commit | f18611c426b442e20d2726a62badc4d28fa9fce4 | [log] [tgz] |
---|---|---|
author | Bob Badour <bbadour@google.com> | Wed Mar 25 18:56:44 2020 -0700 |
committer | Bob Badour <bbadour@google.com> | Wed Mar 25 18:56:44 2020 -0700 |
tree | 3812035e8959d3789cfa687c19a9114130fa3487 | |
parent | fbbf17e168c56a99512f9db5241b80860dfcdb2c [diff] |
Remove redundant NOTICE copied from LICENSE. Identified using the below shell script: $ find -H . -name LICENSE -type f -print0 | xargs -0 dirname \ | while read dir; do \ if [ -f "${dir}/NOTICE" ] \ && diff "${dir}/LICENSE" "${dir}/NOTICE" >/dev/null; then \ echo "${dir}/NOTICE"; \ fi; \ done Now that http://r.android.com/r/1235427 and http://r.android.com/r/1238719 are merged, LICENSE files copied into NOTICE files are no longer needed. Bug: 67772237 Bug: 68860345 Test: manually built and diffed before and after system image notices Change-Id: I28a095969914eb80b24423f9adcd80be95e630be
cpuinfo is a library to detect essential for performance optimization information about host CPU.
Log processor name:
cpuinfo_initialize(); printf("Running on %s CPU\n", cpuinfo_get_package(0)->name);
Detect if target is a 32-bit or 64-bit ARM system:
#if CPUINFO_ARCH_ARM || CPUINFO_ARCH_ARM64 /* 32-bit ARM-specific code here */ #endif
Check if the host CPU support ARM NEON
cpuinfo_initialize(); if (cpuinfo_has_arm_neon()) { neon_implementation(arguments); }
Check if the host CPU supports x86 AVX
cpuinfo_initialize(); if (cpuinfo_has_x86_avx()) { avx_implementation(arguments); }
Check if the thread runs on a Cortex-A53 core
cpuinfo_initialize(); switch (cpuinfo_get_current_core()->uarch) { case cpuinfo_uarch_cortex_a53: cortex_a53_implementation(arguments); break; default: generic_implementation(arguments); break; }
Get the size of level 1 data cache on the fastest core in the processor (e.g. big core in big.LITTLE ARM systems):
cpuinfo_initialize(); const size_t l1_size = cpuinfo_get_processor(0)->cache.l1d->size;
Pin thread to cores sharing L2 cache with the current core (Linux or Android)
cpuinfo_initialize(); cpu_set_t cpu_set; CPU_ZERO(&cpu_set); const struct cpuinfo_cache* current_l2 = cpuinfo_get_current_processor()->cache.l2; for (uint32_t i = 0; i < current_l2->processor_count; i++) { CPU_SET(cpuinfo_get_processor(current_l2->processor_start + i)->linux_id, &cpu_set); } pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpu_set);
/proc/cpuinfo
on ARMro.chipname
, ro.board.platform
, ro.product.board
, ro.mediatek.platform
, ro.arch
properties (Android)dmesg
) on ARM Linux/proc/cpuinfo
on 32-bit ARM EABI (Linux)FPSID
and WCID
registers (32-bit ARM)getauxval
(Linux/ARM)/proc/self/auxv
(Android/ARM)/proc/cpuinfo
(Linux/pre-ARMv7)sysctlbyname
(Mach)typology
directories (ARM/Linux)cache
directories (Linux)/proc/cpuinfo
(Linux)host_info
(Mach)GetLogicalProcessorInformationEx
(Windows)