From nobody Fri Dec 19 09:44:47 2025 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 16275290BC3 for ; Thu, 10 Apr 2025 17:37:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744306623; cv=none; b=qZMMpkQQepa2StCDiGLlg9uc2TNIZA3nmyMBoMtVDxABtKvL/VgDq+hyKvYQSuGxR5aojd8YNJghhKj1fWNlKhwBrtKSQHrtBITnp1nB996ZMhv/WiK+dBl8hEkyVblhsqEbpREvuulP7/lnj8LPzKMKHhavczMzG0GFjOCkYzg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744306623; c=relaxed/simple; bh=pwnF8n7mqD7yk9oNBMquJdU4/lh8MdFnDzv/GA7kVio=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Content-Type; b=e6G0X6EVKQ/GODO2108HDrKdPixe7vmAH/X/pbfU04jWFNmNkHpSLjFGbOb96v2R0cNPRZfZ9FYC68eXK6mkUKH8IA/qh99BQGlAHoviUT/Svm2Rkcz2J0JPZlOmhciAYe5qFcB1ug/VDUtJQJDm2rh4MtBHrwbPTD6dCArwq3U= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=h3fKEn+P; arc=none smtp.client-ip=209.85.214.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="h3fKEn+P" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-225107fbdc7so9605705ad.0 for ; Thu, 10 Apr 2025 10:37:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1744306621; x=1744911421; darn=vger.kernel.org; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :from:to:cc:subject:date:message-id:reply-to; bh=XpiUUvwlwp9tVCnJZ3TZUgEjsv1IVM8EEnnesVuXazs=; b=h3fKEn+Pz6OSFVCpDOszljZHfQXr0dLfzJkdBcKvgw+KCKrIsC8oXNEnmAsSqd9rEf JsmxFNiaOJRHgiYwgxRXodaSSnIs1hr5cDAri1SxncQ/BpUsvBqXNtW3IrExpseTdSz3 QmNbeiQ+bw2+aRuD1TAt/k4m89qeFxvhZLSHgrzKwq6zPlOEMzPHk68PBwMjpPjTmoO9 Mek7uXnINWAXZspY8ey7YOW+xQtODVaeCKzoEe07KFsCU2XTCuX7Nl8/gFGGCmDcRGpR T8HgJiYrvAlRIfhKkvcoqm4N3JLm7jiQbv1O7jENLfE7pvjmp/BhVIFiBT+RJ3PbpnAj wg2A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744306621; x=1744911421; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=XpiUUvwlwp9tVCnJZ3TZUgEjsv1IVM8EEnnesVuXazs=; b=p96swArIuufV57kteHhaG7jGHs2kCL+8bqbXZOwzC5E4WK1jTr3/HVQn1fpi+kOr0W ZkTncK/TfqXBMuwDhwAeI8/1AOl2w94P8NfS1eEP46oP8QE+u7jo/23KzoMHhtEJ54/r iSazgj5th3sVtrvOsKxmONZsKJGNntPaudrgeGTuFNpqQkMPx7Kn1LLzjgdkASPVVPB9 CG2IVuvjKoD/UjtOzDcF1Tdj/UIE9Xte35VDnZkEKL+d2IobAYYMkbOV5rjMtdyaNALl cAXoslxA5Nu+wuGQ3NlQ74enrDzdCMyALPwNn9NXW/utqhqO0RBtC1n8N1CjA8AuI2A5 dm7Q== X-Forwarded-Encrypted: i=1; AJvYcCW2Wpb3EcFVoZSjmeP8orqe9HlfsTb7sJsnVTqki5Wki5mvYele4cSRsmGjO15vQVSVSbmUf4aPYbMcQNc=@vger.kernel.org X-Gm-Message-State: AOJu0YzBciAWc2LVqVfR6GeNBXVLrXMj5+Xl6KRh/eYGvOC206Dp4LnD POKDVJgAE37/gmc8gQyGSTQWl80iI3SKGiU1WzUqWIL4Qv921ulMvCcpUM4OXwkVU2hAMII6ekH RWEe2rQ== X-Google-Smtp-Source: AGHT+IFwaCb2cDgkGC1n4/9Wz8pIMyxoLX83dVD19SJR7ZPEQ36S8XM3cNeUAEqdxlEjEYtd+dxtn/hNSjdL X-Received: from plbml15.prod.google.com ([2002:a17:903:34cf:b0:227:b826:af9e]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:120a:b0:216:2bd7:1c2f with SMTP id d9443c01a7336-22be02f73bamr41067965ad.18.1744306621413; Thu, 10 Apr 2025 10:37:01 -0700 (PDT) Date: Thu, 10 Apr 2025 10:36:28 -0700 In-Reply-To: <20250410173631.1713627-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250410173631.1713627-1-irogers@google.com> X-Mailer: git-send-email 2.49.0.604.gff1f9ca942-goog Message-ID: <20250410173631.1713627-10-irogers@google.com> Subject: [PATCH v2 09/12] perf trace: Switch user option to use BPF filter From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , James Clark , Dapeng Mi , Thomas Richter , Veronika Molnarova , Hao Ge , Howard Chu , Weilin Wang , Levi Yun , "Dr. David Alan Gilbert" , Dominique Martinet , Xu Yang , Tengda Wu , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Finding user processes by scanning /proc is inherently racy and results in perf_event_open failures. Use a BPF filter to drop samples where the uid doesn't match. Ensure adding the BPF filter forces system-wide. Signed-off-by: Ian Rogers --- tools/perf/builtin-trace.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 6ac51925ea42..1f7d2b3d8b3d 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -240,6 +240,7 @@ struct trace { struct ordered_events data; u64 last; } oe; + const char *uid_str; }; =20 static void trace__load_vmlinux_btf(struct trace *trace __maybe_unused) @@ -4401,8 +4402,8 @@ static int trace__run(struct trace *trace, int argc, = const char **argv) evlist__add(evlist, pgfault_min); } =20 - /* Enable ignoring missing threads when -u/-p option is defined. */ - trace->opts.ignore_missing_thread =3D trace->opts.target.uid !=3D UINT_MA= X || trace->opts.target.pid; + /* Enable ignoring missing threads when -p option is defined. */ + trace->opts.ignore_missing_thread =3D trace->opts.target.pid; =20 if (trace->sched && evlist__add_newtp(evlist, "sched", "sched_stat_runtime", trace__sched= _stat_runtime)) @@ -5420,8 +5421,7 @@ int cmd_trace(int argc, const char **argv) "child tasks do not inherit counters"), OPT_CALLBACK('m', "mmap-pages", &trace.opts.mmap_pages, "pages", "number of mmap data pages", evlist__parse_mmap_pages), - OPT_STRING('u', "uid", &trace.opts.target.uid_str, "user", - "user to profile"), + OPT_STRING('u', "uid", &trace.uid_str, "user", "user to profile"), OPT_CALLBACK(0, "duration", &trace, "float", "show only events with duration > N.M ms", trace__set_duration), @@ -5762,11 +5762,19 @@ int cmd_trace(int argc, const char **argv) goto out_close; } =20 - err =3D target__parse_uid(&trace.opts.target); - if (err) { - target__strerror(&trace.opts.target, err, bf, sizeof(bf)); - fprintf(trace.output, "%s", bf); - goto out_close; + if (trace.uid_str) { + uid_t uid =3D parse_uid(trace.uid_str); + + if (uid =3D=3D UINT_MAX) { + ui__error("Invalid User: %s", trace.uid_str); + err =3D -EINVAL; + goto out_close; + } + err =3D parse_uid_filter(trace.evlist, uid); + if (err) + goto out_close; + + trace.opts.target.system_wide =3D true; } =20 if (!argc && target__none(&trace.opts.target)) --=20 2.49.0.604.gff1f9ca942-goog