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[94.113.247.30]) by smtp.gmail.com with ESMTPSA id b20-20020aa7cd14000000b0056bf9b4ec32sm3516637edw.78.2024.03.30.10.52.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 30 Mar 2024 10:52:33 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Sat, 30 Mar 2024 18:52:30 +0100 To: Steven Rostedt Cc: Andrii Nakryiko , =?utf-8?B?5qKm6b6Z6JGj?= , Alexei Starovoitov , 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: References: <20240328111330.194dcbe5@gandalf.local.home> <20240330082755.1cbeb8c6@rorschach.local.home> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240330082755.1cbeb8c6@rorschach.local.home> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote: > 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. yes, I have bpf kprobe-multi link support for that [0] (it's on top of Masami's fprobe-over-fgraph changes) we discussed that in [1] jirka [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/ 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 CACBAC6FD1F for ; Sat, 30 Mar 2024 17:52:51 +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:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=gLZ0JqMbJuZyOB6NJy+eOXtpec9Ta7q+V+f1JSFsqJ8=; b=l3Fiugm81FN0pq jBoaUqKcePYDdhA8eeyz2ZuY1asKE5kfwyx99toB5SaA/24qPfjN5Odyre0rPj3n+0K4pY3t+T/nL 6/M+M61BehAkSSLM1IoFBDWNpDRt80W7oBgDYFUYGq7c0oYuxSFMYhQaXpowJX6ZdC2FL80GqYZd7 aMAV51tAKMkEuRK1PdGrg469jWBltrp8moqJ6Vtal02DdwV9fsaHGeDYnCvsZttRMkm4nYFmGq4ac IQi7USok22RAV+E7pCJujkx21jugXagbNOmmoqHRW/V/vPH8lH5H5KK0Sl9tRqAYsgEVxpS1EPoc7 CEHQTFhONtV28DjqE9mg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rqcsk-00000003tnL-1FPk; Sat, 30 Mar 2024 17:52:42 +0000 Received: from mail-ed1-x534.google.com ([2a00:1450:4864:20::534]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rqcsf-00000003tla-34fQ; Sat, 30 Mar 2024 17:52:39 +0000 Received: by mail-ed1-x534.google.com with SMTP id 4fb4d7f45d1cf-56bf63af770so1494225a12.3; Sat, 30 Mar 2024 10:52:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1711821154; x=1712425954; darn=lists.infradead.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:date:from:from:to:cc:subject:date:message-id:reply-to; bh=Dd1Ju+LCh2MPv5vAR1VJsB6sgx1pw4Hx1J299NMUFnM=; b=m3XPukv2g8ZHIiNHjbZuTGb5xkSDCzzZt2vyMBbNXiHjOy77CSSjq0g8Ii3YPD0MCB SAvycctBDVelhej6gkTXYbHSe5LabyrtdQyPW4aP5IZ4dl721iV+048CZFYdYXeM75tp rZHE8INnrDq/oCd08tZ0VTvhgzqfFMasztggEDIofga5tUsLSIYHy/L7laY1HzFz6SXq NMJcIS4JT/ItnQg8j9Ynw1oWdM42mt3fQZzx5wnvEQ2pfI4MVjBiy2rEqwW0jVFyvEUA A94l7Kh7AKjW0UNSROs5Q9srSou6Fu9x8bDxjesHaFfQE/b/z/1c2se2O1v7pd9LhAAv vDwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711821154; x=1712425954; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:date:from:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=Dd1Ju+LCh2MPv5vAR1VJsB6sgx1pw4Hx1J299NMUFnM=; b=j9iMUDUal2hGDBL0GSVuoIFSvPVkyrDCuBNPaAKN2vejbn5Sz39kc9VVIYWtOnKGqC 6qsw6tBytsZ4hCV8xVmUwGqeJw03dFU3r5JpUrnsBNMk6OT/lRAklwrgOC+8fwjQub7g ROx6VyLHBr2WPXkBDMXzww7Bdzi/Y4SeoyXMsstmd+AoMHkFzTBEBwNFO1D4PLoeMrzQ KbH1vnkZAmN4d6tpFFjRYuydYAz4sys886uqy7Df3BobJ0hGo/yGekLMAsph/jykeJz1 YezAbFUFhTk5FzwupyQrCCbe1m2mxmELkxOVGKJQ2cxLURbVwiA1VNPNtzOZ+Df3oERU Q7YQ== X-Forwarded-Encrypted: i=1; AJvYcCXZsjubRd+DAiX64irVcIO+vYPofjiNwk6sd6ajeJWprtf7e0o4iiN4WKEQPuiU2HNuLJgg+dFZ4WO82trcQjAn0ygPmijtQP/h45xi6fG/7eTW2r3SNZXpAKLFEj6PsGJZOdAy77VVNYN6ePHaB3vOUeV5deo= X-Gm-Message-State: AOJu0Yzy3gJUTSggCz90My5eP0Zwf5v9+WCSjYcD1QAlpVQNWkotsho0 +/KO7EO4n1xIhTfj/SM9EUCjzA8OHkPrpllF3BjtxQtVzsc0inmp X-Google-Smtp-Source: AGHT+IEGAmf0kvvH3dm+5STvdXDGmaMLsXGzvzIXptUqdCRcniCaiSzPtCwt9Qd53mlg93swhXFVXQ== X-Received: by 2002:a50:8ad9:0:b0:566:b09e:8d24 with SMTP id k25-20020a508ad9000000b00566b09e8d24mr4080922edk.12.1711821153955; Sat, 30 Mar 2024 10:52:33 -0700 (PDT) Received: from krava (ip-94-113-247-30.net.vodafone.cz. [94.113.247.30]) by smtp.gmail.com with ESMTPSA id b20-20020aa7cd14000000b0056bf9b4ec32sm3516637edw.78.2024.03.30.10.52.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 30 Mar 2024 10:52:33 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Sat, 30 Mar 2024 18:52:30 +0100 To: Steven Rostedt Cc: Andrii Nakryiko , =?utf-8?B?5qKm6b6Z6JGj?= , Alexei Starovoitov , 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: References: <20240328111330.194dcbe5@gandalf.local.home> <20240330082755.1cbeb8c6@rorschach.local.home> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20240330082755.1cbeb8c6@rorschach.local.home> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240330_105237_803120_16F63AB9 X-CRM114-Status: GOOD ( 14.67 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote: > 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. yes, I have bpf kprobe-multi link support for that [0] (it's on top of Masami's fprobe-over-fgraph changes) we discussed that in [1] jirka [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/ _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv 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 BEC7ACD1288 for ; Sat, 30 Mar 2024 17:52:55 +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:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=L+hQMcfM7StiujUrNDjoz/qKVksP/epRb7O6j6f6ebs=; b=bLPJvlA3jHCiti MhTWB9pJ5IPIhsXUODkIxqNpwI/fhqQkH9/Uf+neSkvPEO6OgtefI85JEh3aafispt2wv/mOkQ7l+ uec4AcL//TwLrsuy1KsFr2TCIPezE4X+wgSiMhdBRA9YvCM8g3KMyhIg5nuCGpgvUUAqcBwPi6y14 gN/cpj1sHDfwKWbzDtY15RZRq+81hRUDt/EnALwotmiH7UdHcmKIZLUg6SdJYpVc+Igf6KvxIQRtZ PgnhQNy5keabVZo4vp4N45qOJ4t7342hI2lfaS6Srz6fJKQ5iCFPwqVbfaiHxuNjSgKboUTrNI4EW LeyHYv6b0BeVIiWIRc5w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rqcsj-00000003tn7-2l9Q; Sat, 30 Mar 2024 17:52:41 +0000 Received: from mail-ed1-x534.google.com ([2a00:1450:4864:20::534]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rqcsf-00000003tla-34fQ; Sat, 30 Mar 2024 17:52:39 +0000 Received: by mail-ed1-x534.google.com with SMTP id 4fb4d7f45d1cf-56bf63af770so1494225a12.3; Sat, 30 Mar 2024 10:52:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1711821154; x=1712425954; darn=lists.infradead.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:date:from:from:to:cc:subject:date:message-id:reply-to; bh=Dd1Ju+LCh2MPv5vAR1VJsB6sgx1pw4Hx1J299NMUFnM=; b=m3XPukv2g8ZHIiNHjbZuTGb5xkSDCzzZt2vyMBbNXiHjOy77CSSjq0g8Ii3YPD0MCB SAvycctBDVelhej6gkTXYbHSe5LabyrtdQyPW4aP5IZ4dl721iV+048CZFYdYXeM75tp rZHE8INnrDq/oCd08tZ0VTvhgzqfFMasztggEDIofga5tUsLSIYHy/L7laY1HzFz6SXq NMJcIS4JT/ItnQg8j9Ynw1oWdM42mt3fQZzx5wnvEQ2pfI4MVjBiy2rEqwW0jVFyvEUA A94l7Kh7AKjW0UNSROs5Q9srSou6Fu9x8bDxjesHaFfQE/b/z/1c2se2O1v7pd9LhAAv vDwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711821154; x=1712425954; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:date:from:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=Dd1Ju+LCh2MPv5vAR1VJsB6sgx1pw4Hx1J299NMUFnM=; b=j9iMUDUal2hGDBL0GSVuoIFSvPVkyrDCuBNPaAKN2vejbn5Sz39kc9VVIYWtOnKGqC 6qsw6tBytsZ4hCV8xVmUwGqeJw03dFU3r5JpUrnsBNMk6OT/lRAklwrgOC+8fwjQub7g ROx6VyLHBr2WPXkBDMXzww7Bdzi/Y4SeoyXMsstmd+AoMHkFzTBEBwNFO1D4PLoeMrzQ KbH1vnkZAmN4d6tpFFjRYuydYAz4sys886uqy7Df3BobJ0hGo/yGekLMAsph/jykeJz1 YezAbFUFhTk5FzwupyQrCCbe1m2mxmELkxOVGKJQ2cxLURbVwiA1VNPNtzOZ+Df3oERU Q7YQ== X-Forwarded-Encrypted: i=1; AJvYcCXZsjubRd+DAiX64irVcIO+vYPofjiNwk6sd6ajeJWprtf7e0o4iiN4WKEQPuiU2HNuLJgg+dFZ4WO82trcQjAn0ygPmijtQP/h45xi6fG/7eTW2r3SNZXpAKLFEj6PsGJZOdAy77VVNYN6ePHaB3vOUeV5deo= X-Gm-Message-State: AOJu0Yzy3gJUTSggCz90My5eP0Zwf5v9+WCSjYcD1QAlpVQNWkotsho0 +/KO7EO4n1xIhTfj/SM9EUCjzA8OHkPrpllF3BjtxQtVzsc0inmp X-Google-Smtp-Source: AGHT+IEGAmf0kvvH3dm+5STvdXDGmaMLsXGzvzIXptUqdCRcniCaiSzPtCwt9Qd53mlg93swhXFVXQ== X-Received: by 2002:a50:8ad9:0:b0:566:b09e:8d24 with SMTP id k25-20020a508ad9000000b00566b09e8d24mr4080922edk.12.1711821153955; Sat, 30 Mar 2024 10:52:33 -0700 (PDT) Received: from krava (ip-94-113-247-30.net.vodafone.cz. [94.113.247.30]) by smtp.gmail.com with ESMTPSA id b20-20020aa7cd14000000b0056bf9b4ec32sm3516637edw.78.2024.03.30.10.52.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 30 Mar 2024 10:52:33 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Sat, 30 Mar 2024 18:52:30 +0100 To: Steven Rostedt Cc: Andrii Nakryiko , =?utf-8?B?5qKm6b6Z6JGj?= , Alexei Starovoitov , 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: References: <20240328111330.194dcbe5@gandalf.local.home> <20240330082755.1cbeb8c6@rorschach.local.home> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20240330082755.1cbeb8c6@rorschach.local.home> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240330_105237_803120_16F63AB9 X-CRM114-Status: GOOD ( 14.67 ) 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 Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote: > 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. yes, I have bpf kprobe-multi link support for that [0] (it's on top of Masami's fprobe-over-fgraph changes) we discussed that in [1] jirka [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/ _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel