refscale: Add SRCU-fast-updown readers

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This commit adds refscale readers based on srcu_read_lock_fast_updown()
and srcu_read_unlock_fast_updown()
("refscale.scale_type=srcu-fast-updown"). On my x86 laptop, these are
about 2.2ns per pair.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: <bpf@vger.kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>

...

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Paul E. McKenney 2025-11-02 14:49:48 -08:00 • committed by Frederic Weisbecker

parent 81f00c462e

commit bfad33230a

1 changed files with 39 additions and 1 deletions

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kernel/rcu/refscale.c

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