What you'll learn:
- Programming timing in user space
- Timing Hardware
- Jiffies
- Low resolution & High resolution timers
- POSIX Clocks
Timing Measurements in Linux Kernel
Many computer activities are based on timing measurements.
E.g. Your Computer display is turned off, if you have not pressed a key or moved your mouse for a particular time.
Linux timing subsystem mainly handles two types of timing activities
1. Keeping the current time and date
a. time() , gettimeofday() and clock_gettime()
b. Time stamps for files and network packets
2. Maintaining Timers
a. Mechanisms to notify kernel and user space (ex. alarm()) that a certain interval of time has elapsed.
Hardware Devices
Linux depends on hardware devices to maintain time. These devices can be basically classified into two types:
1. Clocks/Counters: provide precise time measurements
Used to keep track of current time of day
2. Timers: Issue interrupts at fixed, predefined frequency.
Used for implementing software timers
What will you learn from this course?
Various timing commands: date, uptime
POSIX Clocks: CLOCK_BOOTTIME, CLOCK_MONOTONIC_RAW, CLOCK_REALTIME, CLOCK_PROCESS_CPUTIME_ID, CLOCK_THREAD_CPUTIME_ID
Timing System calls:ctime, gettimeofday, clock_gettime, clock_settime, clock_getres, times, getrusage
Setting time from userspace
How to measure time for a particular instruction
Hardware Devices used in timing measurement: RTC, TSC, Programmable Interval Timer, APIC, High Precision Event Timer
Jiffies
Low Resolution and High Resolution Timers
This course comes with a 30 day money back guaranteed!. If you are not satisfied with the course, you'll get your money back
So what are you waiting for, enroll now and take the next step in learning Timing subsystem in Linux Kernel
