[PATCH] fill_tgid: cleanup delays accounting

fill_tgid() should skip not only an already exited group leader. If the
task has ->exit_state != 0 it already did exit_notify(), so it also did
fill_tgid_exit()->delayacct_add_tsk(->signal->stats) and we should skip it
to avoid a double accounting.

This patch doesn't close the race completely, but it cleanups the code.

Signed-off-by: Oleg Nesterov <[e-mail]>
Cc: Shailabh Nagar <[e-mail]>
Cc: Balbir Singh <[e-mail]>
Cc: Jay Lan <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

kernel/taskstats.c

···
 
 	tsk = first;
 	do {
-		if (tsk->exit_state == EXIT_ZOMBIE && thread_group_leader(tsk))
+		if (tsk->exit_state)
 			continue;
 		/*
 		 * Accounting subsystem can call its functions here to