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c9cd7b0ce5
On POWER8, unaligned memory accesses to cached memory has little impact
on performance as opposed to its ancestors.
It is disabled by default and will only be available when the tunable
glibc.tune.cached_memopt is set to 1.
__memcpy_power8_cached __memcpy_power7
============================================================
max-size=4096: 33325.70 ( 12.65%) 38153.00
max-size=8192: 32878.20 ( 11.17%) 37012.30
max-size=16384: 33782.20 ( 11.61%) 38219.20
max-size=32768: 33296.20 ( 11.30%) 37538.30
max-size=65536: 33765.60 ( 10.53%) 37738.40
* manual/tunables.texi (Hardware Capability Tunables): Document
glibc.tune.cached_memopt.
* sysdeps/powerpc/cpu-features.c: New file.
* sysdeps/powerpc/cpu-features.h: New file.
* sysdeps/powerpc/dl-procinfo.c [!IS_IN(ldconfig)]: Add
_dl_powerpc_cpu_features.
* sysdeps/powerpc/dl-tunables.list: New file.
* sysdeps/powerpc/ldsodefs.h: Include cpu-features.h.
* sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h
(INIT_ARCH): Initialize use_aligned_memopt.
* sysdeps/powerpc/powerpc64/dl-machine.h [defined(SHARED &&
IS_IN(rtld))]: Restrict dl_platform_init availability and
initialize CPU features used by tunables.
* sysdeps/powerpc/powerpc64/multiarch/Makefile (sysdep_routines):
Add memcpy-power8-cached.
* sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c: Add
__memcpy_power8_cached.
* sysdeps/powerpc/powerpc64/multiarch/memcpy.c: Likewise.
* sysdeps/powerpc/powerpc64/multiarch/memcpy-power8-cached.S:
New file.
Reviewed-by: Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>
70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/* Run-time dynamic linker data structures for loaded ELF shared objects.
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Copyright (C) 1995-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _POWERPC_LDSODEFS_H
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#define _POWERPC_LDSODEFS_H 1
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#include <elf.h>
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#include <cpu-features.h>
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struct La_ppc32_regs;
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struct La_ppc32_retval;
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struct La_ppc64_regs;
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struct La_ppc64_retval;
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struct La_ppc64v2_regs;
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struct La_ppc64v2_retval;
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#define ARCH_PLTENTER_MEMBERS \
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Elf32_Addr (*ppc32_gnu_pltenter) (Elf32_Sym *, unsigned int, uintptr_t *, \
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uintptr_t *, struct La_ppc32_regs *, \
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unsigned int *, const char *name, \
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long int *framesizep); \
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Elf64_Addr (*ppc64_gnu_pltenter) (Elf64_Sym *, unsigned int, uintptr_t *, \
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uintptr_t *, struct La_ppc64_regs *, \
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unsigned int *, const char *name, \
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long int *framesizep); \
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Elf64_Addr (*ppc64v2_gnu_pltenter) (Elf64_Sym *, unsigned int, \
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uintptr_t *, uintptr_t *, \
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struct La_ppc64v2_regs *, \
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unsigned int *, const char *name, \
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long int *framesizep)
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#define ARCH_PLTEXIT_MEMBERS \
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unsigned int (*ppc32_gnu_pltexit) (Elf32_Sym *, unsigned int, \
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uintptr_t *, \
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uintptr_t *, \
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const struct La_ppc32_regs *, \
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struct La_ppc32_retval *, \
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const char *); \
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unsigned int (*ppc64_gnu_pltexit) (Elf64_Sym *, unsigned int, \
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uintptr_t *, \
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uintptr_t *, \
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const struct La_ppc64_regs *, \
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struct La_ppc64_retval *, \
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const char *); \
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unsigned int (*ppc64v2_gnu_pltexit) (Elf64_Sym *, unsigned int, \
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uintptr_t *, \
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uintptr_t *, \
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const struct La_ppc64v2_regs *,\
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struct La_ppc64v2_retval *, \
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const char *)
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#include_next <ldsodefs.h>
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#endif
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