diff options
| author |   Yonghong Song <yhs@fb.com> | 2018-04-28 22:28:08 -0700 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2018-04-29 08:45:53 -0700 |
| commit | c195651e565ae7f41a68acb7d4aa7390ad215de1 (patch) | |
| tree | b11a7c5682239958cc2089fbbb95f626df7b5b7c /include/linux/bpf.h | |
| parent | bpf: change prototype for stack_map_get_build_id_offset (diff) | |
| download | linux-dev-c195651e565ae7f41a68acb7d4aa7390ad215de1.tar.xz linux-dev-c195651e565ae7f41a68acb7d4aa7390ad215de1.zip | |
bpf: add bpf_get_stack helper
Currently, stackmap and bpf_get_stackid helper are provided
for bpf program to get the stack trace. This approach has
a limitation though. If two stack traces have the same hash,
only one will get stored in the stackmap table,
so some stack traces are missing from user perspective.
This patch implements a new helper, bpf_get_stack, will
send stack traces directly to bpf program. The bpf program
is able to see all stack traces, and then can do in-kernel
processing or send stack traces to user space through
shared map or bpf_perf_event_output.
Acked-by: Alexei Starovoitov <ast@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux/bpf.h')
| -rw-r--r-- | include/linux/bpf.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 38ebbc61ed99..c553f6f9c6b0 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -692,6 +692,7 @@ extern const struct bpf_func_proto bpf_get_current_comm_proto; extern const struct bpf_func_proto bpf_skb_vlan_push_proto; extern const struct bpf_func_proto bpf_skb_vlan_pop_proto; extern const struct bpf_func_proto bpf_get_stackid_proto; +extern const struct bpf_func_proto bpf_get_stack_proto; extern const struct bpf_func_proto bpf_sock_map_update_proto; /* Shared helpers among cBPF and eBPF. */ |