Re: [PATCH v2 00/12] Move uid filtering to BPF filters

[Ian Rogers]

On Thu, Apr 10, 2025 at 10:36 AM Ian Rogers <irogers@xxxxxxxxxx> wrote:
>
> Rather than scanning /proc and skipping PIDs based on their UIDs, use
> BPF filters for uid filtering. The /proc scanning in thread_map is
> racy as the PID may exit before the perf_event_open causing perf to
> abort. BPF UID filters are more robust as they avoid the race. Add a
> helper for commands that support UID filtering and wire up. Remove the
> non-BPF UID filtering support given it doesn't work.
>
> v2: Add a perf record uid test (Namhyung) and force setting
>     system-wide for perf trace and perf record (Namhyung). Ensure the
>     uid filter isn't set on tracepoint evsels.
>
> v1: https://lore.kernel.org/lkml/20250111190143.1029906-1-irogers@xxxxxxxxxx/

Ping.

Thanks,
Ian

> Ian Rogers (12):
>   perf tests record: Cleanup improvements
>   perf bench evlist-open-close: Reduce scope of 2 variables
>   perf parse-events filter: Use evsel__find_pmu
>   perf target: Separate parse_uid into its own function
>   perf parse-events: Add parse_uid_filter helper
>   perf record: Switch user option to use BPF filter
>   perf tests record: Add basic uid filtering test
>   perf top: Switch user option to use BPF filter
>   perf trace: Switch user option to use BPF filter
>   perf bench evlist-open-close: Switch user option to use BPF filter
>   perf target: Remove uid from target
>   perf thread_map: Remove uid options
>
>  tools/perf/bench/evlist-open-close.c        | 76 ++++++++++++---------
>  tools/perf/builtin-ftrace.c                 |  1 -
>  tools/perf/builtin-kvm.c                    |  2 -
>  tools/perf/builtin-record.c                 | 27 +++++---
>  tools/perf/builtin-stat.c                   |  4 +-
>  tools/perf/builtin-top.c                    | 22 +++---
>  tools/perf/builtin-trace.c                  | 27 +++++---
>  tools/perf/tests/backward-ring-buffer.c     |  1 -
>  tools/perf/tests/event-times.c              |  8 +--
>  tools/perf/tests/keep-tracking.c            |  2 +-
>  tools/perf/tests/mmap-basic.c               |  2 +-
>  tools/perf/tests/openat-syscall-all-cpus.c  |  2 +-
>  tools/perf/tests/openat-syscall-tp-fields.c |  1 -
>  tools/perf/tests/openat-syscall.c           |  2 +-
>  tools/perf/tests/perf-record.c              |  1 -
>  tools/perf/tests/perf-time-to-tsc.c         |  2 +-
>  tools/perf/tests/shell/record.sh            | 36 ++++++++--
>  tools/perf/tests/switch-tracking.c          |  2 +-
>  tools/perf/tests/task-exit.c                |  1 -
>  tools/perf/tests/thread-map.c               |  2 +-
>  tools/perf/util/bpf-filter.c                |  2 +-
>  tools/perf/util/evlist.c                    |  3 +-
>  tools/perf/util/parse-events.c              | 33 ++++++---
>  tools/perf/util/parse-events.h              |  1 +
>  tools/perf/util/python.c                    | 10 +--
>  tools/perf/util/target.c                    | 54 ++-------------
>  tools/perf/util/target.h                    | 15 +---
>  tools/perf/util/thread_map.c                | 32 +--------
>  tools/perf/util/thread_map.h                |  6 +-
>  tools/perf/util/top.c                       |  4 +-
>  tools/perf/util/top.h                       |  1 +
>  31 files changed, 178 insertions(+), 204 deletions(-)
>
> --
> 2.49.0.604.gff1f9ca942-goog
>