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cpuset: introduce CS_ONLINE 

Add CS_ONLINE which is set from css_online() and cleared from
css_offline().  This will enable using generic cgroup iterator while
allowing decoupling cpuset from cgroup internal locking.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2013-01-07 08:51:07 -08:00
parent c8f699bb56
commit efeb77b2f1
1 changed files with 10 additions and 1 deletions
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11
kernel/cpuset.c
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@ -138,6 +138,7 @@ static inline bool task_has_mempolicy(struct task_struct *task)
/* bits in struct cpuset flags field */
typedef enum {
CS_ONLINE,
CS_CPU_EXCLUSIVE,
CS_MEM_EXCLUSIVE,
CS_MEM_HARDWALL,
@ -154,6 +155,11 @@ enum hotplug_event {
};
/* convenient tests for these bits */
static inline bool is_cpuset_online(const struct cpuset *cs)
{
return test_bit(CS_ONLINE, &cs->flags);
}
static inline int is_cpu_exclusive(const struct cpuset *cs)
{
return test_bit(CS_CPU_EXCLUSIVE, &cs->flags);
@ -190,7 +196,8 @@ static inline int is_spread_slab(const struct cpuset *cs)
}
static struct cpuset top_cpuset = {
.flags = ((1 << CS_CPU_EXCLUSIVE) | (1 << CS_MEM_EXCLUSIVE)),
.flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
(1 << CS_MEM_EXCLUSIVE)),
};
/*
@ -1822,6 +1829,7 @@ static int cpuset_css_online(struct cgroup *cgrp)
if (!parent)
return 0;
set_bit(CS_ONLINE, &cs->flags);
if (is_spread_page(parent))
set_bit(CS_SPREAD_PAGE, &cs->flags);
if (is_spread_slab(parent))
@ -1871,6 +1879,7 @@ static void cpuset_css_offline(struct cgroup *cgrp)
update_flag(CS_SCHED_LOAD_BALANCE, cs, 0);
number_of_cpusets--;
clear_bit(CS_ONLINE, &cs->flags);
cgroup_unlock();
}