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62 lines
2.0 KiB
62 lines
2.0 KiB
#pragma once
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#include "debuglog.h"
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#include "perf_window.h"
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struct admissions_info {
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struct perf_window perf_window;
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int percentile; /* 50 - 99 */
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int control_index; /* Precomputed Lookup index when perf_window is full */
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uint64_t estimate; /* cycles */
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uint64_t relative_deadline; /* Relative deadline in cycles. This is duplicated state */
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};
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/**
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* Initializes perf window
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* @param self
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*/
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static inline void
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admissions_info_initialize(struct admissions_info *self, int percentile, uint64_t expected_execution,
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uint64_t relative_deadline)
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{
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#ifdef ADMISSIONS_CONTROL
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assert(relative_deadline > 0);
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assert(expected_execution > 0);
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self->relative_deadline = relative_deadline;
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self->estimate = admissions_control_calculate_estimate(expected_execution, relative_deadline);
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debuglog("Initial Estimate: %lu\n", self->estimate);
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assert(self != NULL);
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perf_window_initialize(&self->perf_window);
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if (unlikely(percentile < 50 || percentile > 99)) panic("Invalid admissions percentile");
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self->percentile = percentile;
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self->control_index = PERF_WINDOW_BUFFER_SIZE * percentile / 100;
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#ifdef LOG_ADMISSIONS_CONTROL
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debuglog("Percentile: %d\n", self->percentile);
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debuglog("Control Index: %d\n", self->control_index);
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#endif
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#endif
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}
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/*
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* Adds an execution value to the perf window and calculates and caches and updated estimate
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* @param self
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* @param execution_duration
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*/
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static inline void
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admissions_info_update(struct admissions_info *self, uint64_t execution_duration)
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{
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#ifdef ADMISSIONS_CONTROL
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assert(!software_interrupt_is_enabled());
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struct perf_window *perf_window = &self->perf_window;
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LOCK_LOCK(&self->perf_window.lock);
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perf_window_add(perf_window, execution_duration);
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uint64_t estimated_execution = perf_window_get_percentile(perf_window, self->percentile, self->control_index);
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self->estimate = admissions_control_calculate_estimate(estimated_execution, self->relative_deadline);
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LOCK_UNLOCK(&self->perf_window.lock);
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#endif
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}
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