Add DHAT as an experimental tool. DHAT (a Dynamic Heap Analysis Tool)

is a heap profiler that is complementary to Massif.  DHAT tracks heap
allocations, and connects which memory accesses are to which blocks.
It can find the following information:

* total allocation and max liveness

* average block lifetime (# instructions between allocation and
  freeing)

* average number of reads and writes to each byte in the block
  ("access ratios")

* average of longest interval of non-access to a block, also 
  measured in instructions

* which fields of blocks are used a lot, and which aren't
  (hot-field profiling)

Using these stats it is possible to identify allocation points with
the following characteristics:

* potential process-lifetime leaks (blocks allocated by the point just
  accumulate, and are freed only at the end of the run)

* excessive turnover: points which chew through a lot of heap, even if
  it is not held onto for very long

* excessively transient: points which allocate very short lived blocks

* useless or underused allocations: blocks which are allocated but not
  completely filled in, or are filled in but not subsequently read.

* blocks which see extended periods of inactivity.  Could these
  perhaps be allocated later or freed sooner?

* blocks with inefficient layout (hot fields spread out over
  multiple cache lines), or with alignment holes



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@11431 a5019735-40e9-0310-863c-91ae7b9d1cf9

1 files changed, 2 insertions, 0 deletions

diff --git a/configure.in b/configure.in
index 667ca243..88a9e106 100644
--- a/configure.in
+++ b/configure.in
@@ -1958,6 +1958,8 @@ AC_CONFIG_FILES([
    exp-bbv/tests/amd64-linux/Makefile
    exp-bbv/tests/ppc32-linux/Makefile
    exp-bbv/tests/arm-linux/Makefile
+   exp-dhat/Makefile
+   exp-dhat/tests/Makefile
 ])
 AC_CONFIG_FILES([coregrind/link_tool_exe_linux],
                 [chmod +x coregrind/link_tool_exe_linux])