[PATCH] Add malloc micro benchmark

[Carlos O'Donell]

On 2/1/19 11:27 AM, Wilco Dijkstra wrote:
> Add a malloc micro benchmark to enable accurate testing of the
> various paths in malloc and free.  The benchmark does a varying
> number of allocations of a given block size, then frees them again.
> 
> It tests 3 different scenarios: single-threaded using main arena,
> multi-threaded using thread-arena, main arena with SINGLE_THREAD_P
> false.
> 
> OK for commit?
> 
> ChangeLog:
> 2019-02-01  Wilco Dijkstra  <wdijkstr@arm.com>
> 
> 	* benchtests/Makefile: Add malloc-simple benchmark.
> 	* benchtests/bench-malloc-simple.c: New benchmark.

This broke Fedora Rawhide during CI testing:

BUILDSTDERR: bench-malloc-simple.c: In function 'bench':
BUILDSTDERR: bench-malloc-simple.c:89:17: error: variable 'res' set but not used [-Werror=unused-but-set-variable]
BUILDSTDERR:    89 |   unsigned long res;
BUILDSTDERR:       |                 ^~~
BUILDSTDERR: cc1: all warnings being treated as errors

Affects aarch64, armv7hl, and s390x.

I assume we need a "(void) res" like we have in bench-malloc-thread.c?

I'm going to checkin a quick fix to Rawhide and report back if anything
else breaks.

-- 
Cheers,
Carlos.