diff options
Diffstat (limited to 'debian/patches-rt/0105-sched-Move-task_struct-cleanup-to-RCU.patch')
| -rw-r--r-- | debian/patches-rt/0105-sched-Move-task_struct-cleanup-to-RCU.patch | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/debian/patches-rt/0105-sched-Move-task_struct-cleanup-to-RCU.patch b/debian/patches-rt/0105-sched-Move-task_struct-cleanup-to-RCU.patch new file mode 100644 index 000000000..8883673e8 --- /dev/null +++ b/debian/patches-rt/0105-sched-Move-task_struct-cleanup-to-RCU.patch @@ -0,0 +1,96 @@ +From 6b5806854133faa2eda014a6553665c6fa393d5e Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Tue, 31 May 2011 16:59:16 +0200 +Subject: [PATCH 105/347] sched: Move task_struct cleanup to RCU +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz + +__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(-) + +diff --git a/include/linux/sched.h b/include/linux/sched.h +index 5369eb1fd456..5e2ec9c86b4b 100644 +--- a/include/linux/sched.h ++++ b/include/linux/sched.h +@@ -1196,6 +1196,9 @@ 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 +diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h +index 91401309b1aa..5f8c1d53bc11 100644 +--- a/include/linux/sched/task.h ++++ b/include/linux/sched/task.h +@@ -90,6 +90,15 @@ 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) +@@ -97,7 +106,7 @@ static inline void put_task_struct(struct task_struct *t) + 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 +diff --git a/kernel/fork.c b/kernel/fork.c +index c27c196fd70e..f5a4c42233f0 100644 +--- a/kernel/fork.c ++++ b/kernel/fork.c +@@ -676,7 +676,9 @@ static inline void put_signal_struct(struct signal_struct *sig) + 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); +@@ -693,7 +695,18 @@ void __put_task_struct(struct task_struct *tsk) + 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) { } + +-- +2.36.1 + |