- gperftools 2.5, available 12 March 2016.
See https://github.com/gperftools/gperftools/releases
* Bryan Chan has contributed s390x support
* stacktrace capturing via libgcc's _Unwind_Backtrace was implemented
(for architectures with missing or broken libunwind).
* "emergency malloc" was implemented. Which unbreaks recursive calls
to malloc/free from stacktrace capturing functions (such us glib'c
backtrace() or libunwind on arm). It is enabled by
--enable-emergency-malloc configure flag or by default on arm when
--enable-stacktrace-via-backtrace is given. It is another fix for a
number common issues people had on platforms with missing or broken
libunwind.
* C++14 sized-deallocation is now supported (on gcc 5 and recent
clangs). It is off by default and can be enabled at configure time
via --enable-sized-delete. On GNU/Linux it can also be enabled at
run-time by either TCMALLOC_ENABLE_SIZED_DELETE environment variable
or by defining tcmalloc_sized_delete_enabled function which should
return 1 to enable it.
* we've lowered default value of transfer batch size to 512. Previous
value (bumped up in 2.1) was too high and caused performance
regression for some users. 512 should still give us performance
boost for workloads that need higher transfer batch size while not
penalizing other workloads too much.
* Brian Silverman's patch finally stopped arming profiling timer
unless profiling is started.
* Andrew Morrow has contributed support for obtaining cache size of the
current thread and softer idling (for use in MongoDB).
* we've implemented few minor performance improvements, particularly
on malloc fast-path.
* issue that caused spurious profiler_unittest.sh failures was fixed.