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| author | Tejun Heo <tj@kernel.org> | 2024-06-26 03:29:58 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2024-07-04 15:59:52 +0200 |
| commit | d329605287020c3d1c3b0dadc63d8208e7251382 (patch) | |
| tree | 8e96bade108c8790c2f317621c616c085ad62c83 /kernel/sched | |
| parent | sched/psi: Optimise psi_group_change a bit (diff) | |
| download | linux-d329605287020c3d1c3b0dadc63d8208e7251382.tar.xz linux-d329605287020c3d1c3b0dadc63d8208e7251382.zip | |
sched/fair: set_load_weight() must also call reweight_task() for SCHED_IDLE tasks
When a task's weight is being changed, set_load_weight() is called with
@update_load set. As weight changes aren't trivial for the fair class,
set_load_weight() calls fair.c::reweight_task() for fair class tasks.
However, set_load_weight() first tests task_has_idle_policy() on entry and
skips calling reweight_task() for SCHED_IDLE tasks. This is buggy as
SCHED_IDLE tasks are just fair tasks with a very low weight and they would
incorrectly skip load, vlag and position updates.
Fix it by updating reweight_task() to take struct load_weight as idle weight
can't be expressed with prio and making set_load_weight() call
reweight_task() for SCHED_IDLE tasks too when @update_load is set.
Fixes: 9059393e4ec1 ("sched/fair: Use reweight_entity() for set_user_nice()")
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org # v4.15+
Link: http://lkml.kernel.org/r/20240624102331.GI31592@noisy.programming.kicks-ass.net
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 23 | ||||
| -rw-r--r-- | kernel/sched/fair.c | 7 | ||||
| -rw-r--r-- | kernel/sched/sched.h | 2 |
3 files changed, 14 insertions, 18 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 0935f9d4bb7b..747683487be7 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1328,27 +1328,24 @@ int tg_nop(struct task_group *tg, void *data) void set_load_weight(struct task_struct *p, bool update_load) { int prio = p->static_prio - MAX_RT_PRIO; - struct load_weight *load = &p->se.load; + struct load_weight lw; - /* - * SCHED_IDLE tasks get minimal weight: - */ if (task_has_idle_policy(p)) { - load->weight = scale_load(WEIGHT_IDLEPRIO); - load->inv_weight = WMULT_IDLEPRIO; - return; + lw.weight = scale_load(WEIGHT_IDLEPRIO); + lw.inv_weight = WMULT_IDLEPRIO; + } else { + lw.weight = scale_load(sched_prio_to_weight[prio]); + lw.inv_weight = sched_prio_to_wmult[prio]; } /* * 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); - } else { - load->weight = scale_load(sched_prio_to_weight[prio]); - load->inv_weight = sched_prio_to_wmult[prio]; - } + if (update_load && p->sched_class == &fair_sched_class) + reweight_task(p, &lw); + else + p->se.load = lw; } #ifdef CONFIG_UCLAMP_TASK diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 41b58387023d..f205e2482690 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -3835,15 +3835,14 @@ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, } } -void reweight_task(struct task_struct *p, int prio) +void reweight_task(struct task_struct *p, const struct load_weight *lw) { struct sched_entity *se = &p->se; struct cfs_rq *cfs_rq = cfs_rq_of(se); struct load_weight *load = &se->load; - unsigned long weight = scale_load(sched_prio_to_weight[prio]); - reweight_entity(cfs_rq, se, weight); - load->inv_weight = sched_prio_to_wmult[prio]; + reweight_entity(cfs_rq, se, lw->weight); + load->inv_weight = lw->inv_weight; } static inline int throttled_hierarchy(struct cfs_rq *cfs_rq); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 62fd8bc6fd08..9ab53435debd 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2509,7 +2509,7 @@ 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 reweight_task(struct task_struct *p, const struct load_weight *lw); extern void resched_curr(struct rq *rq); extern void resched_cpu(int cpu); |