All Questions
Tagged with optimization kernel
4
questions
-3
votes
1
answer
270
views
Why don't BSD kernels use likely() unlike Linux does?
As pointed out in an answer, there's some use of similar hints to compiler in say, FreeBSD and OpenBSD, but those hints coverage of Linux kernel code is a few magnitudes higher. It might make sense to ...
- 6,280
2
votes
1
answer
1k
views
Can I compile Linux kernel with -Ofast?
I want to know if compiling the Linux kernel with -Ofast is:
Worth it.
Supported (what level of optimization do the kernel writers take into account?)
Secure.
The question arised because ...
20
votes
1
answer
9k
views
Why can the kernel not use SSE/AVX registers and instructions?
This post from StackOverflow has this,
In some environments there there is a restriction on certain instructions or using certain registers. For example, in the Linux kernel, use of SSE/AVX or FP ...
- 31.8k
2
votes
0
answers
332
views
Is there a linux interface for arm cp15 register access?
For performance optizimization I should be able to switch bits in ACTLR register of the cp15 unit. I've done stuff like this before in bare metal projects, but from linux user space I can't execute ...
- 13.5k