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| author | Paul Gortmaker <paul.gortmaker@windriver.com> | 2016-09-03 17:28:30 -0400 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2016-09-03 17:28:30 -0400 |
| commit | 38e40ecf914a7683ad03c2c611f4889ce691bfea (patch) | |
| tree | c374a2fad430147fb2f9318f50a15893934786c6 | |
| parent | 36bc8c231f1512cb69b941baac68b357284ca702 (diff) | |
| download | 4.8-rt-patches-38e40ecf914a7683ad03c2c611f4889ce691bfea.tar.gz | |
rcu: task struct refresh ; trivial refreshrt-v4.7-1266-gcca08cd66ce6
| -rw-r--r-- | patches/sched-delay-put-task.patch | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/patches/sched-delay-put-task.patch b/patches/sched-delay-put-task.patch index eb42239a7335c..a10c438d29bd3 100644 --- a/patches/sched-delay-put-task.patch +++ b/patches/sched-delay-put-task.patch @@ -1,19 +1,18 @@ -Subject: sched: Move task_struct cleanup to RCU +From 0916016697817bc316440bc42062ee6aeb2ba8a1 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner <tglx@linutronix.de> Date: Tue, 31 May 2011 16:59:16 +0200 +Subject: [PATCH] sched: Move task_struct cleanup to RCU __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 | 13 +++++++++++++ - kernel/fork.c | 15 ++++++++++++++- - 2 files changed, 27 insertions(+), 1 deletion(-) +diff --git a/include/linux/sched.h b/include/linux/sched.h +index 2028d3fba470..74994e849280 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h -@@ -1865,6 +1865,9 @@ struct task_struct { +@@ -1932,6 +1932,9 @@ struct task_struct { unsigned int sequential_io; unsigned int sequential_io_avg; #endif @@ -23,7 +22,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de> #ifdef CONFIG_DEBUG_ATOMIC_SLEEP unsigned long task_state_change; #endif -@@ -2077,6 +2080,15 @@ extern struct pid *cad_pid; +@@ -2144,6 +2147,15 @@ extern struct pid *cad_pid; extern void free_task(struct task_struct *tsk); #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) @@ -39,17 +38,19 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de> extern void __put_task_struct(struct task_struct *t); static inline void put_task_struct(struct task_struct *t) -@@ -2084,6 +2096,7 @@ static inline void put_task_struct(struc +@@ -2151,6 +2163,7 @@ static inline void put_task_struct(struct task_struct *t) if (atomic_dec_and_test(&t->usage)) __put_task_struct(t); } +#endif - #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN - extern void task_cputime(struct task_struct *t, + struct task_struct *task_rcu_dereference(struct task_struct **ptask); + struct task_struct *try_get_task_struct(struct task_struct **ptask); +diff --git a/kernel/fork.c b/kernel/fork.c +index f5b0568ef142..076d00b402c4 100644 --- a/kernel/fork.c +++ b/kernel/fork.c -@@ -253,7 +253,9 @@ static inline void put_signal_struct(str +@@ -253,7 +253,9 @@ static inline void put_signal_struct(struct signal_struct *sig) if (atomic_dec_and_test(&sig->sigcnt)) free_signal_struct(sig); } @@ -60,7 +61,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de> void __put_task_struct(struct task_struct *tsk) { WARN_ON(!tsk->exit_state); -@@ -270,7 +272,18 @@ void __put_task_struct(struct task_struc +@@ -270,7 +272,18 @@ void __put_task_struct(struct task_struct *tsk) if (!profile_handoff_task(tsk)) free_task(tsk); } @@ -79,3 +80,6 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de> void __init __weak arch_task_cache_init(void) { } +-- +2.5.0 + |