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36 lines
1.1 KiB
36 lines
1.1 KiB
#pragma once
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#include <assert.h>
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#include <stdint.h>
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#include "lock.h"
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enum
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{
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PERF_WINDOW_CAPACITY = 32
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};
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static_assert(PERF_WINDOW_CAPACITY && !(PERF_WINDOW_CAPACITY & (PERF_WINDOW_CAPACITY - 1)),
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"PERF_WINDOW_CAPACITY must be power of 2!");
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static_assert(PERF_WINDOW_CAPACITY <= UINT16_MAX, "PERF_WINDOW_CAPACITY must be indexable by a 16-bit unsigned int");
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/*
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* The by_duration array sorts the last N executions by execution time
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* The by_termination array acts as a circular buffer that maps to indices in the by_duration array
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*
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* by_termination ensures that the when the circular buffer is full, the oldest data in both arrays is
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* overwritten, providing a sorted circular buffer
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*/
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struct execution_node {
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uint64_t execution_time;
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uint16_t by_termination_idx; /* Reverse idx of the associated by_termination bin. Used for swaps! */
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};
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struct perf_window {
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struct execution_node by_duration[PERF_WINDOW_CAPACITY];
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uint16_t by_termination[PERF_WINDOW_CAPACITY];
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uint64_t count;
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lock_t lock;
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};
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