From patchwork Wed Sep 30 21:28:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 259799 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DAD96C4363D for ; Wed, 30 Sep 2020 21:28:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6C5D72072E for ; Wed, 30 Sep 2020 21:28:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="gNLGNG7p" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730151AbgI3V2f (ORCPT ); Wed, 30 Sep 2020 17:28:35 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:16750 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725814AbgI3V2f (ORCPT ); Wed, 30 Sep 2020 17:28:35 -0400 Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 08ULQE0W016890 for ; Wed, 30 Sep 2020 14:28:35 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding : content-type; s=facebook; bh=kV+eVQTJKGfQZkTsTSLD9VslUqqseHewflDXTHv0Zqw=; b=gNLGNG7p7HHxDnl6AJvYYoPnJkQhXvRXpIHlZwyqYy5e6OOOOIX3JyOxTS1sLui5pqvM ckJbTYXIYdU7YnF5lXjHw4YWRw7bN740/bH9c0b5zL0gs2OkvhA7u+Qk2LN/qr14JkQh cqvw3lLiFB/bkO7QflPlBOYD6/SQUNWMkLI= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 33v6v48fnt-18 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 30 Sep 2020 14:28:34 -0700 Received: from intmgw003.03.ash8.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Wed, 30 Sep 2020 14:28:33 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 2F64062E585F; Wed, 30 Sep 2020 14:28:32 -0700 (PDT) From: Song Liu To: , CC: , , , , , Song Liu Subject: [PATCH v4 bpf-next 0/2] introduce BPF_F_PRESERVE_ELEMS Date: Wed, 30 Sep 2020 14:28:22 -0700 Message-ID: <20200930212824.1418683-1-songliubraving@fb.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-30_13:2020-09-30,2020-09-30 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 adultscore=0 malwarescore=0 mlxscore=0 impostorscore=0 spamscore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 mlxlogscore=960 phishscore=0 suspectscore=2 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009300174 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This set introduces BPF_F_PRESERVE_ELEMS to perf event array for better sharing of perf event. By default, perf event array removes the perf event when the map fd used to add the event is closed. With BPF_F_PRESERVE_ELEMS set, however, the perf event will stay in the array until it is removed, or the map is closed. --- Changes v2 => v3: 1. Clean up in selftest. (Alexei) Changes v2 => v3: 1. Move perf_event_fd_array_map_free() to avoid unnecessary forward declaration. (Daniel) Changes v1 => v2: 1. Rename the flag as BPF_F_PRESERVE_ELEMS. (Alexei, Daniel) 2. Simplify the code and selftest. (Daniel, Alexei) Song Liu (2): bpf: introduce BPF_F_PRESERVE_ELEMS for perf event array selftests/bpf: add tests for BPF_F_PRESERVE_ELEMS include/uapi/linux/bpf.h | 3 + kernel/bpf/arraymap.c | 19 +++++- tools/include/uapi/linux/bpf.h | 3 + .../bpf/prog_tests/pe_preserve_elems.c | 66 +++++++++++++++++++ .../bpf/progs/test_pe_preserve_elems.c | 44 +++++++++++++ 5 files changed, 133 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/pe_preserve_elems.c create mode 100644 tools/testing/selftests/bpf/progs/test_pe_preserve_elems.c -- 2.24.1