[PATCH v3 0/3] Use BPF filters for a "perf top -u" workaround

[Ian Rogers]

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