Hello:
This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@xxxxxxxxxxxxx>:
On Tue, 19 Mar 2024 14:20:13 -0700 you wrote:
> get_kernel_nofault() (or, rather, underlying copy_from_kernel_nofault())
> is not free and it does pop up in performance profiles when
> kprobes are heavily utilized with CONFIG_X86_KERNEL_IBT=y config.
>
> Let's avoid using it if we know that fentry_ip - 4 can't cross page
> boundary. We do that by masking lowest 12 bits and checking if they are
> >= 4, in which case we can do direct memory read.
>
> [...]
Here is the summary with links:
- [bpf-next] bpf: avoid get_kernel_nofault() to fetch kprobe entry IP
https://git.kernel.org/bpf/bpf-next/c/a8497506cd2c
You are awesome, thank you!
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