Github user mingzym commented on the issue:
https://github.com/apache/trafficserver/issues/1532
I'd suggest you should take a look what @scw00 commented, base on man
malloc:
```
Normally, malloc() allocates memory from the heap, and adjusts the size of
the heap as required, using sbrk(2). When allocating blocks of memory larger
than MMAP_THRESHOLD bytes, the glibc malloc() implementation allocates
the memory as a private anonymous mapping using mmap(2).
MMAP_THRESHOLD is 128 kB by default, but is adjustable using mallopt(3).
Allocations performed using mmap(2) are unaffected by the RLIMIT_DATA resource
limit (see
getrlimit(2)).
```
a malloc may tigger a mmap() when doing the real alloc, so things may get
complex with default sysctrl config, please take a look.
and I thinks that before TS-1822 the default M_MMAP_MAX = 2097152, no harm
and it will bump the default 64K to 2M, it is a good if you used many mmap in
your system.
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