[llvm-dev] Android kernel PGO with LLVM
llvm-dev at lists.llvm.org
Tue Apr 28 21:07:34 PDT 2020
Thank you for replying! I have checked the symbol of libclang_rt.profile-
aarch64-android.a file. This archive library contains InstrProfilingValue.o
as well as the symbol of '__llvm_profile_instrument_target' that i need(see
https://pastebin.com/7LqpFtkP ). So I have tried to add this archive
library as a link-time library when building the Android kernel. But the
error still remains. I think the Android kernel may not be able to call
libraries outside the kernel source tree when linking and running. So I'm
porting pgo-related files (compiler-rt/lib/profile/) from compiler-rt to
Android kernel source tree. Is this the right and feasible way?
From: Xinliang David Li <xinliangli at gmail.com>
Sent: Wednesday, April 29, 2020 1:09 AM
To: Yi Ma <mayi.rjpt at vivo.com>
Cc: llvm-dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Android kernel PGO with LLVM
The entry point is for value profiling and should be defined in InstrProfilingValue.o in the archive library. Can you check the symbol table of the .a file?
On Tue, Apr 28, 2020 at 4:25 AM Yi Ma via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org> > wrote:
I'm working on Android kernel profile-guided optimization to figure out
whether pgo can improve the performance of Android kernel. I have tried
to added '-fprofile-generate' option to build Android kernel(msm-4.19).
But error occurs during building: "undefined reference to
I have tried to add libclang_rt.profile-aarch64-android.a as a library
when building Android kernel, but the error still shows up. I think the
kernel may not be able to call libraries outside the kernel source tree,
so I was porting pgo-related files(compiler-rt/lib/profile/) from
compiler-rt to Android kernel source tree.
Do you know why did this error occurs? And am I doing the right thing?
Is it possible to improve the performance of Android kernel with llvm
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