thread_group_cputime

Name:Accumulate raw cputime values of dead tasks (sig->[us]time) and live* tasks (sum on group iteration) belonging to @tsk's group.

Proto:void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)

Type:void

Parameter:

Type	Parameter	Name
struct task_struct *	tsk
struct task_cputime *	times

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sig = Signal handlers:

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If same_thread_group(current process, tsk) Then Return accounted runtime for the task.* In case the task is currently running, return the runtime plus current's* pending runtime that have not been accounted yet.

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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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nextseq = 0

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Do

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flags = read_seqbegin_or_lock_irqsave( & Cumulative resource counters for dead threads in the group,* and for reaped dead child processes forked by this group.* Live threads maintain their own counters and add to these* in __exit_signal, except for the group leader., & seq)

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sum_exec_runtime = Cumulative ns of schedule CPU time fo dead threads in the* group, not including a zombie group leader, (This only differs* from jiffies_to_ns(utime + stime) if sched_clock uses something* other than jiffies.)

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for_each_thread(tsk, t)

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task_cputime(t, & utime, & stime)

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sum_exec_runtime += read_sum_exec_runtime(t)

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nextseq = 1

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When need_seqretry( & Cumulative resource counters for dead threads in the group,* and for reaped dead child processes forked by this group.* Live threads maintain their own counters and add to these* in __exit_signal, except for the group leader., seq) cycle

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done_seqretry_irqrestore( & Cumulative resource counters for dead threads in the group,* and for reaped dead child processes forked by this group.* Live threads maintain their own counters and add to these* in __exit_signal, except for the group leader., seq, flags)

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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()

**Caller**
Name	Describe
thread_group_cputime_adjusted
thread_group_start_cputime	hread_group_start_cputime - Start cputime and return a sample@tsk: Task for which cputime needs to be started@samples: Storage for time samples* The thread group cputime accouting is avoided when there are no posix* CPU timers armed
__thread_group_cputime

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