From 89619b747bcff379dca98e975a98865a45366417 Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sun, 4 Apr 2021 19:28:14 +0300
Subject: [PATCH] Add sysctl debug.uma_reclaim

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
---
 sys/vm/vm_kern.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/sys/vm/vm_kern.c b/sys/vm/vm_kern.c
index f767f01acaa..77d9a410586 100644
--- a/sys/vm/vm_kern.c
+++ b/sys/vm/vm_kern.c
@@ -903,3 +903,23 @@ debug_vm_lowmem(SYSCTL_HANDLER_ARGS)
 SYSCTL_PROC(_debug, OID_AUTO, vm_lowmem,
     CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, 0, debug_vm_lowmem, "I",
     "set to trigger vm_lowmem event with given flags");
+
+static int
+debug_uma_reclaim(SYSCTL_HANDLER_ARGS)
+{
+	int error, i;
+
+	i = 0;
+	error = sysctl_handle_int(oidp, &i, 0, req);
+	if (error != 0)
+		return (error);
+	if (i != UMA_RECLAIM_TRIM && i != UMA_RECLAIM_DRAIN &&
+	    i != UMA_RECLAIM_DRAIN_CPU)
+		return (EINVAL);
+	uma_reclaim(i);
+	return (0);
+}
+
+SYSCTL_PROC(_debug, OID_AUTO, uma_reclaim,
+    CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, 0, debug_uma_reclaim, "I",
+    "set to generate request to reclaim uma caches");