diff options
| author | Joel Fernandes (Google) <joel@joelfernandes.org> | 2023-01-12 00:52:22 +0000 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2023-01-17 20:20:11 -0800 |
| commit | 6efdda8bec2900ce5166ee4ff4b1844b47b529cd (patch) | |
| tree | e20406bef96bf31a1bdfb03467cb074ef9ab0265 /kernel/rcu/tree.c | |
| parent | ccfe1fef9409ca80ffad6ce822a6d15eaee67c91 (diff) | |
rcu: Track laziness during boot and suspend
Boot and suspend/resume should not be slowed down in kernels built with
CONFIG_RCU_LAZY=y. In particular, suspend can sometimes fail in such
kernels.
This commit therefore adds rcu_async_hurry(), rcu_async_relax(), and
rcu_async_should_hurry() functions that track whether or not either
a boot or a suspend/resume operation is in progress. This will
enable a later commit to refrain from laziness during those times.
Export rcu_async_should_hurry(), rcu_async_hurry(), and rcu_async_relax()
for later use by rcutorture.
[ paulmck: Apply feedback from Steve Rostedt. ]
Fixes: 3cb278e73be5 ("rcu: Make call_rcu() lazy to save power")
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 89313c7c17b6..712c4e7b4675 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -4414,11 +4414,13 @@ static int rcu_pm_notify(struct notifier_block *self, switch (action) { case PM_HIBERNATION_PREPARE: case PM_SUSPEND_PREPARE: + rcu_async_hurry(); rcu_expedite_gp(); break; case PM_POST_HIBERNATION: case PM_POST_SUSPEND: rcu_unexpedite_gp(); + rcu_async_relax(); break; default: break; |