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/kernel/trace/
DKconfig3 # Architectures that offer an FUNCTION_TRACER implementation should
104 Create preempt/irq toggle tracepoints if needed, so that other parts
107 # All tracer options should select GENERIC_TRACER. For those options that are
197 compile time, a table is made of all the locations that ftrace
235 the trace_stat directory; this file shows the list of functions that
250 This tracer works by hooking into every function call that the
290 (Note that kernel size and overhead increase with this option
314 (Note that kernel size and overhead increase with this option
348 A kernel thread is created that will spin with interrupts disabled
411 the current time and the absolute time that the timer was set
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/kernel/rcu/
DKconfig12 This option selects the RCU implementation that is
22 This option selects the RCU implementation that is
34 This option selects the RCU implementation that is
83 This option enables a task-based RCU implementation that uses
91 This option enables a task-based RCU implementation that uses
101 This option enables a task-based RCU implementation that uses
110 This option enables RCU CPU stall code that is common between
149 against lock contention. Systems that synchronize their
158 skew them, which reduces lock contention enough that large
167 please understand that you may also need to set the skew_tick
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DKconfig.debug17 turned off since there are several list RCU users that still
36 This option provides a kernel module that runs performance
55 This option provides a kernel module that runs torture tests
74 This option provides a kernel module that runs performance tests
123 Select this option to build an RCU variant that is strict about
/kernel/bpf/
DKconfig3 # BPF interpreter that, for example, classic socket filters depend on.
7 # Used by archs to tell that they support BPF JIT compiler plus which
19 # Used by archs to tell that they want the BPF JIT compiler enabled by
20 # default for kernels that were compiled with BPF JIT support.
35 Enable the bpf() system call that allows to manipulate BPF programs
/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.preempt46 all kernel code (that is not executing in a critical section)
109 prctl(PR_SCHED_CORE) -- task selection ensures that all SMT siblings
/kernel/dma/
DKconfig16 # IOMMU drivers that can bypass the IOMMU code and optionally use the direct
98 # The only thing that is really required is a way to set an uncached bit
129 hardware components that do not support I/O map nor scatter-gather.
143 Enable this option to get pernuma CMA areas so that devices like
205 of 8 means that the buffers will be aligned up to 1MiB only.
217 drivers like double-freeing of DMA mappings or freeing mappings that
230 Perform extra checking that callers of dma_map_sg() have respected the
246 Provides /sys/kernel/debug/dma_map_benchmark that helps with testing
/kernel/power/
DKconfig48 system and powers it off; and restores that checkpoint on reboot.
59 of the reasons to use software suspend is that the firmware hooks
68 Note, however, that fsck will be run on your filesystems and you will
77 that were mounted before the suspend. In particular, you MUST NOT
100 The default resume partition is the partition that the suspend-
104 It should be a valid swap partition (at least for now) that is turned
202 linked, ensuring that it's available when this test runs.
212 Sets up a watchdog timer to capture drivers that are
246 RTC across reboots, so that you can debug a machine that just hangs
274 manpage ("man 8 hdparm") for that), and it doesn't turn off
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/kernel/bpf/preload/
DKconfig15 This builds kernel module with several embedded BPF programs that are
16 pinned into BPF FS mount point as human readable files that are
/kernel/time/
DKconfig63 The legacy timer tick helper is used by platforms that
157 for context tracking and the subsystems that rely on it: RCU
166 Say N otherwise, this option brings an overhead that you
172 This is the old config entry that enables dynticks idle.
/kernel/gcov/
DKconfig35 Note that the debugfs filesystem has to be mounted to access
52 Note that a kernel compiled with profiling flags will be significantly
/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/
DKconfig124 Sparse irq numbering is useful for distro kernels that want
/kernel/locking/
Dlockdep.c2736 struct lock_list this, that; in check_irq_usage() local
2761 bfs_init_root(&that, next); in check_irq_usage()
2763 ret = find_usage_forwards(&that, forward_mask, &target_entry1); in check_irq_usage()
2806 print_bad_irq_dependency(curr, &this, &that, in check_irq_usage()
/kernel/sched/
Dcore.c6115 static bool try_steal_cookie(int this, int that) in try_steal_cookie() argument
6117 struct rq *dst = cpu_rq(this), *src = cpu_rq(that); in try_steal_cookie()