Re: malloc_stats(3) man page for review

Hi

.B void malloc_stats(void);
.SH DESCRIPTION
The
.BR malloc_stats ()
function prints (on standard error) statistics about memory allocated by
.BR malloc (3)
and related functions.
For each arena (allocation area), this function prints
the total amount of memory allocated by means other than
.BR mmap (2)

If I understand correctly, A chunk that allocated by mmap (i.e.
IS_MMAPD marked one)
doesn't belong to arena. iow, chunk_for_arena() don't work for mmaped
chunk. then,

For each arena (allocation area), this function prints
the total amount of memory.

is enough.

and the total number of bytes consumed by in-use allocations.
(These two values correspond to the
.I arena
and
.I uordblks
fields retrieved by
.BR mallinfo (3).)
In addition,
the function prints the sum of these two statistics for all arenas,
and the maximum number of blocks and bytes that were ever simultaneously
allocated using
.BR mmap (2).

If I understand correctly, this function output  "Total (incl.
mmap):\n" header, but
"system bytes" and "in use bytes" don't include mmaped chunk. So, It would be
nice if a bug section describe it.

But I'm not an expert on this area. Please don't 100% trust me.
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