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| author | Fangrui Song <maskray@google.com> | 2019-08-21 03:02:08 +0000 |
|---|---|---|
| committer | Fangrui Song <maskray@google.com> | 2019-08-21 03:02:08 +0000 |
| commit | 35f9a84a15d15d70e8aa35cc5a750309f49ea640 (patch) | |
| tree | f31142866ce1e2409bdeb74c188c9ea94f369f97 /lldb/packages/Python/lldbsuite/test/source-manager/TestSourceManager.py | |
| parent | f938755a331206f017eaa5e8ab6a122b162e8de3 (diff) | |
| download | bcm5719-llvm-35f9a84a15d15d70e8aa35cc5a750309f49ea640.tar.gz bcm5719-llvm-35f9a84a15d15d70e8aa35cc5a750309f49ea640.zip | |
[ELF] More dynamic relocation packing
Currently, with Android dynamic relocation packing, only relative
relocations are grouped together. This patch implements similar
packing for non-relative relocations.
The implementation groups non-relative relocations with the same
r_info and r_addend, if using RELA. By requiring a minimum group
size of 3, this achieves smaller relocation sections. Building Android
for an ARM32 device, I see the total size of /system/lib decrease by
392 KB.
Grouping by r_info also allows the runtime dynamic linker to implement
an 1-entry cache to reduce the number of symbol lookup required. With
such 1-entry cache implemented on Android, I'm seeing 10% to 20%
reduction in total time spent in runtime linker for several executables
that I tested.
As a simple correctness check, I've also built x86_64 Android and booted
successfully.
Differential Revision: https://reviews.llvm.org/D66491
Patch by Vic Yang!
llvm-svn: 369488
Diffstat (limited to 'lldb/packages/Python/lldbsuite/test/source-manager/TestSourceManager.py')
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