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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 446EAC6FD1F for ; Sat, 30 Mar 2024 12:28:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=aWWd5hlh9htJVfeLOibUWPFdmYfb0AINboFOdN62G00=; b=nAp95iNyJMcS9G rHX2bRi4pEIeHLYSHbLLH6/+1NPTgBZsMFkBtUcY0Xcy0pdA3yfxbeuFOROFdDDhnIUdoYV33uYWn 3iKQsok4Re0v+Ml0PKJ1WZ/kPkW5HLm7TTwJ4h+O9Uu55ZFL2uwZKwdIN0/klkMxY/gvQ8uY3URSz MMFypvqRu+c2+w2qMZ8Hm085dIYE86jRkrePdREs8GubsClzZWxzMJbvhOBDYdiGHRnXlTm8tDXzE ehqjce2v04/g74RXF6bhtF2JqVI5W8dHYSabrww3v56F68LjpqwPfqHSmqpHVbn9y6P5sTSdtpQqR TY9LZzihgseHFm3vPDiw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rqXof-00000003TFL-0kZX; Sat, 30 Mar 2024 12:28:09 +0000 Received: from sin.source.kernel.org ([145.40.73.55]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rqXob-00000003TDm-3QJe; Sat, 30 Mar 2024 12:28:07 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 1642ECE0A2A; Sat, 30 Mar 2024 12:28:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0898C433F1; Sat, 30 Mar 2024 12:27:56 +0000 (UTC) Date: Sat, 30 Mar 2024 08:27:55 -0400 From: Steven Rostedt To: Andrii Nakryiko Cc: =?UTF-8?B?5qKm6b6Z6JGj?= , Alexei Starovoitov , Jiri Olsa , Andrii Nakryiko , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Eddy Z , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , "David S. Miller" , David Ahern , Dave Hansen , X86 ML , Mathieu Desnoyers , Quentin Monnet , bpf , linux-arm-kernel , LKML , linux-riscv , linux-s390 , Network Development , linux-trace-kernel@vger.kernel.org, "open list:KERNEL SELFTEST FRAMEWORK" , linux-stm32@st-md-mailman.stormreply.com Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support to record and check the accessed args Message-ID: <20240330082755.1cbeb8c6@rorschach.local.home> In-Reply-To: References: <20240311093526.1010158-1-dongmenglong.8@bytedance.com> <20240311093526.1010158-2-dongmenglong.8@bytedance.com> <20240328111330.194dcbe5@gandalf.local.home> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240330_052806_041665_26EE04D6 X-CRM114-Status: GOOD ( 11.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 29 Mar 2024 16:28:33 -0700 Andrii Nakryiko wrote: > I thought I'll just ask instead of digging through code, sorry for > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured > before function execution to a return probe (fexit/kretprobe)? I.e., > how hard is it to pass input function arguments to a kretprobe? That's > the biggest advantage of fexit over kretprobe, and if we can make > these original pt_regs/ftrace_regs available to kretprobe, then > multi-kretprobe will effectively be this multi-fexit. This should be possible with the updates that Masami is doing with the fgraph code. -- Steve _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel