On 2025-03-31 14:03:06 [-0700], Paul E. McKenney wrote: > The torture.sh --do-rt command-line parameter is intended to mimic -rt > kernels. Now that CONFIG_PREEMPT_RT is upstream, this commit makes this > mimicking more precise. > > Note that testing of RCU priority boosting is disabled in favor > of forward-progress testing of RCU callbacks. If it turns out to be > possible to make kernels built with CONFIG_PREEMPT_RT=y to tolerate > testing of both, both will be enabled.
Not sure what you point at here: You can build a PREEMPT_RT kernel and RCU boosting is enabled by default. You could disable it if needed. Config wise you set CONFIG_PREEMPT_LAZY=n but in general CONFIG_PREEMPT_LAZY=y should be used if possible. The preemption while holding a sleeping spinlock is somehow bad for performance if a lot of threads ask for it. But then it probably doesn't matter for testing. You do set rcupdate.rcu_normal and rcupdate.rcu_expedited but RT has rcu_normal_after_boot set by default. Not sure if this makes any difference but I *think* that normal wins here. > Signed-off-by: Paul E. McKenney <paul...@kernel.org> > Cc: Sebastian Andrzej Siewior <bige...@linutronix.de> Sebastian
