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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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DMakefile173 kernel/system_certificates.o: $(obj)/x509_certificate_list
198 $(error Could not determine digest type to use from kernel config)
Dtimeconst.bc42 print "/* Automatically generated by kernel/timeconst.bc */\n"
/kernel/trace/
DKconfig139 Enable the kernel tracing infrastructure.
150 Enable the kernel to trace every kernel function. This is done
152 instruction at the beginning of every kernel function, which NOP
165 Enable the kernel to trace a function at both its return
192 echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
194 (Note that kernel size and overhead increase with this option
216 echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
218 (Note that kernel size and overhead increase with this option
237 This tracer hooks to various trace points in the kernel,
256 echo 1 > /sys/kernel/debug/tracing/snapshot
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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
41 This options activates profiling for the entire kernel.
45 Note that a kernel compiled with profiling flags will be significantly
47 which are not linked to the kernel image to prevent linker errors.
/kernel/events/
Dcallchain.c162 int kernel = !event->attr.exclude_callchain_kernel; in perf_callchain() local
165 if (!kernel && !user) in perf_callchain()
177 if (kernel && !user_mode(regs)) { in perf_callchain()
/kernel/power/
DKconfig45 after placing resume=/dev/swappartition on the kernel command line
58 boot, pass the 'resume=/dev/swappartition' argument to the kernel to
61 be reloaded, then use the 'noresume' kernel command line argument.
119 Allow the kernel to trigger a system transition into a global sleep
172 fields of device objects from user space. If you are not a kernel
181 Enable this with a kernel parameter like "test_suspend=mem".
245 random kernel OOPSes or reboots that don't seem to be related to
289 Prints the time spent in suspend in the kernel log, and
291 /sys/kernel/debug/suspend_time
/kernel/time/
DKconfig114 the task mostly runs in userspace and has few kernel activity.
119 This is implemented at the expense of some overhead in user <-> kernel
152 the size of the kernel image.
/kernel/irq/
DKconfig79 low kernel memory footprint on smaller machines.