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Message-Id: <20121217182211.F300A6BF@kernel.stglabs.ibm.com> Date: Mon, 17 Dec 2012 13:22:11 -0500 From: Dave Hansen <dave@...ux.vnet.ibm.com> To: torvalds@...ux-foundation.org Cc: linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org, linux-arch@...r.kernel.org, Dave Hansen <dave@...ux.vnet.ibm.com> Subject: [PATCH 4/7] consolidate RCU debugging Kconfig options These were in two different places, and taking up too much of my valuable screen real-estate. Banish them to their own menu. Signed-off-by: Dave Hansen <dave@...ux.vnet.ibm.com> --- linux-2.6.git-dave/lib/Kconfig.debug | 160 +++++++++++++++++------------------ 1 file changed, 82 insertions(+), 78 deletions(-) diff -puN lib/Kconfig.debug~consolidat-rcu-debugging-configs lib/Kconfig.debug --- linux-2.6.git/lib/Kconfig.debug~consolidat-rcu-debugging-configs 2012-12-14 13:32:32.474878413 -0500 +++ linux-2.6.git-dave/lib/Kconfig.debug 2012-12-14 13:32:49.219018930 -0500 @@ -720,6 +720,8 @@ config PROVE_LOCKING For more details, see Documentation/lockdep-design.txt. +menu "RCU Debugging" + config PROVE_RCU bool "RCU debugging: prove RCU correctness" depends on PROVE_LOCKING @@ -775,6 +777,86 @@ config SPARSE_RCU_POINTER Say N if you are unsure. +config RCU_TORTURE_TEST + tristate "torture tests for RCU" + depends on DEBUG_KERNEL + default n + help + This option provides a kernel module that runs torture tests + on the RCU infrastructure. The kernel module may be built + after the fact on the running kernel to be tested, if desired. + + Say Y here if you want RCU torture tests to be built into + the kernel. + Say M if you want the RCU torture tests to build as a module. + Say N if you are unsure. + +config RCU_TORTURE_TEST_RUNNABLE + bool "torture tests for RCU runnable by default" + depends on RCU_TORTURE_TEST = y + default n + help + This option provides a way to build the RCU torture tests + directly into the kernel without them starting up at boot + time. You can use /proc/sys/kernel/rcutorture_runnable + to manually override this setting. This /proc file is + available only when the RCU torture tests have been built + into the kernel. + + Say Y here if you want the RCU torture tests to start during + boot (you probably don't). + Say N here if you want the RCU torture tests to start only + after being manually enabled via /proc. + +config RCU_CPU_STALL_TIMEOUT + int "RCU CPU stall timeout in seconds" + depends on TREE_RCU || TREE_PREEMPT_RCU + range 3 300 + default 60 + help + If a given RCU grace period extends more than the specified + number of seconds, a CPU stall warning is printed. If the + RCU grace period persists, additional CPU stall warnings are + printed at more widely spaced intervals. + +config RCU_CPU_STALL_VERBOSE + bool "Print additional per-task information for RCU_CPU_STALL_DETECTOR" + depends on TREE_PREEMPT_RCU + default y + help + This option causes RCU to printk detailed per-task information + for any tasks that are stalling the current RCU grace period. + + Say N if you are unsure. + + Say Y if you want to enable such checks. + +config RCU_CPU_STALL_INFO + bool "Print additional diagnostics on RCU CPU stall" + depends on (TREE_RCU || TREE_PREEMPT_RCU) && DEBUG_KERNEL + default n + help + For each stalled CPU that is aware of the current RCU grace + period, print out additional per-CPU diagnostic information + regarding scheduling-clock ticks, idle state, and, + for RCU_FAST_NO_HZ kernels, idle-entry state. + + Say N if you are unsure. + + Say Y if you want to enable such diagnostics. + +config RCU_TRACE + bool "Enable tracing for RCU" + depends on DEBUG_KERNEL + help + This option provides tracing in RCU which presents stats + in debugfs for debugging RCU implementation. + + Say Y here if you want to enable RCU tracing + Say N if you are unsure. + +endmenu # RCU Debugging + config LOCKDEP bool depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT @@ -990,84 +1072,6 @@ config BOOT_PRINTK_DELAY BOOT_PRINTK_DELAY also may cause LOCKUP_DETECTOR to detect what it believes to be lockup conditions. -config RCU_TORTURE_TEST - tristate "torture tests for RCU" - depends on DEBUG_KERNEL - default n - help - This option provides a kernel module that runs torture tests - on the RCU infrastructure. The kernel module may be built - after the fact on the running kernel to be tested, if desired. - - Say Y here if you want RCU torture tests to be built into - the kernel. - Say M if you want the RCU torture tests to build as a module. - Say N if you are unsure. - -config RCU_TORTURE_TEST_RUNNABLE - bool "torture tests for RCU runnable by default" - depends on RCU_TORTURE_TEST = y - default n - help - This option provides a way to build the RCU torture tests - directly into the kernel without them starting up at boot - time. You can use /proc/sys/kernel/rcutorture_runnable - to manually override this setting. This /proc file is - available only when the RCU torture tests have been built - into the kernel. - - Say Y here if you want the RCU torture tests to start during - boot (you probably don't). - Say N here if you want the RCU torture tests to start only - after being manually enabled via /proc. - -config RCU_CPU_STALL_TIMEOUT - int "RCU CPU stall timeout in seconds" - depends on TREE_RCU || TREE_PREEMPT_RCU - range 3 300 - default 21 - help - If a given RCU grace period extends more than the specified - number of seconds, a CPU stall warning is printed. If the - RCU grace period persists, additional CPU stall warnings are - printed at more widely spaced intervals. - -config RCU_CPU_STALL_VERBOSE - bool "Print additional per-task information for RCU_CPU_STALL_DETECTOR" - depends on TREE_PREEMPT_RCU - default y - help - This option causes RCU to printk detailed per-task information - for any tasks that are stalling the current RCU grace period. - - Say N if you are unsure. - - Say Y if you want to enable such checks. - -config RCU_CPU_STALL_INFO - bool "Print additional diagnostics on RCU CPU stall" - depends on (TREE_RCU || TREE_PREEMPT_RCU) && DEBUG_KERNEL - default n - help - For each stalled CPU that is aware of the current RCU grace - period, print out additional per-CPU diagnostic information - regarding scheduling-clock ticks, idle state, and, - for RCU_FAST_NO_HZ kernels, idle-entry state. - - Say N if you are unsure. - - Say Y if you want to enable such diagnostics. - -config RCU_TRACE - bool "Enable tracing for RCU" - depends on DEBUG_KERNEL - help - This option provides tracing in RCU which presents stats - in debugfs for debugging RCU implementation. - - Say Y here if you want to enable RCU tracing - Say N if you are unsure. - config KPROBES_SANITY_TEST bool "Kprobes sanity tests" depends on DEBUG_KERNEL _ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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