This patch removes the per-subsystem hotcpu mutexes from sched and
slab subsystems.
Signed-off-by : Gautham R Shenoy <[email protected]>
--
kernel/sched.c | 16 ----------------
mm/slab.c | 6 ------
2 files changed, 22 deletions(-)
Index: hotplug/kernel/sched.c
===================================================================
--- hotplug.orig/kernel/sched.c
+++ hotplug/kernel/sched.c
@@ -280,7 +280,6 @@ struct rq {
};
static DEFINE_PER_CPU(struct rq, runqueues);
-static DEFINE_MUTEX(sched_hotcpu_mutex);
static inline int cpu_of(struct rq *rq)
{
@@ -4454,13 +4453,11 @@ long sched_setaffinity(pid_t pid, cpumas
struct task_struct *p;
int retval;
- mutex_lock(&sched_hotcpu_mutex);
read_lock(&tasklist_lock);
p = find_process_by_pid(pid);
if (!p) {
read_unlock(&tasklist_lock);
- mutex_unlock(&sched_hotcpu_mutex);
return -ESRCH;
}
@@ -4487,7 +4484,6 @@ long sched_setaffinity(pid_t pid, cpumas
out_unlock:
put_task_struct(p);
- mutex_unlock(&sched_hotcpu_mutex);
return retval;
}
@@ -4544,7 +4540,6 @@ long sched_getaffinity(pid_t pid, cpumas
struct task_struct *p;
int retval;
- mutex_lock(&sched_hotcpu_mutex);
read_lock(&tasklist_lock);
retval = -ESRCH;
@@ -4560,7 +4555,6 @@ long sched_getaffinity(pid_t pid, cpumas
out_unlock:
read_unlock(&tasklist_lock);
- mutex_unlock(&sched_hotcpu_mutex);
if (retval)
return retval;
@@ -5483,9 +5477,6 @@ migration_call(struct notifier_block *nf
struct rq *rq;
switch (action) {
- case CPU_LOCK_ACQUIRE:
- mutex_lock(&sched_hotcpu_mutex);
- break;
case CPU_UP_PREPARE:
p = kthread_create(migration_thread, hcpu, "migration/%d",cpu);
@@ -5549,9 +5540,6 @@ migration_call(struct notifier_block *nf
rq->migration_thread = NULL;
break;
#endif
- case CPU_LOCK_RELEASE:
- mutex_unlock(&sched_hotcpu_mutex);
- break;
}
return NOTIFY_OK;
}
@@ -6895,10 +6883,8 @@ int arch_reinit_sched_domains(void)
{
int err;
- mutex_lock(&sched_hotcpu_mutex);
detach_destroy_domains(&cpu_online_map);
err = arch_init_sched_domains(&cpu_online_map);
- mutex_unlock(&sched_hotcpu_mutex);
return err;
}
@@ -7003,12 +6989,10 @@ void __init sched_init_smp(void)
{
cpumask_t non_isolated_cpus;
- mutex_lock(&sched_hotcpu_mutex);
arch_init_sched_domains(&cpu_online_map);
cpus_andnot(non_isolated_cpus, cpu_possible_map, cpu_isolated_map);
if (cpus_empty(non_isolated_cpus))
cpu_set(smp_processor_id(), non_isolated_cpus);
- mutex_unlock(&sched_hotcpu_mutex);
/* XXX: Theoretical race here - CPU may be hotplugged now */
hotcpu_notifier(update_sched_domains, 0);
Index: hotplug/mm/slab.c
===================================================================
--- hotplug.orig/mm/slab.c
+++ hotplug/mm/slab.c
@@ -1179,9 +1179,6 @@ static int __cpuinit cpuup_callback(stru
int memsize = sizeof(struct kmem_list3);
switch (action) {
- case CPU_LOCK_ACQUIRE:
- mutex_lock(&cache_chain_mutex);
- break;
case CPU_UP_PREPARE:
/*
* We need to do this right in the beginning since
@@ -1342,9 +1339,6 @@ free_array_cache:
drain_freelist(cachep, l3, l3->free_objects);
}
break;
- case CPU_LOCK_RELEASE:
- mutex_unlock(&cache_chain_mutex);
- break;
}
return NOTIFY_OK;
bad:
--
Gautham R Shenoy
Linux Technology Center
IBM India.
"Freedom comes with a price tag of responsibility, which is still a bargain,
because Freedom is priceless!"
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