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/kernel/
DKconfig.preempt14 Select this option if you are building a kernel for a server or
16 raw processing power of the kernel, irrespective of scheduling
22 This option reduces the latency of the kernel by adding more
23 "explicit preemption points" to the kernel code. These new
30 is in kernel mode executing a system call. This allows
34 Select this if you are building a kernel for a desktop system.
41 This option reduces the latency of the kernel by making
42 all kernel code (that is not executing in a critical section)
45 even if it is in kernel mode executing a system call and would
49 and a slight runtime overhead to kernel code.
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/kernel/gcov/
DKconfig1 menu "GCOV-based kernel profiling"
4 bool "Enable gcov-based kernel profiling"
15 for the entire kernel. To enable profiling for specific files or
45 This options activates profiling for the entire kernel.
49 Note that a kernel compiled with profiling flags will be significantly
51 which are not linked to the kernel image to prevent linker errors.
60 In such a case use this option to adjust the format used in the kernel
/kernel/trace/
DKconfig129 Enable the kernel tracing infrastructure.
140 Enable the kernel to trace every kernel function. This is done
142 instruction at the beginning of every kernel function, which NOP
155 Enable the kernel to trace a function at both its return
193 echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
195 (Note that kernel size and overhead increase with this option
217 echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
219 (Note that kernel size and overhead increase with this option
237 This tracer, when enabled will create one or more kernel threads,
240 something other than the kernel. For example, if a
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/kernel/events/
Dcallchain.c185 bool kernel = !event->attr.exclude_callchain_kernel; in perf_callchain() local
191 if (!kernel && !user) in perf_callchain()
194 return get_perf_callchain(regs, 0, kernel, user, max_stack, crosstask, true); in perf_callchain()
198 get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user, in get_perf_callchain() argument
218 if (kernel && !user_mode(regs)) { in get_perf_callchain()
Dcore.c8150 unsigned int kernel = 0; in perf_event_parse_addr_filter() local
8185 kernel = 1; in perf_event_parse_addr_filter()
8230 if (kernel && event->attr.exclude_kernel) in perf_event_parse_addr_filter()
8233 if (!kernel) { in perf_event_parse_addr_filter()
/kernel/livepatch/
DKconfig4 Arch supports kernel live patching
14 Say Y here if you want to support kernel live patching.
15 This option has no runtime impact until a kernel "patch"
/kernel/power/
DKconfig23 bool "Skip kernel's sys_sync() on suspend to RAM/standby"
27 Skip the kernel sys_sync() before freezing user processes.
48 after placing resume=/dev/swappartition on the kernel command line
61 boot, pass the 'resume=/dev/swappartition' argument to the kernel to
64 be reloaded, then use the 'noresume' kernel command line argument.
122 Allow the kernel to trigger a system transition into a global sleep
170 fields of device objects from user space. If you are not a kernel
179 Enable this with a kernel parameter like "test_suspend=mem".
259 random kernel OOPSes or reboots that don't seem to be related to
295 Enabling workqueue.power_efficient kernel parameter makes the
/kernel/configs/
Dandroid-fetch-configs.sh3 curl https://android.googlesource.com/kernel/configs/+archive/master/android-4.9.tar.gz | tar xzv
/kernel/time/
DKconfig106 the task mostly runs in userspace and has few kernel activity.
111 This is implemented at the expense of some overhead in user <-> kernel
194 the size of the kernel image.
Dtimeconst.bc42 print "/* Automatically generated by kernel/time/timeconst.bc */\n"
/kernel/bpf/
Dstackmap.c131 bool kernel = !user; in BPF_CALL_3() local
138 trace = get_perf_callchain(regs, init_nr, kernel, user, in BPF_CALL_3()
/kernel/irq/
DKconfig104 low kernel memory footprint on smaller machines.