On Wed, Feb 25, 2026 at 1:08 PM Samuel Wu <[email protected]> wrote: > > This patch series introduces BPF iterators for wakeup_source, enabling > BPF programs to efficiently traverse a device's wakeup sources. > > Currently, inspecting wakeup sources typically involves reading interfaces > like /sys/class/wakeup/* or debugfs. The repeated syscalls to query the > sysfs nodes is inefficient, as there can be hundreds of wakeup_sources, and > each wakeup source have multiple stats, with one sysfs node per stat. > debugfs is unstable and insecure. > > The iterators utilize pre-existing wakeup_sources_walk_* functions to > traverse over the SRCU that backs the list of wakeup_sources. > > Changes in v5: > - Add CORE definitions for *__local variables to fix s390 build per bpf-ci > - v4 link: > https://lore.kernel.org/all/[email protected]/ > > Changes in v4: > - Proper init of variables in ws_iter_check_sleep_times() test per bpf-ci > - Remove PM patch since it's already part of rebase > - v3 link: > https://lore.kernel.org/all/[email protected]/ > > Changes in v3: > - Update wakeup_sources_walk_start() to handle an empty list per bpf-ci > - Simplify read of a struct's field in BPF program selftest per Andrii > - Drop open coded iterators for wakeup_sources > - Fix condition from !get_ws_iter_stream to get_ws_iter_stream in selftest > - Read event_count instead of wakeup_count in selftest > - v2 link: > https://lore.kernel.org/all/[email protected]/ > > Changes in v2: > - Guard BPF Makefile with CONFIG_PM_SLEEP to fix build errors > - Update copyright from 2025 to 2026 > - v1 link: > https://lore.kernel.org/all/[email protected]/ > > > Samuel Wu (2): > bpf: Add wakeup_source iterator > selftests/bpf: Add tests for wakeup_sources > > kernel/bpf/Makefile | 3 + > kernel/bpf/wakeup_source_iter.c | 103 ++++++ > tools/testing/selftests/bpf/config | 1 + > .../bpf/prog_tests/wakeup_source_iter.c | 300 ++++++++++++++++++ > .../selftests/bpf/progs/wakeup_source_iter.c | 80 +++++ > 5 files changed, 487 insertions(+) > create mode 100644 kernel/bpf/wakeup_source_iter.c > create mode 100644 > tools/testing/selftests/bpf/prog_tests/wakeup_source_iter.c > create mode 100644 tools/testing/selftests/bpf/progs/wakeup_source_iter.c > > -- > 2.53.0.473.g4a7958ca14-goog >
Hi Andrii, any thoughts on this patchset? I've addressed your suggestion from v2 of this patchset regarding selftest, but nothing fundamental has changed since then. Thanks! Sam
