commit 42bcf37fcffa65592e401c43aa8c0190452b28b0
author Victor Stinner <victor.stinner@gmail.com> Wed Mar 23 09:08:08 2016 +0100
committer Victor Stinner <victor.stinner@gmail.com> Wed Mar 23 09:08:08 2016 +0100
tree 8daf6bd5c396224c5f7000fa5937ff6d8f7e9b06
parent d65e0c7560f8a5ad31d31892cee6f1416293ca39

Issue #26588: Optimize tracemalloc_realloc()

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

Modules/_tracemalloc.c

diff --git a/Modules/_tracemalloc.c b/Modules/_tracemalloc.c
index 3d96860..139b169 100644
--- 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