From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 D9B0526C38C for ; Tue, 3 Mar 2026 09:31:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772530311; cv=none; b=TP0W/1T8F1/xYizGqkA/P9WxUkJjZUY72K5LfnMOzrx3x9yWXA7cPlk3k9+KZ9e/U6r8uaTzVhDZcZXiAIF5yahJ5veN3zvM5ykhkQxAxozslXAsFjtYakI6Z6Nk+1T1wuLhTdcEKBUe8iyPqV7/kAIv0gFuLFVlpIdU/RLBY2U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772530311; c=relaxed/simple; bh=5k595noegC1Xk9Vu+ecz4v6twATEWBxFXL1BMtuodzc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=XfaYqUGYoGe0K1e6XBlLxAJvi7IIIOk5ymKOUvAWe5nKqQbWCstEZ6cYt4qJBbkLrY3EyJVCdW1jfdAESh39K0ZKEUHXXbXE5QERm0qJk6/7hgnxhAcwkAI8G7uQUBkUFcXEBIXiDsnyAxD0aDkAY/EhxVEtlG6ZPb4neGM+ydI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=efB+eAi2; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="efB+eAi2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4E22DC116C6; Tue, 3 Mar 2026 09:31:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772530311; bh=5k595noegC1Xk9Vu+ecz4v6twATEWBxFXL1BMtuodzc=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=efB+eAi2IhPQumEo7ep4YVjMOnd4zHVKdcChA9Jgm43ii7VFm80DXzPDIFXchHN1m 0dk2GhKKDm1U5TpaxK5JMDZ25V+2fuYfoEdEX9oJqM0dOqVN9XQVuMvJ9++qqPD5Um G9YF4gVkPp3CN0qIa7RPBlZRh9JrZKQfJ7n37vuHuBQyEcgmAOhcNV0Kc/X7nzQ8B0 J10WYKNqBsOjkpxpb1+7xv6KMPKt9EhIIkgSPNahiT3LqjTXkgpUnATi637KTORbuK i0xhXlobYhSNXHRgS5ytgsgK6Vyjv+qTNQb0jB0zVKuAc1G75zAXSexUkNwwwMuDKV 53ha73ZiErsDQ== Message-ID: <10bef54e-eb0c-4ed3-84ca-4e393449e974@kernel.org> Date: Tue, 3 Mar 2026 10:31:46 +0100 Precedence: bulk X-Mailing-List: ksummit@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC] kallsyms: embed source file:line info in kernel stack traces To: Geert Uytterhoeven , Richard Weinberger Cc: Sasha Levin , Linus Torvalds , Andrew Morton , Konstantin Ryabitsev , ksummit , laurent pinchart , Thorsten Leemhuis , Steven Rostedt , users References: <20260302202828.2722037-1-sashal@kernel.org> <91334269.1714.1772519173246.JavaMail.zimbra@nod.at> Content-Language: en-US From: Jiri Slaby Autocrypt: addr=jirislaby@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 03. 03. 26, 9:11, Geert Uytterhoeven wrote: > On Tue, 3 Mar 2026 at 07:26, Richard Weinberger wrote: >>> Von: "Sasha Levin" >>> Add CONFIG_KALLSYMS_LINEINFO, which embeds a compact address-to-line >>> lookup table in the kernel image so stack traces directly print source >>> file and line number information: > >>> Memory footprint measured with a simple KVM guest x86_64 config: >>> >>> Table: 4,597,583 entries from 4,841 source files >>> lineinfo_addrs[] 4,597,583 x u32 = 17.5 MiB >>> lineinfo_file_ids[] 4,597,583 x u16 = 8.8 MiB >>> lineinfo_lines[] 4,597,583 x u32 = 17.5 MiB >>> file_offsets + filenames ~ 0.1 MiB >>> Total .rodata increase: ~ 44.0 MiB >>> >>> vmlinux (stripped): 529 MiB -> 573 MiB (+44 MiB / +8.3%) >> >> Hm, that's a significant increase. > > Other random idea: this data is only needed in case of a crash. > Perhaps it can be stored compressed, and only be decompressed > when needed, or even during look-up? But obviously not when dumping OOM stack traces :P. -- js suse labs