diff --git a/doc/configuration.txt b/doc/configuration.txt
index 4795dd21f..6660aa7b7 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -1070,6 +1070,7 @@ The following keywords are supported in the "global" section :
    - maxsslconn
    - maxsslrate
    - maxzlibmem
+   - no-memory-trimming
    - noepoll
    - nokqueue
    - noevports
@@ -2380,6 +2381,22 @@ maxzlibmem <number>
   with "show info" on the line "MaxZlibMemUsage", the memory used by zlib is
   "ZlibMemUsage" in bytes.
 
+no-memory-trimming
+  Disables memory trimming ("malloc_trim") at a few moments where attempts are
+  made to reclaim lots of memory (on memory shortage or on reload). Trimming
+  memory forces the system's allocator to scan all unused areas and to release
+  them. This is generally seen as nice action to leave more available memory to
+  a new process while the old one is unlikely to make significant use of it.
+  But some systems dealing with tens to hundreds of thousands of concurrent
+  connections may experience a lot of memory fragmentation, that may render
+  this release operation extremely long. During this time, no more traffic
+  passes through the process, new connections are not accepted anymore, some
+  health checks may even fail, and the watchdog may even trigger and kill the
+  unresponsive process, leaving a huge core dump. If this ever happens, then it
+  is suggested to use this option to disable trimming and stop trying to be
+  nice with the new process. Note that advanced memory allocators usually do
+  not suffer from such a problem.
+
 noepoll
   Disables the use of the "epoll" event polling system on Linux. It is
   equivalent to the command-line argument "-de". The next polling system
diff --git a/src/pool.c b/src/pool.c
index b3520d744..fe10badbd 100644
--- a/src/pool.c
+++ b/src/pool.c
@@ -83,6 +83,7 @@ static const struct {
 
 static int mem_fail_rate __read_mostly = 0;
 static int using_default_allocator __read_mostly = 1;
+static int disable_trim __read_mostly = 0;
 static int(*my_mallctl)(const char *, void *, size_t *, void *, size_t) = NULL;
 
 /* ask the allocator to trim memory pools.
@@ -95,6 +96,9 @@ static void trim_all_pools(void)
 {
 	int isolated = thread_isolated();
 
+	if (disable_trim)
+		return;
+
 	if (!isolated)
 		thread_isolate();
 
@@ -1073,9 +1077,21 @@ static int mem_parse_global_fail_alloc(char **args, int section_type, struct pro
 	return 0;
 }
 
+/* config parser for global "no-memory-trimming" */
+static int mem_parse_global_no_mem_trim(char **args, int section_type, struct proxy *curpx,
+                                       const struct proxy *defpx, const char *file, int line,
+                                       char **err)
+{
+	if (too_many_args(0, args, err, NULL))
+		return -1;
+	disable_trim = 1;
+	return 0;
+}
+
 /* register global config keywords */
 static struct cfg_kw_list mem_cfg_kws = {ILH, {
 	{ CFG_GLOBAL, "tune.fail-alloc", mem_parse_global_fail_alloc },
+	{ CFG_GLOBAL, "no-memory-trimming", mem_parse_global_no_mem_trim },
 	{ 0, NULL, NULL }
 }};