diff options
Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0009-sched-Massage-set_cpus_allowed.patch | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/debian/patches-rt/0009-sched-Massage-set_cpus_allowed.patch b/debian/patches-rt/0009-sched-Massage-set_cpus_allowed.patch new file mode 100644 index 000000000..24fc3200e --- /dev/null +++ b/debian/patches-rt/0009-sched-Massage-set_cpus_allowed.patch @@ -0,0 +1,175 @@ +From 1125b34b63aa303af592b0ea5be730dc92ce6d53 Mon Sep 17 00:00:00 2001 +From: Peter Zijlstra <peterz@infradead.org> +Date: Fri, 23 Oct 2020 12:12:06 +0200 +Subject: [PATCH 009/323] sched: Massage set_cpus_allowed() +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +Thread a u32 flags word through the *set_cpus_allowed*() callchain. +This will allow adding behavioural tweaks for future users. + +Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + kernel/sched/core.c | 28 ++++++++++++++++++---------- + kernel/sched/deadline.c | 5 +++-- + kernel/sched/sched.h | 7 +++++-- + 3 files changed, 26 insertions(+), 14 deletions(-) + +diff --git a/kernel/sched/core.c b/kernel/sched/core.c +index c5d5576c67fb..569cc5e48e68 100644 +--- a/kernel/sched/core.c ++++ b/kernel/sched/core.c +@@ -1838,13 +1838,14 @@ static int migration_cpu_stop(void *data) + * sched_class::set_cpus_allowed must do the below, but is not required to + * actually call this function. + */ +-void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask) ++void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask, u32 flags) + { + cpumask_copy(&p->cpus_mask, new_mask); + p->nr_cpus_allowed = cpumask_weight(new_mask); + } + +-void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) ++static void ++__do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask, u32 flags) + { + struct rq *rq = task_rq(p); + bool queued, running; +@@ -1865,7 +1866,7 @@ void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) + if (running) + put_prev_task(rq, p); + +- p->sched_class->set_cpus_allowed(p, new_mask); ++ p->sched_class->set_cpus_allowed(p, new_mask, flags); + + if (queued) + enqueue_task(rq, p, ENQUEUE_RESTORE | ENQUEUE_NOCLOCK); +@@ -1873,6 +1874,11 @@ void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) + set_next_task(rq, p); + } + ++void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) ++{ ++ __do_set_cpus_allowed(p, new_mask, 0); ++} ++ + /* + * Change a given task's CPU affinity. Migrate the thread to a + * proper CPU and schedule it away if the CPU it's executing on +@@ -1883,7 +1889,8 @@ void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) + * call is not atomic; no spinlocks may be held. + */ + static int __set_cpus_allowed_ptr(struct task_struct *p, +- const struct cpumask *new_mask, bool check) ++ const struct cpumask *new_mask, ++ u32 flags) + { + const struct cpumask *cpu_valid_mask = cpu_active_mask; + unsigned int dest_cpu; +@@ -1905,7 +1912,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p, + * Must re-check here, to close a race against __kthread_bind(), + * sched_setaffinity() is not guaranteed to observe the flag. + */ +- if (check && (p->flags & PF_NO_SETAFFINITY)) { ++ if ((flags & SCA_CHECK) && (p->flags & PF_NO_SETAFFINITY)) { + ret = -EINVAL; + goto out; + } +@@ -1924,7 +1931,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p, + goto out; + } + +- do_set_cpus_allowed(p, new_mask); ++ __do_set_cpus_allowed(p, new_mask, flags); + + if (p->flags & PF_KTHREAD) { + /* +@@ -1961,7 +1968,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p, + + int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask) + { +- return __set_cpus_allowed_ptr(p, new_mask, false); ++ return __set_cpus_allowed_ptr(p, new_mask, 0); + } + EXPORT_SYMBOL_GPL(set_cpus_allowed_ptr); + +@@ -2420,7 +2427,8 @@ void sched_set_stop_task(int cpu, struct task_struct *stop) + #else + + static inline int __set_cpus_allowed_ptr(struct task_struct *p, +- const struct cpumask *new_mask, bool check) ++ const struct cpumask *new_mask, ++ u32 flags) + { + return set_cpus_allowed_ptr(p, new_mask); + } +@@ -6022,7 +6030,7 @@ long sched_setaffinity(pid_t pid, const struct cpumask *in_mask) + } + #endif + again: +- retval = __set_cpus_allowed_ptr(p, new_mask, true); ++ retval = __set_cpus_allowed_ptr(p, new_mask, SCA_CHECK); + + if (!retval) { + cpuset_cpus_allowed(p, cpus_allowed); +@@ -6598,7 +6606,7 @@ void __init init_idle(struct task_struct *idle, int cpu) + * + * And since this is boot we can forgo the serialization. + */ +- set_cpus_allowed_common(idle, cpumask_of(cpu)); ++ set_cpus_allowed_common(idle, cpumask_of(cpu), 0); + #endif + /* + * We're having a chicken and egg problem, even though we are +diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c +index af8569dbdc9c..5566f157640b 100644 +--- a/kernel/sched/deadline.c ++++ b/kernel/sched/deadline.c +@@ -2311,7 +2311,8 @@ static void task_woken_dl(struct rq *rq, struct task_struct *p) + } + + static void set_cpus_allowed_dl(struct task_struct *p, +- const struct cpumask *new_mask) ++ const struct cpumask *new_mask, ++ u32 flags) + { + struct root_domain *src_rd; + struct rq *rq; +@@ -2340,7 +2341,7 @@ static void set_cpus_allowed_dl(struct task_struct *p, + raw_spin_unlock(&src_dl_b->lock); + } + +- set_cpus_allowed_common(p, new_mask); ++ set_cpus_allowed_common(p, new_mask, flags); + } + + /* Assumes rq->lock is held */ +diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h +index a72464d370cd..f0f396cc1bee 100644 +--- a/kernel/sched/sched.h ++++ b/kernel/sched/sched.h +@@ -1818,7 +1818,8 @@ struct sched_class { + void (*task_woken)(struct rq *this_rq, struct task_struct *task); + + void (*set_cpus_allowed)(struct task_struct *p, +- const struct cpumask *newmask); ++ const struct cpumask *newmask, ++ u32 flags); + + void (*rq_online)(struct rq *rq); + void (*rq_offline)(struct rq *rq); +@@ -1911,7 +1912,9 @@ extern void update_group_capacity(struct sched_domain *sd, int cpu); + + extern void trigger_load_balance(struct rq *rq); + +-extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask); ++#define SCA_CHECK 0x01 ++ ++extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask, u32 flags); + + #endif + +-- +2.43.0 + |