This patch series makes the following changes: * Adds a new bpf helper `bpf_access_process_vm` to read user space memory from a different task. * Adds the ability to create sleepable bpf iterator programs. As an example of how this will be used, at Meta we are using bpf task iterator programs and this new bpf helper to read C++ async stack traces of a running process for debugging C++ binaries in production. Changes since v1: * Fixed "Invalid wait context" issue in `bpf_iter_run_prog` by using `rcu_read_lock_trace()` for sleepable bpf iterator programs. Kenny Yu (4): bpf: Add bpf_access_process_vm() helper bpf: Add support for sleepable programs in bpf_iter_run_prog libbpf: Add "iter.s" section for sleepable bpf iterator programs selftests/bpf: Add test for sleepable bpf iterator programs include/linux/bpf.h | 1 + include/uapi/linux/bpf.h | 10 ++++ kernel/bpf/bpf_iter.c | 16 ++++-- kernel/bpf/helpers.c | 19 +++++++ kernel/trace/bpf_trace.c | 2 + tools/include/uapi/linux/bpf.h | 10 ++++ tools/lib/bpf/libbpf.c | 1 + .../selftests/bpf/prog_tests/bpf_iter.c | 16 ++++++ .../selftests/bpf/progs/bpf_iter_task.c | 54 +++++++++++++++++++ 9 files changed, 126 insertions(+), 3 deletions(-) -- 2.30.2
