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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2008-10-02 16:06:39 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-03 10:36:08 +0200 |
| commit | 2133b5d7ff531bc15a923db4a6a50bf96c561be9 (patch) | |
| tree | 5917515eaec573fbc3d4a734769d6184beb83dbb /lib | |
| parent | b5259d944279d0b7e78a83849a352d8ba0447c4c (diff) | |
| download | lwn-2133b5d7ff531bc15a923db4a6a50bf96c561be9.tar.gz lwn-2133b5d7ff531bc15a923db4a6a50bf96c561be9.zip | |
rcu: RCU-based detection of stalled CPUs for Classic RCU
This patch adds stalled-CPU detection to Classic RCU. This capability
is enabled by a new config variable CONFIG_RCU_CPU_STALL_DETECTOR, which
defaults disabled.
This is a debugging feature to detect infinite loops in kernel code, not
something that non-kernel-hackers would be expected to care about.
This feature can detect looping CPUs in !PREEMPT builds and looping CPUs
with preemption disabled in PREEMPT builds. This is essentially a port of
this functionality from the treercu patch, replacing the stall debug patch
that is already in tip/core/rcu (commit 67182ae1c4).
The changes from the patch in tip/core/rcu include making the config
variable name match that in treercu, changing from seconds to jiffies to
avoid spurious warnings, and printing a boot message when this feature
is enabled.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index ccede1aeab38..9fee969dd60e 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -597,7 +597,7 @@ 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_CPU_STALL +config RCU_CPU_STALL_DETECTOR bool "Check for stalled CPUs delaying RCU grace periods" depends on CLASSIC_RCU default n |