drain_all_stock

Name:Drains all per-CPU charge caches for given root_memcg resp. subtree* of the hierarchy under it.

Proto:static void drain_all_stock(struct mem_cgroup *root_memcg)

Type:void

Parameter:

Type	Parameter	Name
struct mem_cgroup *	root_memcg

2145

If Not mutex_trylock - try to acquire the mutex, without waiting*@lock: the mutex to be acquired* Try to acquire the mutex atomically Then Return

2153

curcpu = get_cpu()

2154

for_each_online_cpu(cpu)

2155

stock = per_cpu(memcg_stock, cpu)

2157

bool flush = false

2159

_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

2160

memcg = this never be root cgroup

2161

If memcg && nr_pages && mem_cgroup_is_descendant(memcg, root_memcg) Then flush = true

2164

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

2166

If flush && Not st_and_set_bit - Set a bit and return its old value*@nr: Bit to set*@addr: Address to count from* This is an atomic fully-ordered operation (implied full memory barrier). Then

2168

If cpu == curcpu Then drain_local_stock( & work)

2170

Else schedule_work_on - put work task on a specific cpu*@cpu: cpu to put the work task on*@work: job to be done* This puts a job on a specific cpu

2174

2175

mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.

**Caller**
Name	Describe
try_charge
mem_cgroup_resize_max
mem_cgroup_force_empty	Reclaims as many pages from the given memcg as possible.* Caller is responsible for holding css reference for memcg.
mem_cgroup_css_offline
memory_high_write
memory_max_write

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