In computer operating system design, kernel preemption is a property possessed by some kernels (the cores of operating systems), in which the CPU can be interrupted in the middle of executing kernel code and assigned other tasks (from which it later returns to finish its kernel tasks). That is to say, the scheduler is permitted to forcibly perform a context switch (on behalf of a runnable and process) on a driver or other part of the kernel during its execution, rather than co-operatively waiting for the driver or kernel function (such as a system call) to complete its execution and return control of the processor to the scheduler when done. It is used mainly in monolithic and hybrid kernels, where all or most device drivers are run in kernel space. Linux is an example of a monolithic-kernel operating system with kernel preemption. The main benefit of kernel preemption is that it solves two issues that would otherwise be problematic for monolithic kernels, in which the kernel consists of one large binary (rather than multiple "services", as in a microkernel-based OS like Windows NT/Vista/7/10 or macOS). Without kernel preemption, two major issues exist for monolithic and hybrid kernels: * A device driver can enter an infinite loop or other unrecoverable state, crashing the whole system. * Some drivers and system calls on monolithic kernels can be slow to execute, and cannot return control of the processor to the scheduler or other program until they complete execution. (Wikipedia).
Introduction to Functions (Precalculus - College Algebra 2)
Support: https://professor-leonard.myshopify.com/ Cool Mathy Merch: https://professor-leonard.myshopify.com/ What Functions are and how we can determine when a relationship is a function and when it is not.
From playlist Precalculus - College Algebra/Trigonometry
Watch and Learn Algebra, Precalculus, Trigonometry
Algebra, Precalculus, and Trigonometry Problems If you enjoyed this video please consider subscribing https://www.youtube.com/user/themathsorcerer?sub_confirmation=1
From playlist Cool Math Stuff
What is a Function and How Do We Evaluate It? Precalculus
We introduce what a function is, what a function machine is, and how we evaluate functions. We evaluate functions with negative numbers, positive numbers, fractions, and even a variable! #Precalculus / #Precalc Join this channel to get access to perks: https://www.youtube.com/channel/UCGY
From playlist Precalculus
Intro to Precalculus (Precalculus - College Algebra 1)
Support: https://www.patreon.com/ProfessorLeonard Cool Mathy Merch: https://professor-leonard.myshopify.com/ How the Precalculus Series will be filmed and what it will entail.
From playlist Precalculus - College Algebra/Trigonometry
Kernel Recipes 2019 - RCU in 2019
RCU has seen lots of changes in the last 2 years. Of note is the RCU flavor consolidation and tree RCU’s lock contention improvements. There have been also improvements with static checking, fixes to scheduler deadlocks and improvements to RCU-based linked lists. This talk starts with an i
From playlist Kernel Recipes 2019
Embedded Recipes 2018 - Finding sources of latency in your system - Steven Rostedt
Having just an RTOS is not enough for a real-time system. The hardware must be deterministic as well as the applications that run on the system. When you are missing deadlines, the first thing that must be done is to find what is the source of the latency that caused the issue. It could be
From playlist Embedded Recipes 2018
Kernel Recipes 2019 - Formal modeling made easy
Modeling parts of Linux has become a recurring topic. For instance, the memory model, the model for PREEMPT_RT synchronization, and so on. But the term “formal model” causes panic for most of the developers. Mainly because of the complex notations and reasoning that involves formal languag
From playlist Kernel Recipes 2019
PreCalculus - Introduction/Preview of What is in this PreCalculus Series
Visit http://ilectureonline.com for more math and science lectures! In this video I will introduce and preview of the content of this Pre-Calculus series.
From playlist Michel van Biezen: PRECALCULUS 1-5 - ALGEBRA REVIEW
Kernel Recipes 2015 - CPU isolation: state of the art - by Frederic Weisbecker
HPC and real time workloads want to use 100% of the CPU and need to get rid of the tiniest noise from the kernel. How much can we do that now and what remains to be done. Frédéric Weisbecker, Red Hat
From playlist Kernel Recipes 2015
Kernel Recipes 2019 - ftrace: Where modifying a running kernel all started
Ftrace’s most powerful feature is the function tracer (and function graph tracer which is built from it). But to have this enabled on production systems, it had to have its overhead be negligible when disabled. As the function tracer uses gcc’s profiling mechanism, which adds a call to “mc
From playlist Kernel Recipes 2019
Kernel Recipes 2017 - What’s new in the world of storage for linux - Jens Axboe
Storage keeps moving forward, and so does the Linux IO stack. This talk will detail some of the recent additions and changes that have gone into the Linux kernel storage stack, helping Linux get the most out of industry innovations in that space. Jens Axboe, Facebook
From playlist Kernel Recipes 2017
Embedded Recipes 2019 - RT is about to make it to mainline. Now what?
The PREEMPT_RT (aka real-time patch) started back in 2004. Since then, a lot of it has made it into the kernel. The only part left is the change of turning spinning locks into mutexes, then the merge of the PREEMPT_RT patch will be complete. This is expected to happen no later than the Q1
From playlist Embedded Recipes 2019
In this video we are going to focus on getting ready for Pre-Calculus. To do that we are going to look what you need to do to prepare for pre-calculus, what works and what has not worked. ⭐️ Are you Ready For Pre-Calculus? https://youtu.be/BWrCU876vIc ✅ New Videos For Pre-Calculus - http
From playlist I am Taking Pre-Calculus
DEFCON 19: Owned Over Amateur Radio: Remote Kernel Exploitation in 2011
Speaker: Dan Rosenberg Originally considered to be the stuff of myth, remote kernel exploits allow attackers to bypass all operating system protection mechanisms and gain instant root access to remote systems. While reviewing prior work in remote kernel exploitation, this talk will go ove
From playlist DEFCON 19
Combining Functions & Function Operations
I go over combining functions through addition, subtraction, multiplication, and division. I also explain the restriction on domain of these combined functions Find free review test, useful notes and more at http://www.mathplane.com If you'd like to make a donation to support my efforts l
From playlist PreCalculus
Precalculus: Logarithm Rules Pt. 1
In this video, Kelsey reviews the Product and Quotient Rules for logarithms. Examples of the product and quotient rules are at the start of part 2!
From playlist Basics: Precalculus
Math 023 Precalculus Day 14: Combining Functions to Obtain New Functions
Arithmetic combinations; composition of functions; comment on the domain of a composition; iteration of functions; graphical representation of iteration.
From playlist Course 1: Precalculus
Kernel Recipes 2019 - No NMI? No Problem! – Implementing Arm64 Pseudo-NMI
As the name would suggest, a Non-Maskable Interrupt (NMI) is an interrupt-like feature that is unaffected by the disabling of classic interrupts. In Linux, NMIs are involved in some features such as performance event monitoring, hard-lockup detector, on demand state dumping, etc… Their pot
From playlist Kernel Recipes 2019
Kernel Recipes 2018 - Zinc: New Cryptography API for Linux Kernel - Jason Donenfeld
Zinc is a new minimal cryptography API for the kernel that is in the process of being upstreamed. Rather than providing an abstracted framework, Zinc provides simple functions. This talk will address the design considerations of the new API, its approach to implementation choice and fuzzi
From playlist Kernel Recipes 2018
This video will teach students how to convert from fractions to decimals. In particular, I show students how to set up a long division problem using a fraction. Next, I demonstrate the technique of adding zeroes so that an accurate decimal can be found. Thank you for watching and please s
From playlist PreAlgebra