From mboxrd@z Thu Jan 1 00:00:00 1970 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 AB66DC4741F for ; Wed, 30 Sep 2020 22:49:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A01B21734 for ; Wed, 30 Sep 2020 22:49:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="TwnkyQHC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731838AbgI3Wt4 (ORCPT ); Wed, 30 Sep 2020 18:49:56 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:32222 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731828AbgI3Wtz (ORCPT ); Wed, 30 Sep 2020 18:49:55 -0400 Received: from pps.filterd (m0148460.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 08UMnpX8001668 for ; Wed, 30 Sep 2020 15:49:54 -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=5xIBFdyzJm/dsFEH5KDFJM344HtZUaE4KWCV2yVaNzQ=; b=TwnkyQHCfUdRADpUYoahv1yURgf8lZ/5spHEzijCtbwaEVDwDUMJjIOP8bY4USWF3AcM jCSe+MYIy39YCKB/lmQUtQwNEppVuciF1p+4OwcL22DxnSEjlYaZEblkRV8iE5Fqx52r EB3nM4Cu+F33kHdZy8SfeN2vxTCNJhDG6j8= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 33vvgrjfw3-6 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 30 Sep 2020 15:49:54 -0700 Received: from intmgw005.03.ash8.facebook.com (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c085:11d::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 15:49:52 -0700 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 94DEB62E586A; Wed, 30 Sep 2020 15:49:50 -0700 (PDT) From: Song Liu To: , CC: , , , , , Song Liu Subject: [PATCH v5 bpf-next 0/2] introduce BPF_F_PRESERVE_ELEMS Date: Wed, 30 Sep 2020 15:49:25 -0700 Message-ID: <20200930224927.1936644-1-songliubraving@fb.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain 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 priorityscore=1501 clxscore=1015 phishscore=0 mlxscore=0 bulkscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 adultscore=0 mlxlogscore=959 suspectscore=2 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009300184 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@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 even= t when the map fd used to add the event is closed. With BPF_F_PRESERVE_ELEM= S set, however, the perf event will stay in the array until it is removed, = or the map is closed. --- Changes v3 =3D> v5: 1. Clean up in selftest. (Alexei) Changes v2 =3D> v3: 1. Move perf_event_fd_array_map_free() to avoid unnecessary forward declaration. (Daniel) Changes v1 =3D> 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 | 42 ++++++++++++ 5 files changed, 131 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/pe_preserve_el= ems.c create mode 100644 tools/testing/selftests/bpf/progs/test_pe_preserve_el= ems.c -- 2.24.1