From: Guan Jing guanjing6@huawei.com
Offering: HULK hulk inclusion category: feature bugzilla: 188161
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Add cmdline nosmtexpell to disable qos_smt_expell when we want to close.
Signed-off-by: Guan Jing guanjing6@huawei.com
Signed-off-by: Guan Jing guanjing6@huawei.com --- kernel/sched/fair.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 1503c290aa52..5267fa43bf3c 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7625,6 +7625,15 @@ static bool qos_smt_expelled(int this_cpu) #endif
#ifdef CONFIG_QOS_SCHED_SMT_EXPELLER +DEFINE_STATIC_KEY_TRUE(qos_smt_expell_switch); + +static int __init qos_sched_smt_noexpell_setup(char *__unused) +{ + static_branch_disable(&qos_smt_expell_switch); + return 1; +} +__setup("nosmtexpell", qos_sched_smt_noexpell_setup); + static bool qos_smt_check_siblings_status(int this_cpu) { int cpu; @@ -7653,6 +7662,9 @@ static bool qos_sched_idle_cpu(int this_cpu)
static bool qos_smt_expelled(int this_cpu) { + if (!static_branch_likely(&qos_smt_expell_switch)) + return false; + /* * The qos_smt_status of siblings cpu is online, and current cpu only has * offline tasks enqueued, there is not suitable task, @@ -7709,15 +7721,29 @@ static void qos_smt_send_ipi(int this_cpu)
static void qos_smt_expel(int this_cpu, struct task_struct *p) { + if (!static_branch_likely(&qos_smt_expell_switch)) + return; + if (qos_smt_update_status(p)) qos_smt_send_ipi(this_cpu); }
+static inline bool qos_smt_enabled(void) +{ + if (!static_branch_likely(&qos_smt_expell_switch)) + return false; + + if (!sched_smt_active()) + return false; + + return true; +} + static bool _qos_smt_check_need_resched(int this_cpu, struct rq *rq) { int cpu;
- if (!sched_smt_active()) + if (!qos_smt_enabled()) return false;
for_each_cpu(cpu, cpu_smt_mask(this_cpu)) {