From: Victor Stinner <victor.stinner@gmail.com>
Date: Wed, 23 Mar 2016 08:08:08 +0000 (+0100)
Subject: Issue #26588: Optimize tracemalloc_realloc()
X-Git-Tag: v3.6.0a1~389
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=42bcf37fcffa65592e401c43aa8c0190452b28b0;p=python

Issue #26588: Optimize tracemalloc_realloc()

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

diff --git a/Modules/_tracemalloc.c b/Modules/_tracemalloc.c
index 3d96860f53..139b16963c 100644
--- a/Modules/_tracemalloc.c
+++ b/Modules/_tracemalloc.c
@@ -633,7 +633,12 @@ tracemalloc_realloc(void *ctx, void *ptr, size_t new_size)
         /* 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