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76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/*
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* Copyright (C) 2025 Andrea Mazzoleni
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __THERMAL_H
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#define __THERMAL_H
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#include "elem.h"
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/****************************************************************************/
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/* thermal */
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/**
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* Period of temperature measures
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*/
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#define THERMAL_PERIOD_SECONDS 30
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/**
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* Max number of temperature measures
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*/
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#define THERMAL_MAX 100
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/**
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* Minimum value of the R^2 to consider valid a measure
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*/
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#define THERMAL_R_SQUARED_LIMIT 0.9
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struct snapraid_thermal_point {
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double temperature; /**< Temperatures in celsius */
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double time; /**< Time in seconds */
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};
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struct snapraid_thermal_params {
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double k_heat; /**< Heating coefficient */
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double t_steady; /**< Steady state temperature during heating */
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double t_ambient; /**< Ambient temperature */
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double rmse; /**< Root mean square error of the fit */
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double r_squared; /**< Coefficient of determination */
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double max_error; /**< Maximum absolute error in fit */
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};
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struct snapraid_thermal {
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uint64_t device; /**< Device ID. */
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char name[PATH_MAX]; /**< Name of the disk. Note that it's not unique as more physical disks may map to the same logical disk */
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int latest_temperature; /**< Latest temperature */
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struct snapraid_thermal_point data[THERMAL_MAX]; /**< Measures. Stopped after the first sleep. */
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unsigned count; /**< Number of measures */
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struct snapraid_thermal_params params; /**< Estimated thermal parameters */
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tommy_node node; /**< Next node in the list. */
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};
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/**
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* Allocate a thermal state.
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*/
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struct snapraid_thermal* thermal_alloc(uint64_t dev, const char* name);
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/**
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* Deallocate a thermal state.
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*/
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void thermal_free(struct snapraid_thermal* thermal);
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#endif
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