diff options
| author | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2017-12-11 17:39:42 -0200 |
|---|---|---|
| committer | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2017-12-11 17:39:42 -0200 |
| commit | c9cd7b0ce5c52a3dac7347084651d7df0b39a6d0 (patch) | |
| tree | 725d9e24e8a3c66866e2b8963928d4857f09b561 /sysdeps/powerpc/dl-procinfo.c | |
| parent | e70c6fee466d26af36a38270e451cbe3273a6660 (diff) | |
| download | glibc-c9cd7b0ce5c52a3dac7347084651d7df0b39a6d0.tar.gz glibc-c9cd7b0ce5c52a3dac7347084651d7df0b39a6d0.tar.xz glibc-c9cd7b0ce5c52a3dac7347084651d7df0b39a6d0.zip | |
powerpc: POWER8 memcpy optimization for cached memory
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>
Diffstat (limited to 'sysdeps/powerpc/dl-procinfo.c')
| -rw-r--r-- | sysdeps/powerpc/dl-procinfo.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/sysdeps/powerpc/dl-procinfo.c b/sysdeps/powerpc/dl-procinfo.c index 55a6e78aa8..c8b14454dc 100644 --- a/sysdeps/powerpc/dl-procinfo.c +++ b/sysdeps/powerpc/dl-procinfo.c @@ -42,6 +42,22 @@ # define PROCINFO_CLASS #endif +#if !IS_IN (ldconfig) +# if !defined PROCINFO_DECL && defined SHARED + ._dl_powerpc_cpu_features +# else +PROCINFO_CLASS struct cpu_features _dl_powerpc_cpu_features +# endif +# ifndef PROCINFO_DECL += { } +# endif +# if !defined SHARED || defined PROCINFO_DECL +; +# else +, +# endif +#endif + #if !defined PROCINFO_DECL && defined SHARED ._dl_powerpc_cap_flags #else |