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Subject[PATCH 04/13] cpuset: introduce CS_ONLINE
Date
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>
---
kernel/cpuset.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 70197ba..22b521d 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -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();
}
--
1.7.11.7


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