147 lines
4.7 KiB
C
147 lines
4.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _PERF_RESORT_RB_H_
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#define _PERF_RESORT_RB_H_
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/*
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* Template for creating a class to resort an existing rb_tree according to
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* a new sort criteria, that must be present in the entries of the source
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* rb_tree.
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*
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* (c) 2016 Arnaldo Carvalho de Melo <acme@redhat.com>
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*
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* Quick example, resorting threads by its shortname:
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*
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* First define the prefix (threads) to be used for the functions and data
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* structures created, and provide an expression for the sorting, then the
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* fields to be present in each of the entries in the new, sorted, rb_tree.
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*
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* The body of the init function should collect the fields, maybe
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* pre-calculating them from multiple entries in the original 'entry' from
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* the rb_tree used as a source for the entries to be sorted:
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DEFINE_RB_RESORT_RB(threads, strcmp(a->thread->shortname,
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b->thread->shortname) < 0,
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struct thread *thread;
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)
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{
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entry->thread = rb_entry(nd, struct thread, rb_node);
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}
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* After this it is just a matter of instantiating it and iterating it,
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* for a few data structures with existing rb_trees, such as 'struct machine',
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* helpers are available to get the rb_root and the nr_entries:
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DECLARE_RESORT_RB_MACHINE_THREADS(threads, machine_ptr);
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* This will instantiate the new rb_tree and a cursor for it, that can be used as:
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struct rb_node *nd;
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resort_rb__for_each_entry(nd, threads) {
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struct thread *t = threads_entry;
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printf("%s: %d\n", t->shortname, t->tid);
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}
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* Then delete it:
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resort_rb__delete(threads);
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* The name of the data structures and functions will have a _sorted suffix
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* right before the method names, i.e. will look like:
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*
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* struct threads_sorted_entry {}
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* threads_sorted__insert()
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*/
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#define DEFINE_RESORT_RB(__name, __comp, ...) \
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struct __name##_sorted_entry { \
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struct rb_node rb_node; \
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__VA_ARGS__ \
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}; \
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static void __name##_sorted__init_entry(struct rb_node *nd, \
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struct __name##_sorted_entry *entry); \
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\
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static int __name##_sorted__cmp(struct rb_node *nda, struct rb_node *ndb) \
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{ \
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struct __name##_sorted_entry *a, *b; \
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a = rb_entry(nda, struct __name##_sorted_entry, rb_node); \
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b = rb_entry(ndb, struct __name##_sorted_entry, rb_node); \
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return __comp; \
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} \
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\
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struct __name##_sorted { \
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struct rb_root entries; \
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struct __name##_sorted_entry nd[0]; \
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}; \
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\
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static void __name##_sorted__insert(struct __name##_sorted *sorted, \
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struct rb_node *sorted_nd) \
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{ \
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struct rb_node **p = &sorted->entries.rb_node, *parent = NULL; \
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while (*p != NULL) { \
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parent = *p; \
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if (__name##_sorted__cmp(sorted_nd, parent)) \
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p = &(*p)->rb_left; \
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else \
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p = &(*p)->rb_right; \
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} \
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rb_link_node(sorted_nd, parent, p); \
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rb_insert_color(sorted_nd, &sorted->entries); \
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} \
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\
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static void __name##_sorted__sort(struct __name##_sorted *sorted, \
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struct rb_root *entries) \
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{ \
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struct rb_node *nd; \
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unsigned int i = 0; \
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for (nd = rb_first(entries); nd; nd = rb_next(nd)) { \
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struct __name##_sorted_entry *snd = &sorted->nd[i++]; \
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__name##_sorted__init_entry(nd, snd); \
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__name##_sorted__insert(sorted, &snd->rb_node); \
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} \
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} \
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\
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static struct __name##_sorted *__name##_sorted__new(struct rb_root *entries, \
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int nr_entries) \
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{ \
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struct __name##_sorted *sorted; \
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sorted = malloc(sizeof(*sorted) + sizeof(sorted->nd[0]) * nr_entries); \
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if (sorted) { \
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sorted->entries = RB_ROOT; \
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__name##_sorted__sort(sorted, entries); \
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} \
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return sorted; \
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} \
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\
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static void __name##_sorted__delete(struct __name##_sorted *sorted) \
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{ \
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free(sorted); \
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} \
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\
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static void __name##_sorted__init_entry(struct rb_node *nd, \
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struct __name##_sorted_entry *entry)
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#define DECLARE_RESORT_RB(__name) \
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struct __name##_sorted_entry *__name##_entry; \
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struct __name##_sorted *__name = __name##_sorted__new
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#define resort_rb__for_each_entry(__nd, __name) \
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for (__nd = rb_first(&__name->entries); \
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__name##_entry = rb_entry(__nd, struct __name##_sorted_entry, \
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rb_node), __nd; \
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__nd = rb_next(__nd))
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#define resort_rb__delete(__name) \
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__name##_sorted__delete(__name), __name = NULL
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/*
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* Helpers for other classes that contains both an rbtree and the
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* number of entries in it:
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*/
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/* For 'struct intlist' */
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#define DECLARE_RESORT_RB_INTLIST(__name, __ilist) \
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DECLARE_RESORT_RB(__name)(&__ilist->rblist.entries.rb_root, \
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__ilist->rblist.nr_entries)
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#endif /* _PERF_RESORT_RB_H_ */
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