Allow uid and gid to be terms in BPF filters by first breaking the
connection between filter terms and PERF_SAMPLE_xx values. Calculate
the uid and gid using the bpf_get_current_uid_gid helper, rather than
from a value in the sample. Allow filters to be passed to perf top, this allows:
$ perf top -e cycles:P --filter "uid == $(id -u)"
to work as a "perf top -u" workaround, as "perf top -u" usually fails
due to processes/threads terminating between the /proc scan and the
perf_event_open.
v3. Move PERF_SAMPLE_xx asserts to sample_filter.bpf.c to avoid
conflicting definitions between vmlinux.h and perf_event.h as
reported by Namhyung.
v2. Allow PERF_SAMPLE_xx to be computed from the PBF_TERM_xx value
using a shift as requested by Namhyung.
Ian Rogers (3):
perf bpf filter: Give terms their own enum
perf bpf filter: Add uid and gid terms
perf top: Allow filters on events
tools/perf/Documentation/perf-record.txt | 2 +-
tools/perf/Documentation/perf-top.txt | 4 ++
tools/perf/builtin-top.c | 9 +++
tools/perf/util/bpf-filter.c | 33 +++++----
tools/perf/util/bpf-filter.h | 5 +-
tools/perf/util/bpf-filter.l | 66 +++++++++---------
tools/perf/util/bpf-filter.y | 7 +-
tools/perf/util/bpf_skel/sample-filter.h | 40 ++++++++++-
tools/perf/util/bpf_skel/sample_filter.bpf.c | 73 +++++++++++++++-----
9 files changed, 169 insertions(+), 70 deletions(-)
--
2.45.1.288.g0e0cd299f1-goog
