Kernel Timing and Timers Source Code Pointers


These are some pointers to timing and timer related files in the Linux kernel.

The kernel/time/time.c file defines basic time related system calls: time, stime, gettimeofday, settimeofday, etc.

The kernel/time/timer.c file implements a legacy timer subsystem based on timer wheels.

The kernel/time/hrtimer.c file implements a high resolution timers subsystem that is the basis for high resolution kernel timers as well as most current userspace timer iterfaces: itimers, nanosleep, and POSIX timers.

The kernel/time/tick-common.c file defines functions for generating and handling tick events, including tick_periodic and tick_handle_periodic for periodic tick systems.

The kernel/time/tick-oneshot.c file defines functions for oneshot ticks.

The kernel/time/tick-broadcast.c file defines functions for handling the broadcast of tick events for SMP systems, including functions for handling ticks in oneshot mode.

The include/linux/ktime.h file defines the ktime_t type, which is a nanosecond representation of kernel time values.

The kernel/time/timekeeping.c file several functions for accessing, measuring, and setting time in the Linux kernel, including several functions which return or take as parameters variables of the ktime_t type.