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ca2270292e
At the cost of an extra pointer, we can avoid the O(logN) cost of finding the first element in the tree (smallest node), which is something required for any of the strlist or intlist traversals (XXX_for_each_entry()). There are a number of users in perf of these (particularly strlists), including probes, and buildid. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/20181206191819.30182-5-dave@stgolabs.net Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PERF_INTLIST_H
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#define __PERF_INTLIST_H
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#include <linux/rbtree.h>
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#include <stdbool.h>
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#include "rblist.h"
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struct int_node {
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struct rb_node rb_node;
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int i;
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void *priv;
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};
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struct intlist {
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struct rblist rblist;
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};
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struct intlist *intlist__new(const char *slist);
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void intlist__delete(struct intlist *ilist);
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void intlist__remove(struct intlist *ilist, struct int_node *in);
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int intlist__add(struct intlist *ilist, int i);
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struct int_node *intlist__entry(const struct intlist *ilist, unsigned int idx);
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struct int_node *intlist__find(struct intlist *ilist, int i);
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struct int_node *intlist__findnew(struct intlist *ilist, int i);
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static inline bool intlist__has_entry(struct intlist *ilist, int i)
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{
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return intlist__find(ilist, i) != NULL;
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}
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static inline bool intlist__empty(const struct intlist *ilist)
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{
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return rblist__empty(&ilist->rblist);
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}
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static inline unsigned int intlist__nr_entries(const struct intlist *ilist)
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{
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return rblist__nr_entries(&ilist->rblist);
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}
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/* For intlist iteration */
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static inline struct int_node *intlist__first(struct intlist *ilist)
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{
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struct rb_node *rn = rb_first_cached(&ilist->rblist.entries);
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return rn ? rb_entry(rn, struct int_node, rb_node) : NULL;
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}
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static inline struct int_node *intlist__next(struct int_node *in)
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{
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struct rb_node *rn;
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if (!in)
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return NULL;
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rn = rb_next(&in->rb_node);
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return rn ? rb_entry(rn, struct int_node, rb_node) : NULL;
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}
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/**
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* intlist__for_each_entry - iterate over a intlist
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* @pos: the &struct int_node to use as a loop cursor.
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* @ilist: the &struct intlist for loop.
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*/
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#define intlist__for_each_entry(pos, ilist) \
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for (pos = intlist__first(ilist); pos; pos = intlist__next(pos))
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/**
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* intlist__for_each_entry_safe - iterate over a intlist safe against removal of
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* int_node
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* @pos: the &struct int_node to use as a loop cursor.
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* @n: another &struct int_node to use as temporary storage.
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* @ilist: the &struct intlist for loop.
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*/
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#define intlist__for_each_entry_safe(pos, n, ilist) \
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for (pos = intlist__first(ilist), n = intlist__next(pos); pos;\
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pos = n, n = intlist__next(n))
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#endif /* __PERF_INTLIST_H */
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