From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C9D212737F0 for ; Mon, 4 Aug 2025 14:36:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.13 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754318166; cv=none; b=Qk/AqYiE8aUm/y+rZMlQN2dCJ6DPhRfo+CoACbYCduDF/suWEFldgGlqIZX3KzhkGiSiUAXUBJKfYs+jcbfvBnO0CgzHWcE4o9MM/mPDIWeIabnQx+HEJj3+lPhxrMEIjszr5RTop9t3SPGbpc61Xnv+rQL4vMMpZ99bgk3w0pk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754318166; c=relaxed/simple; bh=GZXdL2SEkkM2QfpLo0F/L59cDUF3meOjI+Jimahboew=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=I9pn1Trs5FnFvLmKaxBISMn6rCwiPtwDLFqO0W2A6XNMqbnmREriWzYAYgcHxHdn2iEZ4zbVILRekfbVoUKj+hZX3e9nPgTSrp0RBaDIHN2QcCIIt0sJVAhxTrJFA9uzB6W8Zk97LyywOUV5TG2032rVV2w78cyMUvJzjiPQBck= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; arc=none smtp.client-ip=216.40.44.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Received: from omf10.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 28293C0625; Mon, 4 Aug 2025 14:35:57 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf10.hostedemail.com (Postfix) with ESMTPA id 323A530; Mon, 4 Aug 2025 14:35:55 +0000 (UTC) Date: Mon, 4 Aug 2025 10:36:22 -0400 From: Steven Rostedt To: Douglas Raillard Cc: linux-trace-devel@vger.kernel.org, Masami Hiramatsu , Namhyung Kim , Takaya Saeki , Ian Rogers , aahringo@redhat.com Subject: Re: [PATCH 0/5] trace-cmd: Use BTF to parse function arguments Message-ID: <20250804103622.3b3762e6@gandalf.local.home> In-Reply-To: <8e75d9d2-8fa2-4232-a00e-2e9bc20d3701@arm.com> References: <20250731202238.1654368-1-rostedt@goodmis.org> <6457bff9-9485-4d2d-82a5-ae436932000a@arm.com> <20250804084543.61c4d6c7@gandalf.local.home> <8e75d9d2-8fa2-4232-a00e-2e9bc20d3701@arm.com> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-trace-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 323A530 X-Stat-Signature: ocdnutcqrodexs4thk86bo5kn5da33cu X-Rspamd-Server: rspamout02 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX18txLKEFiyI427XiVpDF8C+KO1LWFEbBE8= X-HE-Tag: 1754318155-540435 X-HE-Meta: U2FsdGVkX18TGZAXswdgcDxUK7XGwWN12WlRb8Hg1TTiVEYrS/AX8299VGRF2jEIVCxp5FvjUA0gm9Tzbgwn3Mh3iMo6yu0jDFjqRKkK0RLNTSqDJ9fV3zj51KrPSqvS/j0ebm0f/zBCM57uNs6glTl7ixH7ipy0b3kz3bKkZlGCkqa2daJdJcLFkVz61qHEm8fhzD/fqxy4InzzwK3tPC0krBGwWWKlr/GgMIVTC993HVxYM/BSfSV2sQEc6QnQLvMe0FPh98rhVWinrp1kxSCa1XnFdeogz3+31oj95Q+SqaKOJ2PW1uUY5qIirkHWd4U1MhOlVHwpCnftQ/FSpypAIUWLwewLCo3M/bkR86dro7RnKgQU6JQye1q/GuNO2e1CDb0+wbM00KEUK0Q687aoHmYXqLaqPIP+32n39Z5dbRvW2fyWP+hCBfJoBYgE13iGWgU0CMPrknqALq+Ikw== On Mon, 4 Aug 2025 15:28:58 +0100 Douglas Raillard wrote: > Sounds like a good idea. If you want to support passing BTF at report time to supplement a BTF-less trace.dat, > it would make sense to also support getting BTF from the ELF section so that people can pass the real > vmlinux file directly (not the BTF blob in sysfs, the actual ELF vmlinux from Kbuild). > > It seems libbpf allows to do that with bpf_object__open_file(): > https://docs.ebpf.io/ebpf-library/libbpf/userspace/bpf_object__open_file/ > Yeah, but then it adds a dependency that I'm trying to limit. Parsing elf files for sections is quite trivial. I've done that a lot. I may just add a: --btf-elf /path/to/elf-file -- Steve