From d6326047576266991d88639e1e9739a9a9a20ef4 Mon Sep 17 00:00:00 2001 From: Chen Ridong Date: Wed, 24 Jul 2024 10:24:18 +0000 Subject: [PATCH] cgroup/cpuset: remove child_ecpus_count The child_ecpus_count variable was previously used to update sibling cpumask when parent's effective_cpus is updated. However, it became obsolete after commit e2ffe502ba45 ("cgroup/cpuset: Add cpuset.cpus.exclusive for v2"). It should be removed. tj: Restored {} for style consistency. Signed-off-by: Chen Ridong Acked-by: Waiman Long Signed-off-by: Tejun Heo --- kernel/cgroup/cpuset.c | 22 +++------------------- 1 file changed, 3 insertions(+), 19 deletions(-) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 40ec4abaf440..918268bc03a7 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -188,10 +188,8 @@ struct cpuset { /* * Default hierarchy only: * use_parent_ecpus - set if using parent's effective_cpus - * child_ecpus_count - # of children with use_parent_ecpus set */ int use_parent_ecpus; - int child_ecpus_count; /* * number of SCHED_DEADLINE tasks attached to this cpuset, so that we @@ -1512,7 +1510,6 @@ static void reset_partition_data(struct cpuset *cs) if (!cpumask_and(cs->effective_cpus, parent->effective_cpus, cs->cpus_allowed)) { cs->use_parent_ecpus = true; - parent->child_ecpus_count++; cpumask_copy(cs->effective_cpus, parent->effective_cpus); } } @@ -1688,12 +1685,8 @@ static int remote_partition_enable(struct cpuset *cs, int new_prs, spin_lock_irq(&callback_lock); isolcpus_updated = partition_xcpus_add(new_prs, NULL, tmp->new_cpus); list_add(&cs->remote_sibling, &remote_children); - if (cs->use_parent_ecpus) { - struct cpuset *parent = parent_cs(cs); - + if (cs->use_parent_ecpus) cs->use_parent_ecpus = false; - parent->child_ecpus_count--; - } spin_unlock_irq(&callback_lock); update_unbound_workqueue_cpumask(isolcpus_updated); @@ -2318,14 +2311,10 @@ static void update_cpumasks_hier(struct cpuset *cs, struct tmpmasks *tmp, */ if (is_in_v2_mode() && !remote && cpumask_empty(tmp->new_cpus)) { cpumask_copy(tmp->new_cpus, parent->effective_cpus); - if (!cp->use_parent_ecpus) { + if (!cp->use_parent_ecpus) cp->use_parent_ecpus = true; - parent->child_ecpus_count++; - } } else if (cp->use_parent_ecpus) { cp->use_parent_ecpus = false; - WARN_ON_ONCE(!parent->child_ecpus_count); - parent->child_ecpus_count--; } if (remote) @@ -4139,7 +4128,6 @@ static int cpuset_css_online(struct cgroup_subsys_state *css) cpumask_copy(cs->effective_cpus, parent->effective_cpus); cs->effective_mems = parent->effective_mems; cs->use_parent_ecpus = true; - parent->child_ecpus_count++; } spin_unlock_irq(&callback_lock); @@ -4205,12 +4193,8 @@ static void cpuset_css_offline(struct cgroup_subsys_state *css) is_sched_load_balance(cs)) update_flag(CS_SCHED_LOAD_BALANCE, cs, 0); - if (cs->use_parent_ecpus) { - struct cpuset *parent = parent_cs(cs); - + if (cs->use_parent_ecpus) cs->use_parent_ecpus = false; - parent->child_ecpus_count--; - } cpuset_dec(); clear_bit(CS_ONLINE, &cs->flags); -- 2.50.1