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rcutorture: Add cond_resched() to forward-progress free-up loop 

The rcu_torture_fwd_prog_cbfree() function frees callbacks used during
rcutorture's call_rcu() forward-progress test, but does so in a tight
loop.  This could cause problems given a very long list of callbacks to be
freed, and actual testing produces lists with as many as 25M callbacks.
This commit therefore adds a cond_resched() to this loop.  While in
the area, this commit also rearranges the lock releases to look a bit
more sane.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2019-04-09 10:08:18 -07:00
parent dd064c3599
commit 140e53f20b
1 changed files with 4 additions and 2 deletions
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6
kernel/rcu/rcutorture.c
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@ -1674,16 +1674,18 @@ static unsigned long rcu_torture_fwd_prog_cbfree(void)
for (;;) {
spin_lock_irqsave(&rcu_fwd_lock, flags);
rfcp = rcu_fwd_cb_head;
if (!rfcp)
if (!rfcp) {
spin_unlock_irqrestore(&rcu_fwd_lock, flags);
break;
}
rcu_fwd_cb_head = rfcp->rfc_next;
if (!rcu_fwd_cb_head)
rcu_fwd_cb_tail = &rcu_fwd_cb_head;
spin_unlock_irqrestore(&rcu_fwd_lock, flags);
kfree(rfcp);
freed++;
cond_resched();
}
spin_unlock_irqrestore(&rcu_fwd_lock, flags);
return freed;
}