On Wed, Apr 18, 2018 at 09:54:37AM -0700, Yonghong Song wrote: > 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. > > Signed-off-by: Yonghong Song <y...@fb.com>
lgtm Acked-by: Alexei Starovoitov <a...@kernel.org>
