osd/: optionally track every pg ref

This involves three pieces:

For intrusive_ptr type references, we use TrackedIntPtr instead.  This
uses get_with_id and put_with_id to associate an id and backtrace with
each particular ref instance.

For refs taken via direct calls to get() and put(), get and put now
require a tag string.  The PG tracks individual ref counts for each tag
as well as the total.

Finally, PGs register/unregister themselves on construction/destruction
with OSDService.

As a result, on shutdown, we can check for live pgs and determine where
the references are held.

This behavior is compiled out by default, but can be included with the
--enable-pgrefdebugging flag.

Signed-off-by: Samuel Just <sam.just@inktank.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 23e21133e6a..2661d1c456e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -268,6 +268,12 @@ AS_IF([test "x$with_tcmalloc" != xno],
 		  [no tcmalloc found (use --without-tcmalloc to disable)])])])
 AM_CONDITIONAL(WITH_TCMALLOC, [test "$HAVE_LIBTCMALLOC" = "1"])
 
+#set pg ref debugging?
+AC_ARG_ENABLE([pgrefdebugging],
+	    [AS_HELP_STRING([--enable-pgrefdebugging], [enable pg ref debugging])],
+			[AC_DEFINE([PG_DEBUG_REFS], [1], [Defined if you want pg ref debugging])],
+			[])
+
 #
 # Java is painful
 #   - adapted from OMPI wrappers package