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Code Editor : map_runtime.h
/* -*- linux-c -*- * Map Runtime Functions * Copyright (C) 2012-2016 Red Hat Inc. * * This file is part of systemtap, and is free software. You can * redistribute it and/or modify it under the terms of the GNU General * Public License (GPL); either version 2, or (at your option) any * later version. */ #ifndef _LINUX_MAP_RUNTIME_H_ #define _LINUX_MAP_RUNTIME_H_ /* get/put_cpu wrappers. Unnecessary if caller is already atomic. */ #define MAP_GET_CPU() smp_processor_id() #define MAP_PUT_CPU() do {} while (0) struct pmap { int bit_shift; /* scale factor for integer arithmetic */ int stat_ops; /* related statistical operators */ MAP agg; /* aggregation map */ MAP map[]; /* per-cpu maps */ }; static inline MAP _stp_pmap_get_agg(PMAP p) { return p->agg; } static inline void _stp_pmap_set_agg(PMAP p, MAP agg) { p->agg = agg; } static inline MAP _stp_pmap_get_map(PMAP p, unsigned cpu) { if (cpu >= NR_CPUS) cpu = 0; return p->map[cpu]; } static inline void _stp_pmap_set_map(PMAP p, MAP m, unsigned cpu) { if (cpu >= NR_CPUS) cpu = 0; p->map[cpu] = m; } /** Deletes a map. * Deletes a map, freeing all memory in all elements. * Normally done only when the module exits. * @param map */ static void _stp_map_del(MAP map) { if (map == NULL) return; if (map->node_mem) _stp_vfree(map->node_mem); _stp_vfree(map); } static void _stp_pmap_del(PMAP pmap) { int i; if (pmap == NULL) return; for_each_possible_cpu(i) { MAP m = _stp_pmap_get_map (pmap, i); _stp_map_del(m); } /* free agg map elements */ _stp_map_del(_stp_pmap_get_agg(pmap)); _stp_vfree(pmap); } static void* _stp_map_vzalloc(size_t size, int cpu) { /* Called from module_init, so user context, may sleep alloc. */ if (cpu < 0) return _stp_vzalloc(size); return _stp_vzalloc_node(size, cpu_to_node(cpu)); } static int _stp_map_init(MAP m, unsigned max_entries, unsigned hash_table_mask, int wrap, int node_size, int cpu) { unsigned i; INIT_MLIST_HEAD(&m->pool); INIT_MLIST_HEAD(&m->head); m->hash_table_mask = hash_table_mask; for (i = 0; i <= hash_table_mask; i++) INIT_MHLIST_HEAD(&m->hashes[i]); m->maxnum = max_entries; m->wrap = wrap; /* Since we're using _stp_map_vzalloc(), we can afford to * allocate the nodes in one big chunk. */ m->node_mem = _stp_map_vzalloc(node_size * max_entries, cpu); if (m->node_mem == NULL) return -1; for (i = 0; i < max_entries; i++) { struct map_node *node = m->node_mem + i * node_size; mlist_add(&node->lnode, &m->pool); INIT_MHLIST_NODE(&node->hnode); } return 0; } /** Create a new map. * Maps must be created at module initialization time. * @param max_entries The maximum number of entries allowed. Currently that * number will be preallocated.If more entries are required, the oldest ones * will be deleted. This makes it effectively a circular buffer. * @return A MAP on success or NULL on failure. * @ingroup map_create */ static MAP _stp_map_new(unsigned max_entries, int wrap, int node_size, int cpu) { MAP m; unsigned hash_table_mask = HASHTABLESIZE(max_entries)-1; /* usable as bitmask */ m = _stp_map_vzalloc(sizeof(struct map_root) + sizeof(struct mhlist_head) * (hash_table_mask+1), cpu); if (m == NULL) return NULL; if (_stp_map_init(m, max_entries, hash_table_mask, wrap, node_size, cpu)) { _stp_map_del(m); return NULL; } return m; } static PMAP _stp_pmap_new(unsigned max_entries, int wrap, int node_size) { int i; MAP m; PMAP pmap = _stp_map_vzalloc(sizeof(struct pmap) + NR_CPUS * sizeof(MAP), -1); if (pmap == NULL) return NULL; /* Allocate the per-cpu maps. */ for_each_possible_cpu(i) { m = _stp_map_new(max_entries, wrap, node_size, i); if (m == NULL) goto err1; _stp_pmap_set_map(pmap, m, i); } /* Allocate the aggregate map. */ m = _stp_map_new(max_entries, wrap, node_size, -1); if (m == NULL) goto err1; _stp_pmap_set_agg(pmap, m); return pmap; err1: for_each_possible_cpu(i) { m = _stp_pmap_get_map (pmap, i); _stp_map_del(m); } _stp_vfree(pmap); return NULL; } #endif /* _LINUX_MAP_RUNTIME_H_ */
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