What is devmem2?
What is devmem2?
devmem2 is a simple program to read/write from/to any location in memory. Useful when debugging embedded boards, e.g. beagleboard.
How do you remember all the Linux commands?
The first thing you can use to remember commands that you’ve already used is your own command line history. Most Linux shells, including the most common default, Bash, create a history file that lists your past commands. For Bash, you can find it at “/home//. bash_history.”
What is Devmem Linux?
/dev/mem is a character device file that is an image of the main memory of the computer. It may be used, for example, to examine (and even patch) the system. Byte addresses in /dev/mem are interpreted as physical memory addresses. References to nonexistent locations cause errors to be returned.
Can kernel access physical memory?
Even the kernel has no direct access to physical memory in the way your are thinking. Basically the kind of memory you seem to imagine (linear memory with flat addressing) is something that is constructed by the kernel (from physical memory banks) and exported, it doesn’t “exist”.
How many Linux commands are there?
There are well over 100 Unix commands shared by the Linux kernel and other Unix-like operating systems.
How do I see zombie processes?
How to spot a Zombie Process. Zombie processes can be found easily with the ps command. Within the ps output there is a STAT column which will show the processes current status, a zombie process will have Z as the status. In addition to the STAT column zombies commonly have the words in the CMD column as well …
What is S in top command?
From the top man page: ‘D’ = uninterruptible sleep ‘R’ = running ‘S’ = sleeping ‘T’ = traced or stopped ‘Z’ = zombie. ‘R’ is the easiest; the process is ready to run, and will run whenever its turn to use the CPU comes.
What is Highmem?
High memory (highmem) is used when the size of physical memory approaches or exceeds the maximum size of virtual memory. At that point it becomes impossible for the kernel to keep all of the available physical memory mapped at all times.