blkg_rwstat_recursive

Name:lkg_rwstat_recursive_sum - collect hierarchical blkg_rwstat*@blkg: blkg of interest*@pol: blkcg_policy which contains the blkg_rwstat*@off: offset to the blkg_rwstat in blkg_policy_data or @blkg*@sum: blkg_rwstat_sample structure containing the results*

Proto:void blkg_rwstat_recursive_sum(struct blkcg_gq *blkg, struct blkcg_policy *pol, int off, struct blkg_rwstat_sample *sum)

Type:void

Parameter:

Type	Parameter	Name
struct blkcg_gq *	blkg
struct blkcg_policy *	pol
int	off
struct blkg_rwstat_sample *	sum

110

lockdep_assert_held( & queue_lock)

112

_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

113

lkg_for_each_descendant_pre - pre-order walk of a blkg's descendants*@d_blkg: loop cursor pointing to the current descendant*@pos_css: used for iteration*@p_blkg: target blkg to walk descendants of* Walk @c_blkg through the descendants of @p_blkg(pos_blkg, pos_css, blkg)

116

If Not is this blkg online? protected by both blkcg and q locks Then Continue

119

If pol Then rwstat = lkg_to_pdata - get policy private data*@blkg: blkg of interest*@pol: policy of interest* Return pointer to private data associated with the @blkg-@pol pair. + off

121

Else rwstat = pos_blkg + off

124

When i < BLKG_RWSTAT_NR cycle cnt[i] = blkg_rwstat_read_counter(rwstat, i)

127

_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()

**Caller**
Name	Describe
tg_prfill_rwstat_recursive

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Function report