Github user jpeach commented on the pull request:
https://github.com/apache/trafficserver/pull/489#issuecomment-186952049
Are you sure there isn't a better way to do this?
- it is fairly ugly
- it duplicates the allocation size tracking the allocator is already doing
- it gets the alignment wrong in some cases (ie. you won't be 16 byte
aligned any more).
[glibc](http://man7.org/linux/man-pages/man3/malloc_usable_size.3.html) and
[jemalloc](https://www.freebsd.org/cgi/man.cgi?query=malloc_usable_size) both
provide ``malloc_usable_size``, which seems like it will tell you what you need
to know here.
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