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authorIngo Molnar <mingo@kernel.org>2015-03-27 10:04:06 +0100
committerIngo Molnar <mingo@kernel.org>2015-03-27 10:04:06 +0100
commit4bfe186dbe0a058680e4bfb0d673194f0ceaffd4 (patch)
tree5e374857dcd979d50f51c7091505784cb053d078 /lib
parent3c435c1e472ba344ee25f795f4807d4457e61f6c (diff)
parent42528795ac1c8d7ba021797ec004904168956d64 (diff)
Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
Pull RCU updates from Paul E. McKenney: - Documentation updates. - Changes permitting use of call_rcu() and friends very early in boot, for example, before rcu_init() is invoked. - Miscellaneous fixes. - Add in-kernel API to enable and disable expediting of normal RCU grace periods. - Improve RCU's handling of (hotplug-) outgoing CPUs. Note: ARM support is lagging a bit here, and these improved diagnostics might generate (harmless) splats. - NO_HZ_FULL_SYSIDLE fixes. - Tiny RCU updates to make it more tiny. Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug35
1 files changed, 25 insertions, 10 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c5cefb3c009c..1ad74c0df01f 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1180,16 +1180,7 @@ config DEBUG_CREDENTIALS
menu "RCU Debugging"
config PROVE_RCU
- bool "RCU debugging: prove RCU correctness"
- depends on PROVE_LOCKING
- default n
- help
- This feature enables lockdep extensions that check for correct
- use of RCU APIs. This is currently under development. Say Y
- if you want to debug RCU usage or help work on the PROVE_RCU
- feature.
-
- Say N if you are unsure.
+ def_bool PROVE_LOCKING
config PROVE_RCU_REPEATEDLY
bool "RCU debugging: don't disable PROVE_RCU on first splat"
@@ -1257,6 +1248,30 @@ config RCU_TORTURE_TEST_RUNNABLE
Say N here if you want the RCU torture tests to start only
after being manually enabled via /proc.
+config RCU_TORTURE_TEST_SLOW_INIT
+ bool "Slow down RCU grace-period initialization to expose races"
+ depends on RCU_TORTURE_TEST
+ help
+ This option makes grace-period initialization block for a
+ few jiffies between initializing each pair of consecutive
+ rcu_node structures. This helps to expose races involving
+ grace-period initialization, in other words, it makes your
+ kernel less stable. It can also greatly increase grace-period
+ latency, especially on systems with large numbers of CPUs.
+ This is useful when torture-testing RCU, but in almost no
+ other circumstance.
+
+ Say Y here if you want your system to crash and hang more often.
+ Say N if you want a sane system.
+
+config RCU_TORTURE_TEST_SLOW_INIT_DELAY
+ int "How much to slow down RCU grace-period initialization"
+ range 0 5
+ default 3
+ help
+ This option specifies the number of jiffies to wait between
+ each rcu_node structure initialization.
+
config RCU_CPU_STALL_TIMEOUT
int "RCU CPU stall timeout in seconds"
depends on RCU_STALL_COMMON