kaiwan

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Kaiwan N Billimoria, kaiwanTECH : opensource GitHub repos for source code
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<<------- My book repos ------->>
Linux Kernel Programming, 2E (2nd Edition)
 - A comprehensive guide to kernel internals, writing kernel modules, and kernel synchronization
Packt, Feb 2024
https://github.com/PacktPublishing/Linux-Kernel-Programming_2E

g-berthiaume

Useful GCC Compiler Options

A non exhaustive list of gcc compiler options.

$ gcc myprog.c -o myprog -Wall -Wextra -pedantic -std=c11 [...]

Optimization:

jrelo

Source material:
  http://security.stackexchange.com/questions/24444/what-is-the-most-hardened-set-of-options-for-gcc-compiling-c-c
  https://wiki.gentoo.org/wiki/Hardened_Gentoo
  https://wiki.debian.org/Hardening

================================================================================================================>
GCC Security related flags and options:

CFLAGS="-fPIE -fstack-protector-all -D_FORTIFY_SOURCE=2" 
LDFLAGS="-Wl,-z,now -Wl,-z,relro"

mikea

L1 cache reference                  0.5 ns
Branch mispredict                   5 ns
L2 cache reference                  7 ns                      14x L1 cache
Mutex lock/unlock                   25 ns                     
Main memory reference               100 ns                    4x mutex op, 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy        3,000 ns
Send 2K bytes over 1 Gbps network   20,000 ns
Read 1 MB sequentially from memory  250,000 ns