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=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 8664DC43381 for ; Fri, 15 Mar 2019 13:14:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 53274218A1 for ; Fri, 15 Mar 2019 13:14:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552655657; bh=IEpUyL36q8/726NLraqLaGuCSWvp+z1d0IVNkmrGaZc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=RmDf0OM4Bvv++WeS/G6QPIjKPg4mSXflC7+gqaEEKNKtu/CfpZkrpXNADDF8BMO5N 4fRhWwT8nGB20Bq9OmuaMGrlgIIa6ovuYvM3acgPZAfg97qhGc7WZUxdbGvcSviS9i fkbB8FbIEIkwm0AZjrAJaU2W2N74olR+yFkhpiTQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729048AbfCONOR (ORCPT ); Fri, 15 Mar 2019 09:14:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:47594 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726875AbfCONOQ (ORCPT ); Fri, 15 Mar 2019 09:14:16 -0400 Received: from devnote2 (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D1DD021871; Fri, 15 Mar 2019 13:14:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552655656; bh=IEpUyL36q8/726NLraqLaGuCSWvp+z1d0IVNkmrGaZc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=JD/Y36s/ANTZMHwjoVQs98Vc/TdnjKZpxOrd3o8Q5CWbWoEO2OrnHTYQNWf61qD70 QGkzLqvrc9wQunN+3VCCesWkBmuthUsgfLPj2uR4SvrSk38oQPGArH4KmmwgVYePyi bk3S668CcIIgN1QzQLPPn/u+ZkKOY+u2e2b3YWAU= Date: Fri, 15 Mar 2019 22:14:07 +0900 From: Masami Hiramatsu To: Joel Fernandes Cc: Steven Rostedt , Daniel Colascione , Karim Yaghmour , Geert Uytterhoeven , Greg KH , LKML , Andrew Morton , Alexei Starovoitov , atish patra , Dan Williams , Dietmar Eggemann , Guenter Roeck , Jonathan Corbet , Kees Cook , Android Kernel Team , "open list:DOCUMENTATION" , "open list:KERNEL SELFTEST FRAMEWORK" , linux-trace-devel@vger.kernel.org, Manoj Rao , Masahiro Yamada , Qais Yousef , Randy Dunlap , Shuah Khan , Yonghong Song Subject: Re: [PATCH v4 1/2] Provide in-kernel headers for making it easy to extend the kernel Message-Id: <20190315221407.790154f634fc5fc084d7bf15@kernel.org> In-Reply-To: <20190314122748.GA101545@google.com> References: <20190309121141.GA30173@kroah.com> <3e84e1ef-e266-e983-5874-6c26ac7f38b8@opersys.com> <20190311193612.4f09bf11@oasis.local.home> <20190312003912.GA170478@google.com> <20190311212823.60684182@oasis.local.home> <20190313101843.800dd8d6a9babb635580ebdc@kernel.org> <20190314122748.GA101545@google.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.32; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-trace-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org On Thu, 14 Mar 2019 08:27:48 -0400 Joel Fernandes wrote: > > But the eBPF is based on kprobe-events. What kind of usage would you > > expected? (with macros??) > > eBPF C programs are compiled with kernel headers. They can execute inline > functions or refer to macros in the kernel headers. They are similar to > kernel modules where you build a C program that then later is executed in > kernel context. It goes through the whole compiler pipeline. This is slightly > different usage from pure kprobe-events. Also eBPF kprobe programs need > LINUX_VERSION_CODE (or similarly named) macro which it provides to the bpf(2) > syscall when loading kprobe programs. This is because eBPF implementation in > the kernel checks if the eBPF programs that use kprobes are being loaded > against the right kernel. Ah, I got it. It's similar to SystemTap. :) Thank you, -- Masami Hiramatsu