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rcu: update: Make RCU_EXPEDITE_BOOT be the default

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RCU_EXPEDITE_BOOT should speed up the boot process by enforcing
synchronize_rcu_expedited() instead of synchronize_rcu() during the boot
process. There should be no reason why one does not want this and there
is no need worry about real time latency at this point.
Therefore make it default.

Note that users wishing to avoid expediting entirely, for example when
bringing up new hardware possibly having flaky IPIs, can use the
rcu_normal boot parameter to override boot-time expediting.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[ paulmck: Reworded commit log. ]
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Sebastian Andrzej Siewior 2016-11-02 17:30:02 +01:00 committed by Paul E. McKenney
parent 52d7e48b86
commit 7c6094db59
2 changed files with 2 additions and 17 deletions
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13
init/Kconfig
View File

@ -781,19 +781,6 @@ config RCU_NOCB_CPU_ALL
endchoice endchoice
config RCU_EXPEDITE_BOOT
bool
default n
help
This option enables expedited grace periods at boot time,
as if rcu_expedite_gp() had been invoked early in boot.
The corresponding rcu_unexpedite_gp() is invoked from
rcu_end_inkernel_boot(), which is intended to be invoked
at the end of the kernel-only boot sequence, just before
init is exec'ed.
Accept the default if unsure.
endmenu # "RCU Subsystem" endmenu # "RCU Subsystem"
config BUILD_BIN2C config BUILD_BIN2C

6
kernel/rcu/update.c
View File

@ -132,8 +132,7 @@ bool rcu_gp_is_normal(void)
} }
EXPORT_SYMBOL_GPL(rcu_gp_is_normal); EXPORT_SYMBOL_GPL(rcu_gp_is_normal);
static atomic_t rcu_expedited_nesting = static atomic_t rcu_expedited_nesting = ATOMIC_INIT(1);
ATOMIC_INIT(IS_ENABLED(CONFIG_RCU_EXPEDITE_BOOT) ? 1 : 0);
/* /*
* Should normal grace-period primitives be expedited? Intended for * Should normal grace-period primitives be expedited? Intended for
@ -182,8 +181,7 @@ EXPORT_SYMBOL_GPL(rcu_unexpedite_gp);
*/ */
void rcu_end_inkernel_boot(void) void rcu_end_inkernel_boot(void)
{ {
if (IS_ENABLED(CONFIG_RCU_EXPEDITE_BOOT)) rcu_unexpedite_gp();
rcu_unexpedite_gp();
if (rcu_normal_after_boot) if (rcu_normal_after_boot)
WRITE_ONCE(rcu_normal, 1); WRITE_ONCE(rcu_normal, 1);
} }