Today I Learned
The translation lookaside buffer is a small cache that sits on the CPU alongside the memory management unit and caches page table entries.
This saves a trip to memory that the MMU has to make to get a page table entry from the page table.
TLB just returns the page table entry and the MMU can directly look up the physical memory address. If it isn't there, then the MMU has to make the trip to memory for the page table, put the PTE into the TLB, and then look up the physical address.
CTRL + u will delete + save everything from the cursor to the beginning of the line
CTRL + k will do the same thing but from cursor to the end of the line
Use CTRL + y to then paste + execute it
Usage:
Tyep command.
Remember you need to do something else. CTRL + u
Do something else.
CTRL + y
'CTRL + W' will delete the word just before the cursor instead of having to repeatedly backspace.
use option + b to jump back a word on the cmdline or option + f to jump a word
like how b and w work in vim
Instruction Set Architectures (ISAs) like x86-64 are what determine the actual byte sequences a compiler outputs for the specified ISA.
Those byte sequences then map literally to instructions on the CPU.
source code -> compiler targeting an ISA -> machine-code bytes -> CPU decodes bytes and executes instructions
They are like they key that defines the values a compiler can output to map to instructions for a CPU.
A Git tree records a directory's entries at one point in history. A commit points to a tree, which is why comparing commits can identify which files changed.