_sched_fair_class(void); -extern void reweight_task(struct task_struct *p, int prio); - extern void resched_curr(struct rq *rq); extern void resched_cpu(int cpu); -- 2.39.1
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