tcache.flush mallctl was renamed in jemalloc3, update
commit571f8a98566f6030af0a603a41bc45d024e200fe
authorNathan Bronson <ngbronson@fb.com>
Tue, 4 Feb 2014 05:02:08 +0000 (3 21:02 -0800)
committerSara Golemon <sgolemon@fb.com>
Sat, 8 Feb 2014 00:53:02 +0000 (7 16:53 -0800)
tree781744f428948d45ea0f93388a7fc10f93e79d91
parentf84abb749b29f864aadaa32db3aae8d7b37a32a6
tcache.flush mallctl was renamed in jemalloc3, update

Since upgrading to jemalloc3 hhvm hasn't actually been flushing
the tcache during idle times.  That bug has also been masking a bug in
which we still try to purge thread.arena despite overriding jemalloc
narenas to be 1, so I have removed that code as well.

Reviewed By: @jasone

Differential Revision: D1157139
hphp/NEWS
hphp/util/alloc.cpp