Doug Lea分配器产生奇怪的malloc行为
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我有一个非常小的系统，只有16kb的堆，没有mmap，没有交换。我正在使用最新版本的Doug Lea分配器2.8.5 ftp://g.oswego.edu/pub/misc/malloc-2.8.5.c
UPDATE我制作了一个较小的测试用例，它更易于理解并查看我的问题是什么
如果我分配8kb，释放它，分配12kb，它就可以工作了（i！= NULL），我可以分配12 kb：
char *i;
dlstats();
i = dlmalloc(8192);
printf(\"DEBUG: %p\\n\", i);
dlstats();
dlfree(i);
dlstats();
i = dlmalloc(12288);
printf(\"DEBUG: %p\\n\", i);
dlstats();
dlfree(i);
dlstats();
heap 0xa00003f0 sbrk 0xa00003f0 arena 0 ordblks 0 usmblks 0 uordblks 0 fordblks 0 keepcost 0
DEBUG: 0xa00003f8
heap 0xa00003f0 sbrk 0xa0002440 arena 8272 ordblks 1 usmblks 8272 uordblks 8200 fordblks 72 keepcost 32
heap 0xa00003f0 sbrk 0xa0002440 arena 8272 ordblks 1 usmblks 8272 uordblks 0 fordblks 8272 keepcost 8232
DEBUG: 0xa00003f8
heap 0xa00003f0 sbrk 0xa0003460 arena 12400 ordblks 1 usmblks 12400 uordblks 12296 fordblks 104 keepcost 64
heap 0xa00003f0 sbrk 0xa0003460 arena 12400 ordblks 1 usmblks 12400 uordblks 0 fordblks 12400 keepcost 12360
char *i;
dlstats();
i = dlmalloc(30000);
printf(\"DEBUG: %p\\n\", i);
dlstats();
i = dlmalloc(8192);
printf(\"DEBUG: %p\\n\", i);
dlstats();
dlfree(i);
dlstats();
i = dlmalloc(12288);
printf(\"DEBUG: %p\\n\", i);
dlstats();
dlfree(i);
dlstats();
heap 0xa00003f0 sbrk 0xa00003f0 arena 0 ordblks 0 usmblks 0 uordblks 0 fordblks 0 keepcost 0
DEBUG: 0x0
heap 0xa00003f0 sbrk 0xa00003f0 arena 0 ordblks 0 usmblks 0 uordblks 0 fordblks 0 keepcost 0
DEBUG: 0xa00003f8
heap 0xa00003f0 sbrk 0xa0002430 arena 8256 ordblks 1 usmblks 8256 uordblks 8200 fordblks 56 keepcost 16
heap 0xa00003f0 sbrk 0xa0002430 arena 8256 ordblks 1 usmblks 8256 uordblks 0 fordblks 8256 keepcost 8216
DEBUG: 0x0
heap 0xa00003f0 sbrk 0xa0002430 arena 8256 ordblks 1 usmblks 8256 uordblks 0 fordblks 8256 keepcost 8216
heap 0xa00003f0 sbrk 0xa0002430 arena 8256 ordblks 1 usmblks 8256 uordblks 0 fordblks 8256 keepcost 8216
没有找到相关结果
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2 个回复
惜堡沁戚
else disable_contiguous(m); /* Don\'t try contiguous path in the future */辟官陡板休