int arena; /* size of data segment used by malloc */
int ordblks; /* number of free chunks */
int smblks; /* number of fast bins */
int hblks; /* number of anonymous mappings */
int hblkhd; /* size of anonymous mappings */
int usmblks; /* maximum total allocated size */
int fsmblks; /* size of available fast bins */
int uordblks; /* size of total allocated space */
int fordblks; /* size of available chunks */
int keepcost; ...
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