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enable 4.19.x-rt with preempt-rt Linux 4.19.15

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Signed-off-by: Tiejun Chen <tiejun.china@gmail.com>
This commit is contained in:
Tiejun Chen
2019-03-04 13:41:59 -08:00
parent daab1a1ecc
commit 92ebe10a62
269 changed files with 32215 additions and 1 deletions
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85
kernel/patches-4.19.x-rt/0108-sched-delay-put-task.patch Normal file
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@@ -0,0 +1,85 @@
Subject: sched: Move task_struct cleanup to RCU
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 31 May 2011 16:59:16 +0200
__put_task_struct() does quite some expensive work. We don't want to
burden random tasks with that.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/sched.h | 3 +++
include/linux/sched/task.h | 11 ++++++++++-
kernel/fork.c | 15 ++++++++++++++-
3 files changed, 27 insertions(+), 2 deletions(-)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1186,6 +1186,9 @@ struct task_struct {
unsigned int sequential_io;
unsigned int sequential_io_avg;
#endif
+#ifdef CONFIG_PREEMPT_RT_BASE
+ struct rcu_head put_rcu;
+#endif
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
unsigned long task_state_change;
#endif
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -88,6 +88,15 @@ extern void sched_exec(void);
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
+#ifdef CONFIG_PREEMPT_RT_BASE
+extern void __put_task_struct_cb(struct rcu_head *rhp);
+
+static inline void put_task_struct(struct task_struct *t)
+{
+ if (atomic_dec_and_test(&t->usage))
+ call_rcu(&t->put_rcu, __put_task_struct_cb);
+}
+#else
extern void __put_task_struct(struct task_struct *t);
static inline void put_task_struct(struct task_struct *t)
@@ -95,7 +104,7 @@ static inline void put_task_struct(struc
if (atomic_dec_and_test(&t->usage))
__put_task_struct(t);
}
-
+#endif
struct task_struct *task_rcu_dereference(struct task_struct **ptask);
#ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -671,7 +671,9 @@ static inline void put_signal_struct(str
if (atomic_dec_and_test(&sig->sigcnt))
free_signal_struct(sig);
}
-
+#ifdef CONFIG_PREEMPT_RT_BASE
+static
+#endif
void __put_task_struct(struct task_struct *tsk)
{
WARN_ON(!tsk->exit_state);
@@ -688,7 +690,18 @@ void __put_task_struct(struct task_struc
if (!profile_handoff_task(tsk))
free_task(tsk);
}
+#ifndef CONFIG_PREEMPT_RT_BASE
EXPORT_SYMBOL_GPL(__put_task_struct);
+#else
+void __put_task_struct_cb(struct rcu_head *rhp)
+{
+ struct task_struct *tsk = container_of(rhp, struct task_struct, put_rcu);
+
+ __put_task_struct(tsk);
+
+}
+EXPORT_SYMBOL_GPL(__put_task_struct_cb);
+#endif
void __init __weak arch_task_cache_init(void) { }