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/* Copyright (C) 2021 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "precompiled.h"
#include "lib/sysdep/os_cpu.h"
#include "lib/alignment.h"
#include "lib/bits.h"
#include "lib/config2.h"
#include "lib/module_init.h"
#if CONFIG2_VALGRIND
# include "valgrind.h"
#endif
size_t os_cpu_NumProcessors()
{
static size_t numProcessors;
if(numProcessors == 0)
{
#if CONFIG2_VALGRIND
// Valgrind reports the number of real CPUs, but only emulates a single CPU.
// That causes problems when we expect all those CPUs to be distinct, so
// just pretend there's only one CPU
if (RUNNING_ON_VALGRIND)
numProcessors = 1;
else
#endif
{
long res = sysconf(_SC_NPROCESSORS_CONF);
ENSURE(res != -1);
numProcessors = (size_t)res;
}
}
return numProcessors;
}
uintptr_t os_cpu_ProcessorMask()
{
static uintptr_t processorMask;
if(!processorMask)
processorMask = bit_mask<uintptr_t>(os_cpu_NumProcessors());
return processorMask;
}
size_t os_cpu_PageSize()
{
static size_t pageSize;
if(!pageSize)
pageSize = (size_t)sysconf(_SC_PAGESIZE);
return pageSize;
}
size_t os_cpu_LargePageSize()
{
// assume they're unsupported.
return 0;
}
size_t os_cpu_QueryMemorySize()
{
const uint64_t memorySize = (uint64_t)sysconf(_SC_PHYS_PAGES) * os_cpu_PageSize();
return size_t(memorySize / MiB);
}
size_t os_cpu_MemoryAvailable()
{
const uint64_t memoryAvailableBytes = (uint64_t)sysconf(_SC_AVPHYS_PAGES) * os_cpu_PageSize();
const size_t memoryAvailable = size_t(memoryAvailableBytes / MiB);
return memoryAvailable;
}
#if OS_ANDROID
// the current Android NDK (r7-crystax-4) doesn't support sched_setaffinity,
// so provide a stub implementation instead
uintptr_t os_cpu_SetThreadAffinityMask(uintptr_t UNUSED(processorMask))
{
// not yet implemented
return os_cpu_ProcessorMask();
}
#else
// glibc __CPU_SETSIZE=1024 is smaller than required on some Linux (4096),
// but the CONFIG_NR_CPUS in a header may not reflect the actual kernel,
// so we have to detect the limit at runtime.
// (see https://gitea.wildfiregames.com/0ad/0ad/issues/547 for additional information)
static size_t maxCpus;
static bool IsMaxCpusSufficient()
{
const size_t setSize = CPU_ALLOC_SIZE(maxCpus);
cpu_set_t* set = CPU_ALLOC(maxCpus);
ENSURE(set);
const int ret = sched_getaffinity(0, setSize, set);
CPU_FREE(set);
if(ret == 0)
return true;
ENSURE(errno == EINVAL);
return false;
}
static Status DetectMaxCpus()
{
// the most I have ever heard of is CONFIG_NR_CPUS=4096,
// and even that limit should be enough for years and years.
for(maxCpus = 64; maxCpus <= 65536; maxCpus *= 2)
{
if(IsMaxCpusSufficient())
return INFO::OK;
}
return ERR::FAIL;
}
uintptr_t os_cpu_SetThreadAffinityMask(uintptr_t processorMask)
{
static ModuleInitState maxCpusInitState;
(void)ModuleInit(&maxCpusInitState, DetectMaxCpus);
const size_t setSize = CPU_ALLOC_SIZE(maxCpus);
cpu_set_t* set = CPU_ALLOC(maxCpus);
ENSURE(set);
uintptr_t previousProcessorMask = 0;
{
int ret = sched_getaffinity(0, setSize, set);
ENSURE(ret == 0);
for(size_t processor = 0; processor < os_cpu_NumProcessors(); processor++)
{
if(CPU_ISSET_S(processor, setSize, set))
previousProcessorMask |= uintptr_t(1) << processor;
}
}
CPU_ZERO_S(setSize, set);
for(size_t processor = 0; processor < os_cpu_NumProcessors(); processor++)
{
if(IsBitSet(processorMask, processor))
CPU_SET_S(processor, setSize, set);
}
int ret = sched_setaffinity(0, setSize, set);
ENSURE(ret == 0);
// (The process gets migrated immediately by the setaffinity call)
CPU_FREE(set);
return previousProcessorMask;
}
#endif
Status os_cpu_CallByEachCPU(OsCpuCallback cb, uintptr_t cbData)
{
const uintptr_t previousAffinity = os_cpu_SetThreadAffinityMask(os_cpu_ProcessorMask());
for(size_t processor = 0; processor < os_cpu_NumProcessors(); processor++)
{
const uintptr_t processorMask = uintptr_t(1) << processor;
os_cpu_SetThreadAffinityMask(processorMask);
cb(processor, cbData);
}
(void)os_cpu_SetThreadAffinityMask(previousAffinity);
return INFO::OK;
}
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