[Python-checkins] cpython: Issue #26588: Optimize tracemalloc_realloc()

[victor.stinner]

https://hg.python.org/cpython/rev/dd887518b569
changeset:   100674:dd887518b569
user:        Victor Stinner <victor.stinner at gmail.com>
date:        Wed Mar 23 09:08:08 2016 +0100
summary:
  Issue #26588: Optimize tracemalloc_realloc()

No need to remove the old trace if the memory block didn't move.

files:
  Modules/_tracemalloc.c |  7 ++++++-
  1 files changed, 6 insertions(+), 1 deletions(-)


diff --git a/Modules/_tracemalloc.c b/Modules/_tracemalloc.c
--- a/Modules/_tracemalloc.c
+++ b/Modules/_tracemalloc.c
@@ -633,7 +633,12 @@
         /* an existing memory block has been resized */
 
         TABLES_LOCK();
-        REMOVE_TRACE(ptr);
+
+        /* tracemalloc_add_trace() updates the trace if there is already
+           a trace at address (domain, ptr2) */
+        if (ptr2 != ptr) {
+            REMOVE_TRACE(ptr);
+        }
 
         if (ADD_TRACE(ptr2, new_size) < 0) {
             /* Memory allocation failed. The error cannot be reported to

-- 
Repository URL: https://hg.python.org/cpython