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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
..
preload
libbpf: Add LIBBPF_DEPRECATED_SINCE macro for scheduling API deprecations
2021-09-09 23:28:05 +02:00
arraymap.c
bpf: Add map side support for bpf timers.
2021-07-15 22:31:10 +02:00
bpf_inode_storage.c
bpf: Fix spelling mistakes
2021-05-24 21:13:05 -07:00
bpf_iter.c
bpf: Refactor BPF_PROG_RUN into a function
2021-08-17 00:45:07 +02:00
bpf_local_storage.c
bpf: Prevent deadlock from recursive bpf_task_storage_[get|delete]
2021-02-26 11:51:48 -08:00
bpf_lru_list.c
bpf_lru_list: Read double-checked variable once without lock
2021-02-10 15:54:26 -08:00
bpf_lru_list.h
bpf: Fix a typo "inacitve" -> "inactive"
2020-04-06 21:54:10 +02:00
bpf_lsm.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
2021-06-17 11:54:56 -07:00
bpf_struct_ops_types.h
bpf: tcp: Support tcp_congestion_ops in bpf
2020-01-09 08:46:18 -08:00
bpf_struct_ops.c
bpf: tcp: Allow bpf-tcp-cc to call bpf_(get|set)sockopt
2021-08-25 17:40:35 -07:00
bpf_task_storage.c
bpf: Consolidate task_struct BTF_ID declarations
2021-08-25 10:37:05 -07:00
btf.c
bpf: Fix bpf-next builds without CONFIG_BPF_EVENTS
2021-08-25 19:41:39 -07:00
cgroup.c
bpf: Migrate cgroup_bpf to internal cgroup_bpf_attach_type enum
2021-08-23 17:50:24 -07:00
core.c
bpf: Undo off-by-one in interpreter tail call count limit
2021-08-19 18:33:37 +02:00
cpumap.c
bpf: cpumap: Implement generic cpumap
2021-07-07 20:01:45 -07:00
devmap.c
bpf, devmap: Exclude XDP broadcast to master device
2021-08-09 23:25:14 +02:00
disasm.c
bpf: Introduce BPF nospec instruction for mitigating Spectre v4
2021-07-29 00:20:56 +02:00
disasm.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295
2019-06-05 17:36:38 +02:00
dispatcher.c
bpf: Remove bpf_image tree
2020-03-13 12:49:52 -07:00
hashtab.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-08-13 06:41:22 -07:00
helpers.c
Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
2021-08-30 16:42:47 -07:00
inode.c
bpf: Fix regression on BPF_OBJ_GET with non-O_RDWR flags
2021-06-22 14:57:43 +02:00
Kconfig
sock_map: Relax config dependency to CONFIG_NET
2021-07-15 18:17:49 -07:00
local_storage.c
bpf: Increase supported cgroup storage value size
2021-07-27 15:59:29 -07:00
lpm_trie.c
bpf: Allow RCU-protected lookups to happen from bh context
2021-06-24 19:41:15 +02:00
Makefile
bpf: Enable task local storage for tracing programs
2021-02-26 11:51:47 -08:00
map_in_map.c
bpf: Remember BTF of inner maps.
2021-07-15 22:31:10 +02:00
map_in_map.h
bpf: Add map_meta_equal map ops
2020-08-28 15:41:30 +02:00
map_iter.c
bpf: Implement link_query callbacks in map element iterators
2020-08-21 14:01:39 -07:00
net_namespace.c
bpf: Add support for forced LINK_DETACH command
2020-08-01 20:38:28 -07:00
offload.c
bpf, offload: Replace bitwise AND by logical AND in bpf_prog_offload_info_fill
2020-02-17 16:53:49 +01:00
percpu_freelist.c
bpf: Use raw_spin_trylock() for pcpu_freelist_push/pop in NMI
2020-10-06 00:04:11 +02:00
percpu_freelist.h
bpf: Use raw_spin_trylock() for pcpu_freelist_push/pop in NMI
2020-10-06 00:04:11 +02:00
prog_iter.c
bpf: Refactor bpf_iter_reg to have separate seq_info member
2020-07-25 20:16:32 -07:00
queue_stack_maps.c
bpf: Eliminate rlimit-based memory accounting for queue_stack_maps maps
2020-12-02 18:32:46 -08:00
reuseport_array.c
bpf: Fix spelling mistakes
2021-05-24 21:13:05 -07:00
ringbuf.c
bpf: Fix false positive kmemleak report in bpf_ringbuf_area_alloc()
2021-06-28 15:57:46 +02:00
stackmap.c
bpf: Consolidate task_struct BTF_ID declarations
2021-08-25 10:37:05 -07:00
syscall.c
bpf: Use kvmalloc for map keys in syscalls
2021-08-20 00:09:49 +02:00
sysfs_btf.c
bpf: Load and verify kernel module BTFs
2020-11-10 15:25:53 -08:00
task_iter.c
bpf: Consolidate task_struct BTF_ID declarations
2021-08-25 10:37:05 -07:00
tnum.c
bpf, tnums: Provably sound, faster, and more precise algorithm for tnum_mul
2021-06-01 13:34:15 +02:00
trampoline.c
bpf: Introduce helper bpf_get_branch_snapshot
2021-09-13 10:53:50 -07:00
verifier.c
Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
2021-08-30 16:42:47 -07:00