[PATCH v3 00/10] Move uid filtering to BPF filters

From: Ian Rogers
Date: Fri Apr 25 2025 - 17:40:37 EST


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. The
/proc scanning also misses processes starting after the perf
command. Add a helper for commands that support UID filtering and wire
up. Remove the non-BPF UID filtering support given it doesn't work.

v3: Add lengthier commit messages as requested by Arnaldo. Rebase on
tmp.perf-tools-next.

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/

Ian Rogers (10):
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 | 36 ++++++++------
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 | 26 ++++++++++
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, 150 insertions(+), 182 deletions(-)

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2.49.0.850.g28803427d3-goog