From nobody Fri Dec 19 09:45:07 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 36C49290BAB for ; Thu, 10 Apr 2025 17:36:59 +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=1744306622; cv=none; b=JekCMZ+VceCebjwuHx2EcF59np3vFZdl6aU2k9Gfmsqfb2hu8ZZMUdgFr9/8C25pj20DHfAAhQRvYkCIEEe3elK4eY+XqBjXuNXMKeTqV7ZkHzg5Px4VgMXKN3ZdSdsrZlJgxHwKo65RoBQcZNgtPkjzT26WDYhE+slc5g2mp40= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744306622; c=relaxed/simple; bh=s5GHscAETkUAKivN7aAi7TLoUIfwAcyInliqpu10XeA=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Content-Type; b=bq0M9B0gZCLEmRgzLchtIoPKQjoKB5HU40xi7uTweVzqKuGxyMvE4EBPfvtoIMKibK6o7d/hdd9BQcYSBvcBJBB+/LS+x3LWllU9EqAJJRSQx1eCevfSmlSZ2TCgGVeBWtOVEPK1dtapUSimCOBCGZqYJp4w5/mnCxio+Ho18I8= 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=IZODvNjD; 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="IZODvNjD" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-2254bdd4982so14759445ad.1 for ; Thu, 10 Apr 2025 10:36:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1744306619; x=1744911419; 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=ZpYG+riLDNowuBXALSOK3FRVNiACEEuoxpGzRk7BH3E=; b=IZODvNjDHhp0hVT1YiiOpynOIh0lai1bmUA25aAwSe2DiF8tmSDoMXP+6IA6TfJe7C alnO7R1SeMQzjnn0HlRsMCKP73WXdV6cgSXQjUgXLLRXx5nGSR6MB8AT1sfWlQRuv8Dj n/vN7pZAamWmH0eGWnQhZXedti7u1FWP+CncjYUf7CIzdFEnu89O/efi02OBzBYhEmGX vVnyKcsEDULqUM/IeuGouj8GXqvNqAjwy9/PtYS2kBoFVWFDvz+2eNzT+MqfOSWwuKVK iLKBK2qGw0JJNe+3FacBkw9AJiI1SSntNucpFhum3zS5fgckYb0QYoaKZ6DeaFWEgtA6 3h8Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744306619; x=1744911419; 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=ZpYG+riLDNowuBXALSOK3FRVNiACEEuoxpGzRk7BH3E=; b=a2hz0p8TAnPBY/P8yvhFWT0UY8FXBe31lGPPessjNwaikQYcS/RTC5xwTrh5TTlA4B Fa89GinKqKiZpqAki8lx8Gp70tc1QngW33rUkHlqg7uN/Vx3v0QQkpCM+RUbg/qMcIcy m7Q938+fsKLWB6vftZT9LytSnm7BilHnLZeqB21l76N0nW4eUqwfsUqOAhx9KbwFgQCC WASqL/e1VkWfMWHiJ6otDdouSMUiD5TW/2ovVVLbywYL51jv0LmG5bAkfIqomU8BOfMd 8y8mVMosHvBr1FT1FggYpVU9XR+TgacJIsWLFVd/YN/qIFpww3TkI+cFu+WRNlNHcqkP hIew== X-Forwarded-Encrypted: i=1; AJvYcCW0xR1YtDhGj7PXgEyzPv1xlgIq19wpqxoruukanhA8KkhLU2z0ofmRGzYMtu6ZcQzwxr7Q3XZYL8lcmxM=@vger.kernel.org X-Gm-Message-State: AOJu0YwZVACFgyZ+/xACoUq7YvoUxS1ih0XhzUTbrQIF3yJwGtaRwSXc 4lE3yPt0AZpOd9Om4KOm5IEE/np2QIDcOFK5OfMjC9Z0qDBOEzsGP6G4YiSW4Ek197G0nOYoCSk 7P/Q0pQ== X-Google-Smtp-Source: AGHT+IGzIUP6D1cwLaSTj/gUi3pDoC4nLxOcZuHx9s7cibZ6nls36gURzWSfZGyGYDQBNmN1hxObG/FtTqx1 X-Received: from plge17.prod.google.com ([2002:a17:902:cf51:b0:223:242b:480a]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:948:b0:224:10a2:cad5 with SMTP id d9443c01a7336-22b2eda468bmr66678385ad.10.1744306619427; Thu, 10 Apr 2025 10:36:59 -0700 (PDT) Date: Thu, 10 Apr 2025 10:36:27 -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: <20250410173631.1713627-9-irogers@google.com> Subject: [PATCH v2 08/12] perf top: 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. Signed-off-by: Ian Rogers --- tools/perf/builtin-top.c | 22 ++++++++++++---------- tools/perf/util/top.c | 4 ++-- tools/perf/util/top.h | 1 + 3 files changed, 15 insertions(+), 12 deletions(-) diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 1061f4eebc3f..9a7af69b7c73 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -642,7 +642,7 @@ static void *display_thread_tui(void *arg) */ evlist__for_each_entry(top->evlist, pos) { struct hists *hists =3D evsel__hists(pos); - hists->uid_filter_str =3D top->record_opts.target.uid_str; + hists->uid_filter_str =3D top->uid_str; } =20 ret =3D evlist__tui_browse_hists(top->evlist, help, &hbt, top->min_percen= t, @@ -1566,7 +1566,7 @@ int cmd_top(int argc, const char **argv) "Add prefix to source file path names in programs (with --prefix-str= ip)"), OPT_STRING(0, "prefix-strip", &annotate_opts.prefix_strip, "N", "Strip first N entries of source file path name in programs (with --= prefix)"), - OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"), + OPT_STRING('u', "uid", &top.uid_str, "user", "user to profile"), OPT_CALLBACK(0, "percent-limit", &top, "percent", "Don't show entries under that percent", parse_percent_limit), OPT_CALLBACK(0, "percentage", NULL, "relative|absolute", @@ -1757,15 +1757,17 @@ int cmd_top(int argc, const char **argv) ui__warning("%s\n", errbuf); } =20 - status =3D target__parse_uid(target); - if (status) { - int saved_errno =3D errno; - - target__strerror(target, status, errbuf, BUFSIZ); - ui__error("%s\n", errbuf); + if (top.uid_str) { + uid_t uid =3D parse_uid(top.uid_str); =20 - status =3D -saved_errno; - goto out_delete_evlist; + if (uid =3D=3D UINT_MAX) { + ui__error("Invalid User: %s", top.uid_str); + status =3D -EINVAL; + goto out_delete_evlist; + } + status =3D parse_uid_filter(top.evlist, uid); + if (status) + goto out_delete_evlist; } =20 if (target__none(target)) diff --git a/tools/perf/util/top.c b/tools/perf/util/top.c index 4db3d1bd686c..b06e10a116bb 100644 --- a/tools/perf/util/top.c +++ b/tools/perf/util/top.c @@ -88,9 +88,9 @@ size_t perf_top__header_snprintf(struct perf_top *top, ch= ar *bf, size_t size) else if (target->tid) ret +=3D SNPRINTF(bf + ret, size - ret, " (target_tid: %s", target->tid); - else if (target->uid_str !=3D NULL) + else if (top->uid_str !=3D NULL) ret +=3D SNPRINTF(bf + ret, size - ret, " (uid: %s", - target->uid_str); + top->uid_str); else ret +=3D SNPRINTF(bf + ret, size - ret, " (all"); =20 diff --git a/tools/perf/util/top.h b/tools/perf/util/top.h index 4c5588dbb131..04ff926846be 100644 --- a/tools/perf/util/top.h +++ b/tools/perf/util/top.h @@ -48,6 +48,7 @@ struct perf_top { const char *sym_filter; float min_percent; unsigned int nr_threads_synthesize; + const char *uid_str; =20 struct { struct ordered_events *in; --=20 2.49.0.604.gff1f9ca942-goog