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41 lines
1.4 KiB
41 lines
1.4 KiB
/* Copyright (c) 2016-2017 The Linux Foundation. All rights reserved.
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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 version 2 and
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* only version 2 as published by the Free Software Foundation.
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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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#ifndef __STORM_WATCH_H
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#define __STORM_WATCH_H
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#include <linux/ktime.h>
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#include <linux/mutex.h>
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/**
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* Data used to track an event storm.
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*
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* @storm_period_ms: The maximum time interval between two events. If this limit
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* is exceeded then the event chain will be broken and removed
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* from consideration for a storm.
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* @max_storm_count: The number of chained events required to trigger a storm.
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* @storm_count: The current number of chained events.
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* @last_kt: Kernel time of the last event seen.
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* @storm_lock: Mutex lock to protect storm_watch data.
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*/
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struct storm_watch {
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bool enabled;
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int storm_period_ms;
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int max_storm_count;
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int storm_count;
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ktime_t last_kt;
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struct mutex storm_lock;
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};
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bool is_storming(struct storm_watch *data);
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void reset_storm_count(struct storm_watch *data);
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void update_storm_count(struct storm_watch *data, int max_count);
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#endif
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