[Deepin-Kernel-SIG] [Upstream] [linux 6.6-y] rcu: Provide a boot time parameter to control lazy RCU #532
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mainline inclusion from mainline-v6.7-rc1 category: performance The return keyword is not needed here. Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> (cherry picked from commit 4502138)
mainline inclusion from mainline-v6.9-rc1 category: performance To allow more flexible arrangements while still provide a single kernel for distros, provide a boot time parameter to enable/disable lazy RCU. Specify: rcutree.enable_rcu_lazy=[y|1|n|0] Which also requires rcu_nocbs=all at boot time to enable/disable lazy RCU. To disable it by default at build time when CONFIG_RCU_LAZY=y, the new CONFIG_RCU_LAZY_DEFAULT_OFF can be used. Signed-off-by: Qais Yousef (Google) <qyousef@layalina.io> Tested-by: Andrea Righi <andrea.righi@canonical.com> Reviewed-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> (cherry picked from commit 7f66f09) Signed-off-by: Wentao Guan <guanwentao@uniontech.com>
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| @@ -2753,6 +2753,9 @@ __call_rcu_common(struct rcu_head *head, rcu_callback_t func, bool lazy_in) | |||
| } | |||
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| #ifdef CONFIG_RCU_LAZY | |||
| static bool enable_rcu_lazy __read_mostly = !IS_ENABLED(CONFIG_RCU_LAZY_DEFAULT_OFF); | |||
| module_param(enable_rcu_lazy, bool, 0444); | |||
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| /** | |||
| * call_rcu_hurry() - Queue RCU callback for invocation after grace period, and | |||
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Just provide a option to control lazy rcu, when enable lazy rcu in config.
Now we are not enable it, but maybe in future.
To allow more flexible arrangements while still provide a single kernel
for distros, provide a boot time parameter to enable/disable lazy RCU.
Specify:
Which also requires
at boot time to enable/disable lazy RCU.
To disable it by default at build time when CONFIG_RCU_LAZY=y, the new
CONFIG_RCU_LAZY_DEFAULT_OFF can be used.
Signed-off-by: Qais Yousef (Google) qyousef@layalina.io
Tested-by: Andrea Righi andrea.righi@canonical.com
Reviewed-by: Paul E. McKenney paulmck@kernel.org
Signed-off-by: Boqun Feng boqun.feng@gmail.com