facebook/hhvm — pull request #4199 by atdt (2014-11-10 05:46:57+00:00)
Title: Admin server: add /jemalloc-proc-status command

Turning on jemalloc's heap profiling can substantially impact speed and
stability. If it can be toggled on and off at runtime, its state ought to be
queryable at runtime too. Sample use-case: alerting for servers that have heap
profiling turned on.