Song Liu 856c02dbce bpf: Introduce helper bpf_get_branch_snapshot ...

Introduce bpf_get_branch_snapshot(), which allows tracing pogram to get
branch trace from hardware (e.g. Intel LBR). To use the feature, the
user need to create perf_event with proper branch_record filtering
on each cpu, and then calls bpf_get_branch_snapshot in the bpf function.
On Intel CPUs, VLBR event (raw event 0x1b00) can be use for this.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210910183352.3151445-3-songliubraving@fb.com

2021-09-13 10:53:50 -07:00

..

asm

tools arch: Update arch/x86/lib/mem{cpy,set}_64.S copies used in 'perf bench mem memcpy'

2021-05-10 09:01:00 -03:00

asm-generic

Merge branch 'akpm' (patches from Andrew)

2021-05-07 00:34:51 -07:00

linux

tools: Add sparse context/locking annotations in compiler-types.h

2021-08-19 15:39:22 -03:00

nolibc

tools/nolibc: Implement msleep()

2021-07-20 13:42:26 -07:00

tools

tools: bpf: fix license for a compat header file

2018-09-19 23:49:58 +02:00

trace/events

tools/lib/lockdep: Remove private kernel headers

2017-06-05 09:28:14 +02:00

uapi

bpf: Introduce helper bpf_get_branch_snapshot

2021-09-13 10:53:50 -07:00

vdso

tools headers: Synchronize linux/bits.h with the kernel sources

2020-04-14 11:40:05 -03:00