rcu: Track laziness during boot and suspend

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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: 3cb278e73b ("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>

...

This commit is contained in:

Joel Fernandes (Google) 2023-01-12 00:52:22 +00:00 • committed by Paul E. McKenney

parent ccfe1fef94

commit 6efdda8bec

3 changed files with 47 additions and 1 deletions

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6

kernel/rcu/rcu.h

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2

kernel/rcu/tree.c

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40

kernel/rcu/update.c

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