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. v4: Add a warning message on top of Namhyung's BPF filter error message: https://lore.kernel.org/lkml/20250604054234.23608-1-namhyung@xxxxxxxxxx/ in the parse_uid_filter helper. In TUI the warning is shown then the BPF error shown, with stdio the warning appears below the BPF errors. 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 | 47 +++++++++++++----- 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, 164 insertions(+), 182 deletions(-) -- 2.50.0.rc0.604.gd4ff7b7c86-goog
