libunwindstack: Move DwarfOp callback table to rodata section

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There are currently two copies of DwarfOp callback tables in
data.rel.ro section, and that is 16KB of dirty memory per process on a
64-bit platform.

To reduce memory usage, we introduce a layer of indirection so that
all instances of DwarfOp can share a single callback table.  We also
get rid of the pointers for op names in the callback table so that the
entire table can be placed in rodata section.

Test result shows 1MB saving on cuttlefish, and 750KB saving on a Go
device (32-bit ARM).

Bug: 112073665
Test: Boot on cuttlefish and a Go device.
Change-Id: Idf90a513f37534ab1ef30d5742a9d3ea779f3661

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This commit is contained in:

Vic Yang 2019-01-24 11:00:26 -08:00

parent c87d1ed611

commit cc8009ff04

2 changed files with 1450 additions and 1348 deletions

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1452

libunwindstack/DwarfOp.cpp

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1346

libunwindstack/DwarfOp.h

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