zswap_update_total_size

Name:zswap_update_total_size

Proto:static void zswap_update_total_size(void)

Type:void

Parameter:Nothing

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total = 0

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_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

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list_for_each_entry_rcu - iterate over rcu list of given type*@pos: the type * to use as a loop cursor.*@head: the head for your list.*@member: the name of the list_head within the struct.(pool, & RCU-protected iteration , list)

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total += zpool_get_total_size(zpool)

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_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()

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Total bytes used by the compressed storage = total

**Caller**
Name	Describe
zswap_free_entry	Carries out the common pattern of freeing and entry's zpool allocation,* freeing the entry itself, and decrementing the number of stored pages.
zswap_frontswap_store	attempts to compress and store an single page

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