Buildresult: kbuild/x86_64-defconfig/x86_64-gcc8 built on Nov 7, 02:27

kisskb

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Status:	OK
Date/Time:	Nov 7, 02:27
Duration:	0:01:34.286521
Builder:	ka4
Revision:	kbuild: Add Propeller configuration for kernel build (`0dcc2d1066150787017a71f035145c566597dec7)`
Target:	kbuild/x86_64-defconfig/x86_64-gcc8
Branch:	kbuild
Compiler:	x86_64-gcc8 (x86_64-linux-gcc (GCC) 8.5.0 / GNU ld (GNU Binutils) 2.36.1)
Config:	defconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify 0dcc2d1066150787017a71f035145c566597dec7^{commit} 0dcc2d1066150787017a71f035145c566597dec7 already have revision, skipping fetch # git checkout -q -f -B kisskb 0dcc2d1066150787017a71f035145c566597dec7 # git clean -qxdf # < git log -1 # commit 0dcc2d1066150787017a71f035145c566597dec7 # Author: Rong Xu <xur@google.com> # Date: Sat Nov 2 10:51:14 2024 -0700 # # kbuild: Add Propeller configuration for kernel build # # Add the build support for using Clang's Propeller optimizer. Like # AutoFDO, Propeller uses hardware sampling to gather information # about the frequency of execution of different code paths within a # binary. This information is then used to guide the compiler's # optimization decisions, resulting in a more efficient binary. # # The support requires a Clang compiler LLVM 19 or later, and the # create_llvm_prof tool # (https://github.com/google/autofdo/releases/tag/v0.30.1). This # commit is limited to x86 platforms that support PMU features # like LBR on Intel machines and AMD Zen3 BRS. # # Here is an example workflow for building an AutoFDO+Propeller # optimized kernel: # # 1) Build the kernel on the host machine, with AutoFDO and Propeller # build config # CONFIG_AUTOFDO_CLANG=y # CONFIG_PROPELLER_CLANG=y # then # $ make LLVM=1 CLANG_AUTOFDO_PROFILE=<autofdo_profile> # # “<autofdo_profile>” is the profile collected when doing a non-Propeller # AutoFDO build. This step builds a kernel that has the same optimization # level as AutoFDO, plus a metadata section that records basic block # information. This kernel image runs as fast as an AutoFDO optimized # kernel. # # 2) Install the kernel on test/production machines. # # 3) Run the load tests. The '-c' option in perf specifies the sample # event period. We suggest using a suitable prime number, # like 500009, for this purpose. # For Intel platforms: # $ perf record -e BR_INST_RETIRED.NEAR_TAKEN:k -a -N -b -c <count> \ # -o <perf_file> -- <loadtest> # For AMD platforms: # The supported system are: Zen3 with BRS, or Zen4 with amd_lbr_v2 # # To see if Zen3 support LBR: # $ cat proc/cpuinfo \| grep " brs" # # To see if Zen4 support LBR: # $ cat proc/cpuinfo \| grep amd_lbr_v2 # # If the result is yes, then collect the profile using: # $ perf record --pfm-events RETIRED_TAKEN_BRANCH_INSTRUCTIONS:k -a \ # -N -b -c <count> -o <perf_file> -- <loadtest> # # 4) (Optional) Download the raw perf file to the host machine. # # 5) Generate Propeller profile: # $ create_llvm_prof --binary=<vmlinux> --profile=<perf_file> \ # --format=propeller --propeller_output_module_name \ # --out=<propeller_profile_prefix>_cc_profile.txt \ # --propeller_symorder=<propeller_profile_prefix>_ld_profile.txt # # “create_llvm_prof” is the profile conversion tool, and a prebuilt # binary for linux can be found on # https://github.com/google/autofdo/releases/tag/v0.30.1 (can also build # from source). # # "<propeller_profile_prefix>" can be something like # "/home/user/dir/any_string". # # This command generates a pair of Propeller profiles: # "<propeller_profile_prefix>_cc_profile.txt" and # "<propeller_profile_prefix>_ld_profile.txt". # # 6) Rebuild the kernel using the AutoFDO and Propeller profile files. # CONFIG_AUTOFDO_CLANG=y # CONFIG_PROPELLER_CLANG=y # and # $ make LLVM=1 CLANG_AUTOFDO_PROFILE=<autofdo_profile> \ # CLANG_PROPELLER_PROFILE_PREFIX=<propeller_profile_prefix> # # Co-developed-by: Han Shen <shenhan@google.com> # Signed-off-by: Han Shen <shenhan@google.com> # Signed-off-by: Rong Xu <xur@google.com> # Suggested-by: Sriraman Tallam <tmsriram@google.com> # Suggested-by: Krzysztof Pszeniczny <kpszeniczny@google.com> # Suggested-by: Nick Desaulniers <ndesaulniers@google.com> # Suggested-by: Stephane Eranian <eranian@google.com> # Tested-by: Yonghong Song <yonghong.song@linux.dev> # Tested-by: Nathan Chancellor <nathan@kernel.org> # Reviewed-by: Kees Cook <kees@kernel.org> # Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> # < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version # < git log --format=%s --max-count=1 0dcc2d1066150787017a71f035145c566597dec7 # make -s -j 40 ARCH=x86_64 O=/kisskb/build/kbuild_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux- defconfig # < make -s -j 40 ARCH=x86_64 O=/kisskb/build/kbuild_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux- help # make -s -j 40 ARCH=x86_64 O=/kisskb/build/kbuild_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux- olddefconfig # make -s -j 40 ARCH=x86_64 O=/kisskb/build/kbuild_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux- Completed OK # rm -rf /kisskb/build/kbuild_defconfig_x86_64-gcc8 # Build took: 0:01:34.286521

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