Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752114AbbH2Bem (ORCPT ); Fri, 28 Aug 2015 21:34:42 -0400 Received: from mail-pa0-f45.google.com ([209.85.220.45]:36128 "EHLO mail-pa0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751543AbbH2Bek (ORCPT ); Fri, 28 Aug 2015 21:34:40 -0400 Subject: Re: [PATCH 32/32] bpf: Introduce function for outputing data to perf event To: "Wangnan (F)" , acme@redhat.com References: <1440745570-150857-1-git-send-email-wangnan0@huawei.com> <1440745570-150857-33-git-send-email-wangnan0@huawei.com> <55E10091.6020107@plumgrid.com> <55E108BC.4050107@huawei.com> Cc: brendan.d.gregg@gmail.com, daniel@iogearbox.net, dsahern@gmail.com, hekuang@huawei.com, jolsa@kernel.org, xiakaixu@huawei.com, masami.hiramatsu.pt@hitachi.com, namhyung@kernel.org, a.p.zijlstra@chello.nl, lizefan@huawei.com, pi3orama@163.com, linux-kernel@vger.kernel.org, Arnaldo Carvalho de Melo , Ingo Molnar , Steven Rostedt From: Alexei Starovoitov Message-ID: <55E10C2D.5090300@plumgrid.com> Date: Fri, 28 Aug 2015 18:34:37 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <55E108BC.4050107@huawei.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 845 Lines: 17 On 8/28/15 6:19 PM, Wangnan (F) wrote: > For me, I use bpf_output_trace_data() to output information like PMU count > value. Perf is the only receiver, so global collector is perfect. Could you > please describe your usecase in more detail? there is a special receiver in user space that only wants the data from the bpf program that it loaded. It shouldn't conflict with any other processes. Like when it's running, I still should be able to use perf for other performance analysis. There is no way to share single bpf:bpf_output_data event, since these user processes are completely independent. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/