From nobody Tue Apr 7 23:48:27 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D895EC4332F for ; Thu, 10 Nov 2022 20:00:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230392AbiKJUAk (ORCPT ); Thu, 10 Nov 2022 15:00:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229559AbiKJUAh (ORCPT ); Thu, 10 Nov 2022 15:00:37 -0500 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EB6F11DDE3 for ; Thu, 10 Nov 2022 12:00:35 -0800 (PST) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-36b1a68bfa6so25312957b3.22 for ; Thu, 10 Nov 2022 12:00:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=VIHNRdmfkBzhmHybI0x1Prd4hOkiCS+S8r79WveHpBo=; b=cu4FgUi89nxSfbZYxNMsDps7Ulsc39wNIRiDjhIKxXG80QX1OL9tfuJPG63usxMrfZ EW0EhYGrzNcvEDeg2LJwpIMVIEsDsbkhn78rH9inwUS2fi3OUzn6YBpR5JzoNX6d5akX yqZCNCDPjsURHtfN5tzUr2oSAmpKUAFfossYVIzMMav+l/GeZKi76Cb8lVJD6ulhALkn 4ZEL0WiaB82yxJCGdS78iyKyD/dTmcRRuVN3b2tisbYjQF4Ebuee6VzRaHXhrGmUseAM WxD3VAndP/oMYJHCM61Aw0DedqJxA7H47RNOKvSX93tfo+usF2majhxcgW8/rpkNYS+a gtew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=VIHNRdmfkBzhmHybI0x1Prd4hOkiCS+S8r79WveHpBo=; b=XzXQ37vqT1+i/TLL4F2z2AsPOc+HbTPgwglWO78ktACzmhGeNT1itXlgAPqb0FnPcm KB1KigEEnBaU08NrkhZ/ImVDLmz+tBypFIImXbe0zMIiTpqN1NmyxscJioSjSTbePzvZ ATOKCTybVKRmfeswiyntSdICjhRCFmMDa9OYDTtoopPt47EkEU13V6mwdr9QrFBu9g89 cFi1Du8j2Z1vTAzXz4yTa0W41fml2TinSRsY/KrjQ6tpcaIZ0x2/e+X8/ZcuRS1hTAQw FPr/iSLZb6oYFXEvW/7s0gG7HMnCzxogmc0fkJr+R+dQ/J2ICQDsvfLpmBGCHPobUAC4 jQZg== X-Gm-Message-State: ANoB5pmi417vJP2fGCCbFKoJYfcnDqmiV+/I04TQbmiM/G+JCHunatlI GPszzXYpMU/rNxAC+7hGSEdc5VUU1RSUQZAM3qM= X-Google-Smtp-Source: AA0mqf4Nns+WLB4chAB/kEa+/ldX4+HthE59/h8FIr8lboM5FzK8xxaLgMNVvf52/T7Ej8fhOWa1WRKalLbmf188S8Q= X-Received: from ndesaulniers-desktop.svl.corp.google.com ([2620:15c:2d1:203:a5cc:f0f5:1fc6:713]) (user=ndesaulniers job=sendgmr) by 2002:a05:6902:154d:b0:6dc:5d5a:26a4 with SMTP id r13-20020a056902154d00b006dc5d5a26a4mr5480669ybu.286.1668110395128; Thu, 10 Nov 2022 11:59:55 -0800 (PST) Date: Thu, 10 Nov 2022 11:59:05 -0800 In-Reply-To: Mime-Version: 1.0 References: X-Developer-Key: i=ndesaulniers@google.com; a=ed25519; pk=UIrHvErwpgNbhCkRZAYSX0CFd/XFEwqX3D0xqtqjNug= X-Developer-Signature: v=1; a=ed25519-sha256; t=1668110345; l=4874; i=ndesaulniers@google.com; s=20220923; h=from:subject; bh=5du/c21UJsTP9Yrc1x6+H5At2NkImsL0yE/dV2D9Aqg=; b=jLKlgldZtH5445CKtJeiIIGHnUJ3Z4tI5G9+yYiQLjJ+BdGcCieQnNZdfViY/CuZT+HHt3oI8367 yREqodIHD14KXhNcsVBB4b6lhbRZUHDyA/h8pnghqSzqf4T1ULA7 X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog Message-ID: <20221110195932.377841-1-ndesaulniers@google.com> Subject: [PATCH v3] Makefile.debug: support for -gz=zstd From: Nick Desaulniers To: Masahiro Yamada Cc: Fangrui Song , Nick Desaulniers , Sedat Dilek , Nathan Chancellor , Michal Marek , Nick Terrell , Tom Rix , Andrew Morton , "Peter Zijlstra (Intel)" , David Gow , Kees Cook , Josh Poimboeuf , Dan Williams , Miguel Ojeda , Isabella Basso , Vlastimil Babka , Rasmus Villemoes , linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, llvm@lists.linux.dev Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Make DEBUG_INFO_COMPRESSED a choice; DEBUG_INFO_COMPRESSED_NONE is the default, DEBUG_INFO_COMPRESSED_ZLIB uses zlib, DEBUG_INFO_COMPRESSED_ZSTD uses zstd. This renames the existing KConfig option DEBUG_INFO_COMPRESSED to DEBUG_INFO_COMPRESSED_ZLIB so users upgrading may need to reset the new Kconfigs. Some quick N=3D1 measurements with du, /usr/bin/time -v, and bloaty: clang-16, x86_64 defconfig plus CONFIG_DEBUG_INFO=3Dy CONFIG_DEBUG_INFO_COMPRESSED_NONE=3Dy: Elapsed (wall clock) time (h:mm:ss or m:ss): 0:55.43 488M vmlinux 27.6% 136Mi 0.0% 0 .debug_info 6.1% 30.2Mi 0.0% 0 .debug_str_offsets 3.5% 17.2Mi 0.0% 0 .debug_line 3.3% 16.3Mi 0.0% 0 .debug_loclists 0.9% 4.62Mi 0.0% 0 .debug_str clang-16, x86_64 defconfig plus CONFIG_DEBUG_INFO=3Dy CONFIG_DEBUG_INFO_COMPRESSED_ZLIB=3Dy: Elapsed (wall clock) time (h:mm:ss or m:ss): 1:00.35 385M vmlinux 21.8% 85.4Mi 0.0% 0 .debug_info 2.1% 8.26Mi 0.0% 0 .debug_str_offsets 2.1% 8.24Mi 0.0% 0 .debug_loclists 1.9% 7.48Mi 0.0% 0 .debug_line 0.5% 1.94Mi 0.0% 0 .debug_str clang-16, x86_64 defconfig plus CONFIG_DEBUG_INFO=3Dy CONFIG_DEBUG_INFO_COMPRESSED_ZSTD=3Dy: Elapsed (wall clock) time (h:mm:ss or m:ss): 0:59.69 373M vmlinux 21.4% 81.4Mi 0.0% 0 .debug_info 2.3% 8.85Mi 0.0% 0 .debug_loclists 1.5% 5.71Mi 0.0% 0 .debug_line 0.5% 1.95Mi 0.0% 0 .debug_str_offsets 0.4% 1.62Mi 0.0% 0 .debug_str That's only a 3.11% overall binary size savings over zlib, but at no performance regression. Link: https://maskray.me/blog/2022-09-09-zstd-compressed-debug-sections Link: https://maskray.me/blog/2022-01-23-compressed-debug-sections Suggested-by: Sedat Dilek (DHL Supply Chain) Reviewed-by: Nathan Chancellor Signed-off-by: Nick Desaulniers --- Changes v2 -> v3: * Fix scripts/Makefile.debug as per Sedat. * Update commit message as per Nicolas. Changes v1 -> v2: * Remove `depends on DEBUG_KERNEL` as per Nathan. * Rename Kconfigs as per Sedat and Masahiro. * Add note about renamed Kconfigs to commit message. * Add more help text to DEBUG_INFO_COMPRESSED_ZSTD. lib/Kconfig.debug | 29 +++++++++++++++++++++++++++-- scripts/Makefile.debug | 6 +++++- 2 files changed, 32 insertions(+), 3 deletions(-) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 29280072dc0e..7c28a8fba02e 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -312,8 +312,21 @@ config DEBUG_INFO_REDUCED DEBUG_INFO build and compile times are reduced too. Only works with newer gcc versions. =20 -config DEBUG_INFO_COMPRESSED - bool "Compressed debugging information" +choice + prompt "Compressed Debug information" + help + Compress the resulting debug info. Results in smaller debug info sectio= ns, + but requires that consumers are able to decompress the results. + + If unsure, choose DEBUG_INFO_COMPRESSED_NONE. + +config DEBUG_INFO_COMPRESSED_NONE + bool "Don't compress debug information" + help + Don't compress debug info sections. + +config DEBUG_INFO_COMPRESSED_ZLIB + bool "Compress debugging information with zlib" depends on $(cc-option,-gz=3Dzlib) depends on $(ld-option,--compress-debug-sections=3Dzlib) help @@ -327,6 +340,18 @@ config DEBUG_INFO_COMPRESSED preferable to setting $KDEB_COMPRESS to "none" which would be even larger. =20 +config DEBUG_INFO_COMPRESSED_ZSTD + bool "Compress debugging information with zstd" + depends on $(cc-option,-gz=3Dzstd) + depends on $(ld-option,--compress-debug-sections=3Dzstd) + help + Compress the debug information using zstd. This may provide better + compression than zlib, for about the same time costs, but requires newer + toolchain support. Requires GCC 13.0+ or Clang 16.0+, binutils 2.40+, = and + zstd. + +endchoice # "Compressed Debug information" + config DEBUG_INFO_SPLIT bool "Produce split debuginfo in .dwo files" depends on $(cc-option,-gsplit-dwarf) diff --git a/scripts/Makefile.debug b/scripts/Makefile.debug index 332c486f705f..059ff38fe0cb 100644 --- a/scripts/Makefile.debug +++ b/scripts/Makefile.debug @@ -27,10 +27,14 @@ else DEBUG_RUSTFLAGS +=3D -Cdebuginfo=3D2 endif =20 -ifdef CONFIG_DEBUG_INFO_COMPRESSED +ifdef CONFIG_DEBUG_INFO_COMPRESSED_ZLIB DEBUG_CFLAGS +=3D -gz=3Dzlib KBUILD_AFLAGS +=3D -gz=3Dzlib KBUILD_LDFLAGS +=3D --compress-debug-sections=3Dzlib +else ifdef CONFIG_DEBUG_INFO_COMPRESSED_ZSTD +DEBUG_CFLAGS +=3D -gz=3Dzstd +KBUILD_AFLAGS +=3D -gz=3Dzstd +KBUILD_LDFLAGS +=3D --compress-debug-sections=3Dzstd endif =20 KBUILD_CFLAGS +=3D $(DEBUG_CFLAGS) base-commit: 1767a722a708f1fa3b9af39eb091d79101f8c086 --=20 2.38.1.431.g37b22c650d-goog