mallinfo.c

来自「一个嵌入式C库」· C语言 代码 · 共 107 行

/*
  This is a version (aka dlmalloc) of malloc/free/realloc written by
  Doug Lea and released to the public domain.  Use, modify, and
  redistribute this code without permission or acknowledgement in any
  way you wish.  Send questions, comments, complaints, performance
  data, etc to [e-mail]

  VERSION 2.7.2 Sat Aug 17 09:07:30 2002  Doug Lea  (dl at gee)

  Note: There may be an updated version of this malloc obtainable at
           ftp://gee.cs.oswego.edu/pub/misc/malloc.c
  Check before installing!

  Hacked up for uClibc by Erik Andersen <[e-mail]>
*/

#include "malloc.h"


/* ------------------------------ mallinfo ------------------------------ */
struct mallinfo mallinfo(void)
{
    mstate av;
    struct mallinfo mi;
    int i;
    mbinptr b;
    mchunkptr p;
    size_t avail;
    size_t fastavail;
    int nblocks;
    int nfastblocks;

    LOCK;
    av = get_malloc_state();
    /* Ensure initialization */
    if (av->top == 0)  {
	__malloc_consolidate(av);
    }

    check_malloc_state();

    /* Account for top */
    avail = chunksize(av->top);
    nblocks = 1;  /* top always exists */

    /* traverse fastbins */
    nfastblocks = 0;
    fastavail = 0;

    for (i = 0; i < NFASTBINS; ++i) {
	for (p = av->fastbins[i]; p != 0; p = p->fd) {
	    ++nfastblocks;
	    fastavail += chunksize(p);
	}
    }

    avail += fastavail;

    /* traverse regular bins */
    for (i = 1; i < NBINS; ++i) {
	b = bin_at(av, i);
	for (p = last(b); p != b; p = p->bk) {
	    ++nblocks;
	    avail += chunksize(p);
	}
    }

    mi.smblks = nfastblocks;
    mi.ordblks = nblocks;
    mi.fordblks = avail;
    mi.uordblks = av->sbrked_mem - avail;
    mi.arena = av->sbrked_mem;
    mi.hblks = av->n_mmaps;
    mi.hblkhd = av->mmapped_mem;
    mi.fsmblks = fastavail;
    mi.keepcost = chunksize(av->top);
    mi.usmblks = av->max_total_mem;
    UNLOCK;
    return mi;
}

void malloc_stats(FILE *file)
{
    struct mallinfo mi;

    if (file==NULL) {
	file = stderr;
    }

    mi = mallinfo();
    fprintf(file, "total bytes allocated             = %10lu\n", (unsigned int)(mi.arena + mi.hblkhd));
    fprintf(file, "total bytes in use bytes          = %10lu\n", (unsigned int)(mi.uordblks + mi.hblkhd));
    fprintf(file, "total non-mmapped bytes allocated = %10lu\n", (unsigned int)(mi.arena));
    fprintf(file, "number of mmapped regions         = %10lu\n", (unsigned int)(mi.hblks));
    fprintf(file, "total allocated mmap space        = %10lu\n", (unsigned int)(mi.hblkhd));
    fprintf(file, "total allocated sbrk space        = %10lu\n", (unsigned int)(mi.uordblks));
#if 0
    fprintf(file, "number of free chunks             = %10lu\n", (unsigned int)(mi.ordblks));
    fprintf(file, "number of fastbin blocks          = %10lu\n", (unsigned int)(mi.smblks));
    fprintf(file, "space in freed fastbin blocks     = %10lu\n", (unsigned int)(mi.fsmblks));
#endif
    fprintf(file, "maximum total allocated space     = %10lu\n", (unsigned int)(mi.usmblks));
    fprintf(file, "total free space                  = %10lu\n", (unsigned int)(mi.fordblks));
    fprintf(file, "memory releasable via malloc_trim = %10lu\n", (unsigned int)(mi.keepcost));
}