android/android_kernel_asus_sm8350
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ANDROID: kbuild: limit LTO inlining

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This change limits function inlining across translation unit
boundaries in order to reduce the binary size with LTO.

The -import-instr-limit flag defines a size limit, as the number
of LLVM IR instructions, for importing functions from other TUs.
The default value is 100, and decreasing it to 5 reduces the size
of a stripped arm64 defconfig vmlinux by 11%.

Bug: 145297228
Change-Id: Iaf366f843582972a5dfadc4695abb8f9c59882af
Suggested-by: George Burgess IV <gbiv@google.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Sami Tolvanen 2019-12-04 15:57:39 -08:00 committed by Alistair Delva
parent a33d4b39de
commit 1a387ad21d
1 changed files with 6 additions and 0 deletions
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6
Makefile
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@ -875,6 +875,12 @@ CC_FLAGS_LTO_CLANG := -flto
endif
CC_FLAGS_LTO_CLANG += -fvisibility=default
# Limit inlining across translation units to reduce binary size
LD_FLAGS_LTO_CLANG := -mllvm -import-instr-limit=5
KBUILD_LDFLAGS += $(LD_FLAGS_LTO_CLANG)
KBUILD_LDFLAGS_MODULE += $(LD_FLAGS_LTO_CLANG)
KBUILD_LDS_MODULE += $(srctree)/scripts/module-lto.lds
endif