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

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Message-Id: <20240524205227.244375-1-irogers@google.com>
Date: Fri, 24 May 2024 13:52:24 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Changbin Du <changbin.du@...wei.com>, 
	Yang Jihong <yangjihong1@...wei.com>, Andrii Nakryiko <andrii@...nel.org>, 
	John Fastabend <john.fastabend@...il.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH v3 0/3] Use BPF filters for a "perf top -u" workaround

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