Public bug reported:
On binaries with a lot of symbols a massive performance degradation has
happened between 14.04 and 14.10
I have bisected the gdb performance degradation to this gdb commit
commit 5840bf271c87c3fc14739173fdc91c6a14057130 (refs/bisect/bad)
Author: H.J. Lu <hjl.to...@gmail.com>
Date: Wed Jul 16 17:16:24 2014
Properly match PLT entry against .got.plt relocation
Relocations against .got.plt section may not be in the same order as
entries in PLT section. It is incorrect to assume that the Ith reloction
index against .got.plt section always maps to the (I + 1)th entry in PLT
section. This patch matches the .got.plt relocation offset/index in PLT
entry against the index in .got.plt relocation table. It only checks
R_*_JUMP_SLOT and R_*_IRELATIVE relocations. It ignores R_*_TLS_DESC
and R_*_TLSDESC relocations since they have different PLT entries.
bfd/
PR binutils/17154
* elf32-i386.c (elf_i386_plt_sym_val): Only match R_*_JUMP_SLOT
and R_*_IRELATIVE relocation offset with PLT entry.
* elf64-x86-64.c (elf_x86_64_plt_sym_val): Likewise.
(elf_x86_64_plt_sym_val_offset_plt_bnd): New.
(elf_x86_64_get_synthetic_symtab): Use it.
ld/testsuite/
PR binutils/17154
* ld-ifunc/pr17154-i386.d: New file.
* ld-ifunc/pr17154-x86-64.d: Likewise.
* ld-ifunc/pr17154-x86.s: Likewise.
* ld-x86-64/bnd-ifunc-2.d: Likewise.
* ld-x86-64/bnd-ifunc-2.s: Likewise.
* ld-x86-64/mpx.exp: Run bnd-ifunc-2.
* ld-x86-64/tlsdesc-nacl.pd: Updated.
* ld-x86-64/tlsdesc.pd: Likewise.
ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: gdb 7.8-1ubuntu4
ProcVersionSignature: Ubuntu 3.16.0-24.32-lowlatency 3.16.4
Uname: Linux 3.16.0-24-lowlatency x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Nov 3 23:27:53 2014
InstallationDate: Installed on 2014-07-11 (115 days ago)
InstallationMedia: Kubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140710)
SourcePackage: gdb
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gdb (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug utopic
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https://bugs.launchpad.net/bugs/1388999
Title:
gdb is realy slow starting debugging.
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