[PATCH bpf-next 0/3] bpf: introduce bpf_get_task_stack_trace()

This set introduces a new helper bpf_get_task_stack_trace(). The primary
use case is to dump all /proc/*/stack to seq_file via bpf_iter__task.

Song Liu (3):
  bpf: introduce helper bpf_get_task_stack_trace()
  bpf: allow %pB in bpf_seq_printf()
  selftests/bpf: add bpf_iter test with bpf_get_task_stack_trace()

 include/uapi/linux/bpf.h                      | 10 +++-
 kernel/trace/bpf_trace.c                      | 24 ++++++++-
 scripts/bpf_helpers_doc.py                    |  2 +
 tools/include/uapi/linux/bpf.h                | 10 +++-
 .../selftests/bpf/prog_tests/bpf_iter.c       | 17 +++++++
 .../selftests/bpf/progs/bpf_iter_task_stack.c | 50 +++++++++++++++++++
 6 files changed, 110 insertions(+), 3 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c

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2.24.1