android/src/je_mallinfo.c

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "jemalloc/internal/jemalloc_internal.h"

extern unsigned narenas_auto;
extern malloc_mutex_t arenas_lock;
extern arena_t **arenas;

// This is an implementation that uses the same arena access pattern found
// in the arena_stats_merge function from src/arena.c.
struct mallinfo je_mallinfo() {
  struct mallinfo mi;
  memset(&mi, 0, sizeof(mi));

  malloc_mutex_lock(&arenas_lock);
  for (unsigned i = 0; i < narenas_auto; i++) {
    if (arenas[i] != NULL) {
      malloc_mutex_lock(&arenas[i]->lock);
      mi.hblkhd += arenas[i]->stats.mapped;
      mi.uordblks += arenas[i]->stats.allocated_large;
      mi.uordblks += arenas[i]->stats.allocated_huge;
      malloc_mutex_unlock(&arenas[i]->lock);

      for (unsigned j = 0; j < NBINS; j++) {
        arena_bin_t* bin = &arenas[i]->bins[j];

        malloc_mutex_lock(&bin->lock);
        mi.uordblks += bin->stats.allocated;
        malloc_mutex_unlock(&bin->lock);
      }
    }
  }
  malloc_mutex_unlock(&arenas_lock);
  mi.fordblks = mi.hblkhd - mi.uordblks;
  mi.usmblks = mi.hblkhd;
  return mi;
}