PA: Add a stats comment.
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* allocations.
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*/
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/*
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* The stats for a particular pa_shard. Because of the way the ctl module
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* handles stats epoch data collection (it has its own arena_stats, and merges
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* the stats from each arena into it), this needs to live in the arena_stats_t;
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* hence we define it here and let the pa_shard have a pointer (rather than the
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* more natural approach of just embedding it in the pa_shard itself).
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*
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* We follow the arena_stats_t approach of marking the derived fields. These
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* are the ones that are not maintained on their own; instead, their values are
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* derived during those stats merges.
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*/
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typedef struct pa_shard_decay_stats_s pa_shard_decay_stats_t;
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struct pa_shard_decay_stats_s {
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/* Total number of purge sweeps. */
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