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Commit efeb77b2 authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
parent c8f699bb

kernel/cpuset.c

+10 −1
Original line number Diff line number Diff line
@@ -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();

}