* [tip: core/rcu] rcutorture: Make in-kernel-loop testing more brutal
@ 2019-10-31 11:55 tip-bot2 for Paul E. McKenney
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From: tip-bot2 for Paul E. McKenney @ 2019-10-31 11:55 UTC (permalink / raw)
To: linux-tip-commits
Cc: Paul E. McKenney, Ingo Molnar, Borislav Petkov, linux-kernel
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: fbbd5e358cecb5fa490550ace66463517a7577e8
Gitweb: https://git.kernel.org/tip/fbbd5e358cecb5fa490550ace66463517a7577e8
Author: Paul E. McKenney <paulmck@kernel.org>
AuthorDate: Thu, 15 Aug 2019 11:43:53 -07:00
Committer: Paul E. McKenney <paulmck@kernel.org>
CommitterDate: Sat, 05 Oct 2019 11:50:18 -07:00
rcutorture: Make in-kernel-loop testing more brutal
The rcu_torture_fwd_prog_nr() tests the ability of RCU to tolerate
in-kernel busy loops. It invokes rcu_torture_fwd_prog_cond_resched()
within its delay loop, which, in PREEMPT && NO_HZ_FULL kernels results
in the occasional direct call to schedule(). Now, this direct call to
schedule() is appropriate for call_rcu() flood testing, in which either
the kernel should restrain itself or userspace transitions will supply
the needed restraint. But in pure in-kernel loops, the occasional
cond_resched() should do the job.
This commit therefore makes rcu_torture_fwd_prog_nr() use cond_resched()
instead of rcu_torture_fwd_prog_cond_resched() in order to increase the
brutality of this aspect of rcutorture testing.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/rcutorture.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 5ac4672..df1caa9 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1806,7 +1806,7 @@ static void rcu_torture_fwd_prog_nr(int *tested, int *tested_tries)
udelay(10);
cur_ops->readunlock(idx);
if (!fwd_progress_need_resched || need_resched())
- rcu_torture_fwd_prog_cond_resched(1);
+ cond_resched();
}
(*tested_tries)++;
if (!time_before(jiffies, stopat) &&
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