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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-01-07 02:33:47 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-01-14 04:56:49 -0800
commitc072a388d59a1d48e36864d0e66f42d71745be1c (patch)
treea0537c767c834d1846430ab3bb4eb83c0d0923d7 /init
parent394f4528c523d88daabd50f883a8d6b164075555 (diff)
downloadlinux-2.6.38-lt-ux500-c072a388d59a1d48e36864d0e66f42d71745be1c.tar.gz
rcu: demote SRCU_SYNCHRONIZE_DELAY from kernel-parameter status
Because the adaptive synchronize_srcu_expedited() approach has worked very well in testing, remove the kernel parameter and replace it by a C-preprocessor macro. If someone finds problems with this approach, a more complex and aggressively adaptive approach might be required. Longer term, SRCU will be merged with the other RCU implementations, at which point synchronize_srcu_expedited() will be event driven, just as synchronize_sched_expedited() currently is. At that point, there will be no need for this adaptive approach. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig15
1 files changed, 0 insertions, 15 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 526ec1c7456..e11bc793a91 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -497,21 +497,6 @@ config RCU_BOOST_DELAY
Accept the default if unsure.
-config SRCU_SYNCHRONIZE_DELAY
- int "Microseconds to delay before waiting for readers"
- range 0 20
- default 10
- help
- This option controls how long SRCU delays before entering its
- loop waiting on SRCU readers. The purpose of this loop is
- to avoid the unconditional context-switch penalty that would
- otherwise be incurred if there was an active SRCU reader,
- in a manner similar to adaptive locking schemes. This should
- be set to be a bit longer than the common-case SRCU read-side
- critical-section overhead.
-
- Accept the default if unsure.
-
endmenu # "RCU Subsystem"
config IKCONFIG