Revert the following fix temporarily:

commit c26efef9798914e208329c0e8c3c73bb1135d9e3

Author: Mel Gorman <mgorman@suse.de>

Date:   Thu Apr 2 12:14:14 2015 +0530

    malloc: Consistently apply trim_threshold to all heaps [BZ #17195]

because it makes an openjdk bug (#1209451) more prominent, crashing java

commands.

diff --git a/malloc/arena.c b/malloc/arena.c

index 8af51f0..d85f371 100644

--- a/malloc/arena.c

+++ b/malloc/arena.c

@@ -658,7 +658,7 @@ heap_trim (heap_info *heap, size_t pad)

   unsigned long pagesz = GLRO (dl_pagesize);

   mchunkptr top_chunk = top (ar_ptr), p, bck, fwd;

   heap_info *prev_heap;

-  long new_size, top_size, extra, prev_size, misalign;

+  long new_size, top_size, top_area, extra, prev_size, misalign;

   /* Can this heap go away completely? */

   while (top_chunk == chunk_at_offset (heap, sizeof (*heap)))

@@ -694,9 +694,16 @@ heap_trim (heap_info *heap, size_t pad)

       set_head (top_chunk, new_size | PREV_INUSE);

       /*check_chunk(ar_ptr, top_chunk);*/

     }

+

+  /* Uses similar logic for per-thread arenas as the main arena with systrim

+     by preserving the top pad and at least a page.  */

   top_size = chunksize (top_chunk);

-  extra = (top_size - pad - MINSIZE - 1) & ~(pagesz - 1);

-  if (extra < (long) pagesz)

+  top_area = top_size - MINSIZE - 1;

+  if (top_area <= pad)

+    return 0;

+

+  extra = ALIGN_DOWN(top_area - pad, pagesz);

+  if ((unsigned long) extra < mp_.trim_threshold)

     return 0;

   /* Try to shrink. */