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| author | Rong Xu <xur@google.com> | 2024-11-02 18:51:12 +0100 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2024-11-27 01:38:27 +0100 |
| commit | 0847420f5e499a7ab518942fff71482179290163 (patch) | |
| tree | 7791975ce8a55628bc44679348372420ced62f12 /scripts/Makefile.autofdo | |
| parent | vmlinux.lds.h: Add markers for text_unlikely and text_hot sections (diff) | |
| download | linux-0847420f5e499a7ab518942fff71482179290163.tar.xz linux-0847420f5e499a7ab518942fff71482179290163.zip | |
AutoFDO: Enable -ffunction-sections for the AutoFDO build
Enable -ffunction-sections by default for the AutoFDO build.
With -ffunction-sections, the compiler places each function in its own
section named .text.function_name instead of placing all functions in
the .text section. In the AutoFDO build, this allows the linker to
utilize profile information to reorganize functions for improved
utilization of iCache and iTLB.
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>
Tested-by: Yonghong Song <yonghong.song@linux.dev>
Tested-by: Yabin Cui <yabinc@google.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Kees Cook <kees@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'scripts/Makefile.autofdo')
| -rw-r--r-- | scripts/Makefile.autofdo | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/Makefile.autofdo b/scripts/Makefile.autofdo index ff96a63fea7c..6155d6fc4ca7 100644 --- a/scripts/Makefile.autofdo +++ b/scripts/Makefile.autofdo @@ -9,7 +9,7 @@ ifndef CONFIG_DEBUG_INFO endif ifdef CLANG_AUTOFDO_PROFILE - CFLAGS_AUTOFDO_CLANG += -fprofile-sample-use=$(CLANG_AUTOFDO_PROFILE) + CFLAGS_AUTOFDO_CLANG += -fprofile-sample-use=$(CLANG_AUTOFDO_PROFILE) -ffunction-sections endif ifdef CONFIG_LTO_CLANG_THIN |