On Thu, Apr 8, 2021 at 9:04 PM Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote: > > Hi, > > I tried this patch together with my build-script which uses builddeb > to generate Debian packages. > > Currently, I test a setup with Clang-LTO + DWARF-v5 (and BTF). > > With this patch I get total strange numbers. > > The Kconfig changes to my previous kernel of today: > > $ scripts/diffconfig /boot/config-5.12.0-rc6-3-amd64-clang12-lto > /boot/config-5.12.0-rc6-4-amd64-clang12-lto > BUILD_SALT "5.12.0-rc6-3-amd64-clang12-lto" -> "5.12.0-rc6-4-amd64-clang12-lto" > MODULE_COMPRESS_NONE y -> n > MODULE_COMPRESS_ZSTD n -> y > > The generated linux-image Debian package is greater in size than the > linux-image DEBUG package. > Normally, this is vice-versa. > > With: > > $ du -s -m linux-image-5.12.0-rc6-4-amd64-clang12-lto* > 969 linux-image-5.12.0-rc6-4-amd64-clang12-lto_5.12.0~rc6-4~bullseye+dileks1_amd64.deb > 97 linux-image-5.12.0-rc6-4-amd64-clang12-lto-dbg_5.12.0~rc6-4~bullseye+dileks1_amd64.deb > (DEBUG) > > Without: > > $ du -s -m linux-image-5.12.0-rc6-3-amd64-clang12-lto* > 60 linux-image-5.12.0-rc6-3-amd64-clang12-lto_5.12.0~rc6-3~bullseye+dileks1_amd64.deb > 599 linux-image-5.12.0-rc6-3-amd64-clang12-lto-dbg_5.12.0~rc6-3~bullseye+dileks1_amd64.deb > (DEBUG) > > The kernel-modules directory numbers: > > With: > > # du -s -m /lib/modules/5.12.0-rc6-4-amd64-clang12-lto/ > 999 /lib/modules/5.12.0-rc6-4-amd64-clang12-lto/ > > Without: > > # du -s -m /lib/modules/5.12.0-rc6-3-amd64-clang12-lto/ > 354 /lib/modules/5.12.0-rc6-3-amd64-clang12-lto/ > > Checking iwlwifi kernel-module: > > With: > > # find /lib/modules/5.12.0-rc6-4-amd64-clang12-lto/ -name > 'iwlwifi.ko*' -type f -print | xargs ls -l > -rw-r--r-- 1 root root 2381066 8. Apr 15:47 > /lib/modules/5.12.0-rc6-4-amd64-clang12-lto/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko.zst > > # find /lib/modules/5.12.0-rc6-4-amd64-clang12-lto/ -name > 'iwlwifi.ko*' -type f -print | xargs du -k > 2328 /lib/modules/5.12.0-rc6-4-amd64-clang12-lto/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko.zst > > Without: > > # find /lib/modules/5.12.0-rc6-3-amd64-clang12-lto/ -name > 'iwlwifi.ko*' -type f -print | xargs ls -l > -rw-r--r-- 1 root root 675976 8. Apr 09:35 > /lib/modules/5.12.0-rc6-3-amd64-clang12-lto/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko > > # find /lib/modules/5.12.0-rc6-3-amd64-clang12-lto/ -name > 'iwlwifi.ko*' -type f -print | xargs du -k > 664 /lib/modules/5.12.0-rc6-3-amd64-clang12-lto/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko > > My make invocation looks like this > (start-build_5.12.0-rc6-4-amd64-clang12-lto.txt with this patch): > > dileks 74706 74681 0 15:46 pts/1 00:00:00 /usr/bin/perf_5.10 > stat make V=1 -j4 LLVM=1 LLVM_IAS=1 PAHOLE=/opt/pahole/bin/pahole > LOCALVERSION=-4-amd64-clang12-lto KBUILD_BUILD_HOST=iniza > KBUILD_BUILD_USER=sedat.dilek@xxxxxxxxx > KBUILD_BUILD_TIMESTAMP=2021-04-08 bindeb-pkg > KDEB_PKGVERSION=5.12.0~rc6-4~bullseye+dileks1 > > Finally: > > I can *NOT* boot into the kernel with this patch applied. > > Personally, I do disable intentionally: > > CONFIG_DEBUG_INFO_COMPRESSED=n > > ...and will do independent of this patch: > > CONFIG_MODULE_COMPRESS_NONE=n > > As all Debian packages - generated by builddeb - are by default > compressed with XZ. > Compressing stuff before is counterproductive. > This strategy generates in total smaller Debian package binaries. > > This is my first analysis, I had no deeper look. > > If you need further information, please let me know. > > Please take a look at this. > > Both linux-configs attached. > > Thanks. > Additional information: $ LC_ALL=C ll drivers/net/wireless/intel/iwlwifi/iwlwifi.ko -rw-r--r-- 1 dileks dileks 8.2M Apr 8 19:22 drivers/net/wireless/intel/iwlwifi/iwlwifi.ko $ file drivers/net/wireless/intel/iwlwifi/iwlwifi.ko drivers/net/wireless/intel/iwlwifi/iwlwifi.ko: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), BuildID[sha1]=bfb188058d16a7cb7d579f68edcd1fff2a4d45d7, with debug_info, not stripped $ LC_ALL=C ll debian/linux-image/lib/modules/5.12.0-rc6-4-amd64-clang12-lto/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko.zst -rw-r--r-- 1 dileks dileks 2.3M Apr 8 19:29 debian/linux-image/lib/modules/5.12.0-rc6-4-amd64-clang12-lto/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko.zst Looks like the kernel-module with debug_info gets ZTSD compressed. - Sedat
