mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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Steffen Vogel
e743b42c6f
- Use C++ style comments - Harmonize indentions - Harmonize comment capitalization Signed-off-by: Steffen Vogel <post@steffenvogel.de>
134 lines
3.4 KiB
C++
134 lines
3.4 KiB
C++
/** Linux specific real-time optimizations
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*
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* @author Steffen Vogel <svogel2@eonerc.rwth-aachen.de>
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* @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
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* @license Apache License 2.0
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*********************************************************************************/
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#include <sched.h>
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#include <unistd.h>
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#include <villas/log.hpp>
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#include <villas/cpuset.hpp>
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#include <villas/config.hpp>
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#include <villas/utils.hpp>
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#include <villas/exceptions.hpp>
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#include <villas/kernel/kernel.hpp>
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#include <villas/kernel/kernel.hpp>
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#include <villas/kernel/rt.hpp>
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#ifdef __linux__
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using villas::utils::CpuSet;
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#endif // __linux__
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namespace villas {
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namespace kernel {
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namespace rt {
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void init(int priority, int affinity)
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{
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Logger logger = logging.get("kernel:rt");
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logger->info("Initialize sub-system");
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#ifdef __linux__
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int is_rt, is_isol;
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char isolcpus[255];
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// Use FIFO scheduler with real time priority
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is_rt = isPreemptible();
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if (!is_rt)
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logger->warn("We recommend to use an PREEMPT_RT patched kernel!");
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if (priority)
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setPriority(priority);
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else
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logger->warn("You might want to use the 'priority' setting to increase " PROJECT_NAME "'s process priority");
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if (affinity) {
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is_isol = getCmdlineParam("isolcpus", isolcpus, sizeof(isolcpus));
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if (is_isol)
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logger->warn("You should reserve some cores for " PROJECT_NAME " (see 'isolcpus')");
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else {
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CpuSet cset_pin(affinity);
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CpuSet cset_isol(isolcpus);
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CpuSet cset_non_isol = ~cset_isol & cset_pin;
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if (cset_non_isol.count() > 0)
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logger->warn("Affinity setting includes cores which are not isolated: affinity={}, isolcpus={}, non_isolated={}", (std::string) cset_pin, (std::string) cset_isol, (std::string) cset_non_isol);
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}
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setProcessAffinity(affinity);
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}
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else
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logger->warn("You might want to use the 'affinity' setting to pin " PROJECT_NAME " to dedicate CPU cores");
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#else
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logger->warn("This platform is not optimized for real-time execution");
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(void) affinity;
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(void) priority;
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#endif // __linux__
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}
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#ifdef __linux__
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void setProcessAffinity(int affinity)
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{
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int ret;
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assert(affinity != 0);
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Logger logger = logging.get("kernel:rt");
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// Pin threads to CPUs by setting the affinity
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CpuSet cset_pin(affinity);
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ret = sched_setaffinity(0, cset_pin.size(), cset_pin);
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if (ret)
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throw SystemError("Failed to set CPU affinity of process");
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logger->debug("Set affinity to {} {}", cset_pin.count() == 1 ? "core" : "cores", (std::string) cset_pin);
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}
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void setThreadAffinity(pthread_t thread, int affinity)
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{
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int ret;
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assert(affinity != 0);
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Logger logger = logging.get("kernel:rt");
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CpuSet cset_pin(affinity);
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ret = pthread_setaffinity_np(thread, cset_pin.size(), cset_pin);
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if (ret)
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throw SystemError("Failed to set CPU affinity of thread");
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logger->debug("Set affinity of thread {} to {} {}", (long unsigned) thread, cset_pin.count() == 1 ? "core" : "cores", (std::string) cset_pin);
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}
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void setPriority(int priority)
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{
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int ret;
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struct sched_param param;
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param.sched_priority = priority;
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Logger logger = logging.get("kernel:rt");
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ret = sched_setscheduler(0, SCHED_FIFO, ¶m);
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if (ret)
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throw SystemError("Failed to set real time priority");
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logger->debug("Task priority set to {}", priority);
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}
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bool isPreemptible()
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{
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return access(SYSFS_PATH "/kernel/realtime", R_OK) == 0;
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}
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#endif // __linux__
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} // namespace villas
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} // namespace kernel
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} // namespace rt
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