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Mon, 16 Nov 2020 21:02:18 +0000 Date: Mon, 16 Nov 2020 13:02:09 -0800 From: Martin KaFai Lau To: Florian Lehner CC: , , , , , , , , , Subject: Re: [FIX bpf,perf] bpf,perf: return EOPNOTSUPP for bpf handler on PERF_COUNT_SW_DUMMY Message-ID: <20201116210209.skeolnndx3gk2xav@kafai-mbp.dhcp.thefacebook.com> References: <20201116183752.2716-1-dev@der-flo.net> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201116183752.2716-1-dev@der-flo.net> X-Originating-IP: [2620:10d:c090:400::5:8f7f] X-ClientProxiedBy: CO2PR18CA0045.namprd18.prod.outlook.com (2603:10b6:104:2::13) To BY5PR15MB3571.namprd15.prod.outlook.com (2603:10b6:a03:1f6::32) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from kafai-mbp.dhcp.thefacebook.com (2620:10d:c090:400::5:8f7f) by CO2PR18CA0045.namprd18.prod.outlook.com (2603:10b6:104:2::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3564.25 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-MS-Exchange-CrossTenant-Network-Message-Id: 88b29657-0db4-4161-f390-08d88a72e6e5 X-MS-Exchange-CrossTenant-AuthSource: BY5PR15MB3571.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Nov 2020 21:02:18.0178 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: tdArEQ6fCd22JEQD9M8yjsPgeR0rE9as7w8kNeHmjeZTj5BdXhm+GW1OjopHf/mW X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB3256 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-11-16_11:2020-11-13,2020-11-16 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 malwarescore=0 lowpriorityscore=0 clxscore=1011 priorityscore=1501 mlxscore=0 suspectscore=1 adultscore=0 phishscore=0 mlxlogscore=744 spamscore=0 bulkscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011160124 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 16, 2020 at 07:37:52PM +0100, Florian Lehner wrote: > bpf handlers for perf events other than tracepoints, kprobes or uprobes > are attached to the overflow_handler of the perf event. > > Perf events of type software/dummy are placeholder events. So when > attaching a bpf handle to an overflow_handler of such an event, the bpf > handler will not be triggered. > > This fix returns the error EOPNOTSUPP to indicate that attaching a bpf > handler to a perf event of type software/dummy is not supported. > > Signed-off-by: Florian Lehner It is missing a Fixes tag.