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| 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/powerpc64/dl-machine.h | |
| parent | e70c6fee466d26af36a38270e451cbe3273a6660 (diff) | |
| download | glibc-c9cd7b0ce5c52a3dac7347084651d7df0b39a6d0.zip glibc-c9cd7b0ce5c52a3dac7347084651d7df0b39a6d0.tar.gz glibc-c9cd7b0ce5c52a3dac7347084651d7df0b39a6d0.tar.bz2 | |
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/powerpc64/dl-machine.h')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/dl-machine.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sysdeps/powerpc/powerpc64/dl-machine.h b/sysdeps/powerpc/powerpc64/dl-machine.h index aeb91b8..76dceee 100644 --- a/sysdeps/powerpc/powerpc64/dl-machine.h +++ b/sysdeps/powerpc/powerpc64/dl-machine.h @@ -27,6 +27,7 @@ #include <dl-tls.h> #include <sysdep.h> #include <hwcapinfo.h> +#include <cpu-features.c> /* Translate a processor specific dynamic tag to the index in l_info array. */ @@ -300,13 +301,14 @@ BODY_PREFIX "_dl_start_user:\n" \ /* We define an initialization function to initialize HWCAP/HWCAP2 and platform data so it can be copied into the TCB later. This is called very early in _dl_sysdep_start for dynamically linked binaries. */ -#ifdef SHARED +#if defined(SHARED) && IS_IN (rtld) # define DL_PLATFORM_INIT dl_platform_init () static inline void __attribute__ ((unused)) dl_platform_init (void) { __tcb_parse_hwcap_and_convert_at_platform (); + init_cpu_features (&GLRO(dl_powerpc_cpu_features)); } #endif |