On 11/23/23 07:28, Andrea Righi wrote: > On Tue, Nov 21, 2023 at 08:53:04PM +0000, Qais Yousef wrote: > > To allow more flexible opt-in arrangements while still provide a single > > kernel for distros, provide a boot time parameter to enable lazy RCU. > > > > Specify: > > > > rcutree.enable_rcu_lazy > > > > Which also requires > > > > rcu_nocbs=all > > > > at boot time to enable lazy RCU assuming CONFIG_RCU_LAZY=y. The > > parameter will be ignored if CONFIG_RCU_LAZY is not set. > > > > With this change now lazy RCU is disabled by default if the boot > > parameter is not set even when CONFIG_RCU_LAZY is enabled. > > I'm wondering if we should make this enabled by default if > CONFIG_RCU_LAZY=y, so we don't break the previous behavior, and those > who want it disabled (despite having CONFIG_RCU_LAZY=y in their .config) > can add rcutree.enable_rcu_lazy=0 to the boot options. > > Thanks for working on this! Sure, thanks for having a look! Cheers -- Qais Yousef
