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/kernel/rcu/
DKconfig12 This option selects the RCU implementation that is
21 This option selects the RCU implementation that is
33 This option selects the RCU implementation that is
76 This option enables a task-based RCU implementation that uses
83 This option enables RCU CPU stall code that is common between
120 against lock contention. Systems that synchronize their
129 skew them, which reduces lock contention enough that large
138 please understand that you may also need to set the skew_tick
167 This option boosts the priority of preempted RCU readers that
183 readers blocking that grace period. Note that any RCU reader
DKconfig.debug17 turned off since there are several list RCU users that still
34 This option provides a kernel module that runs performance
51 This option provides a kernel module that runs torture tests
/kernel/trace/
DKconfig3 # Architectures that offer an FUNCTION_TRACER implementation should
97 Create preempt/irq toggle tracepoints if needed, so that other parts
100 # All tracer options should select GENERIC_TRACER. For those options that are
208 (Note that kernel size and overhead increase with this option
233 (Note that kernel size and overhead increase with this option
266 A kernel thread is created that will spin with interrupts disabled
341 The likely/unlikely profiler only looks at the conditions that
391 Selected by tracers that will trace the likely and unlikely
403 "Trace likely/unlikely profiler" is that this is not a
420 This tracer works by hooking into every function call that the
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/kernel/power/
DKconfig30 user-space before invoking suspend. Say Y if that's your case.
45 system and powers it off; and restores that checkpoint on reboot.
56 of the reasons to use software suspend is that the firmware hooks
65 Note, however, that fsck will be run on your filesystems and you will
74 that were mounted before the suspend. In particular, you MUST NOT
88 The default resume partition is the partition that the suspend-
92 It should be a valid swap partition (at least for now) that is turned
192 linked, ensuring that it's available when this test runs.
202 Sets up a watchdog timer to capture drivers that are
236 RTC across reboots, so that you can debug a machine that just hangs
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/kernel/
DKconfig.hz12 beneficial for servers and NUMA systems that do not need to have
13 a fast response for user interaction and that may experience bus
15 Note that the timer interrupt occurs on each processor in an SMP
24 with lots of processors that may show reduced performance if
DKconfig.preempt45 all kernel code (that is not executing in a critical section)
/kernel/dma/
DKconfig86 hardware components that do not support I/O map nor scatter-gather.
151 of 8 means that the buffers will be aligned up to 1MiB only.
163 drivers like double-freeing of DMA mappings or freeing mappings that
167 accessed by the cpu in a way that could cause data corruption. For
168 example, this enables cow_user_page() to check that the source page is
181 Perform extra checking that callers of dma_map_sg() have respected the
/kernel/gcov/
DKconfig33 Note that the debugfs filesystem has to be mounted to access
50 Note that a kernel compiled with profiling flags will be significantly
/kernel/time/
DKconfig138 for context tracking and the subsystems that rely on it: RCU
147 Say N otherwise, this option brings an overhead that you
154 This is the old config entry that enables dynticks idle.
/kernel/configs/
Dnopm.config11 # ARM/ARM64 architectures that select PM unconditionally
/kernel/debug/kdb/
Dkdb_cmds3 # processes. Commands that require process data (including stack or
/kernel/irq/
DKconfig118 Sparse irq numbering is useful for distro kernels that want
/kernel/locking/
Dlockdep.c2230 struct lock_list this, that; in check_irq_usage() local
2256 that.parent = NULL; in check_irq_usage()
2257 that.class = hlock_class(next); in check_irq_usage()
2259 ret = find_usage_forwards(&that, forward_mask, &target_entry1); in check_irq_usage()
2292 print_bad_irq_dependency(curr, &this, &that, in check_irq_usage()