140 lines
2.8 KiB
C
140 lines
2.8 KiB
C
#include <errno.h>
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#include <inttypes.h>
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#include <asm/bug.h>
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#include <linux/bitmap.h>
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#include <linux/kernel.h>
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#include <linux/zalloc.h>
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#include "debug.h"
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#include "env.h"
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#include "mem2node.h"
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struct phys_entry {
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struct rb_node rb_node;
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u64 start;
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u64 end;
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u64 node;
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};
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static void phys_entry__insert(struct phys_entry *entry, struct rb_root *root)
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{
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struct rb_node **p = &root->rb_node;
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struct rb_node *parent = NULL;
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struct phys_entry *e;
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while (*p != NULL) {
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parent = *p;
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e = rb_entry(parent, struct phys_entry, rb_node);
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if (entry->start < e->start)
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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(&entry->rb_node, parent, p);
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rb_insert_color(&entry->rb_node, root);
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}
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static void
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phys_entry__init(struct phys_entry *entry, u64 start, u64 bsize, u64 node)
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{
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entry->start = start;
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entry->end = start + bsize;
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entry->node = node;
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RB_CLEAR_NODE(&entry->rb_node);
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}
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int mem2node__init(struct mem2node *map, struct perf_env *env)
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{
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struct memory_node *n, *nodes = &env->memory_nodes[0];
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struct phys_entry *entries, *tmp_entries;
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u64 bsize = env->memory_bsize;
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int i, j = 0, max = 0;
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memset(map, 0x0, sizeof(*map));
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map->root = RB_ROOT;
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for (i = 0; i < env->nr_memory_nodes; i++) {
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n = &nodes[i];
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max += bitmap_weight(n->set, n->size);
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}
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entries = zalloc(sizeof(*entries) * max);
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if (!entries)
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return -ENOMEM;
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for (i = 0; i < env->nr_memory_nodes; i++) {
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u64 bit;
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n = &nodes[i];
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for (bit = 0; bit < n->size; bit++) {
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u64 start;
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if (!test_bit(bit, n->set))
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continue;
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start = bit * bsize;
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/*
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* Merge nearby areas, we walk in order
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* through the bitmap, so no need to sort.
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*/
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if (j > 0) {
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struct phys_entry *prev = &entries[j - 1];
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if ((prev->end == start) &&
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(prev->node == n->node)) {
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prev->end += bsize;
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continue;
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}
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}
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phys_entry__init(&entries[j++], start, bsize, n->node);
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}
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}
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/* Cut unused entries, due to merging. */
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tmp_entries = realloc(entries, sizeof(*entries) * j);
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if (tmp_entries ||
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WARN_ONCE(j == 0, "No memory nodes, is CONFIG_MEMORY_HOTPLUG enabled?\n"))
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entries = tmp_entries;
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for (i = 0; i < j; i++) {
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pr_debug("mem2node %03" PRIu64 " [0x%016" PRIx64 "-0x%016" PRIx64 "]\n",
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entries[i].node, entries[i].start, entries[i].end);
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phys_entry__insert(&entries[i], &map->root);
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}
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map->entries = entries;
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return 0;
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}
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void mem2node__exit(struct mem2node *map)
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{
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zfree(&map->entries);
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}
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int mem2node__node(struct mem2node *map, u64 addr)
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{
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struct rb_node **p, *parent = NULL;
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struct phys_entry *entry;
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p = &map->root.rb_node;
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while (*p != NULL) {
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parent = *p;
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entry = rb_entry(parent, struct phys_entry, rb_node);
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if (addr < entry->start)
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p = &(*p)->rb_left;
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else if (addr >= entry->end)
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p = &(*p)->rb_right;
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else
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goto out;
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}
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entry = NULL;
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out:
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return entry ? (int) entry->node : -1;
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}
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