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Date:      Sat, 4 Mar 2017 12:05:46 +0000 (UTC)
From:      Andriy Gapon <avg@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org
Subject:   svn commit: r314663 - stable/11/sys/vm
Message-ID:  <201703041205.v24C5kGa047719@repo.freebsd.org>
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Author: avg
Date: Sat Mar  4 12:05:46 2017
New Revision: 314663
URL: https://svnweb.freebsd.org/changeset/base/314663

Log:
  MFC r314272: call vm_lowmem hook in uma_reclaim_worker

Modified:
  stable/11/sys/vm/uma_core.c
  stable/11/sys/vm/vm_kern.c
  stable/11/sys/vm/vm_pageout.c
  stable/11/sys/vm/vm_pageout.h
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/vm/uma_core.c
==============================================================================
--- stable/11/sys/vm/uma_core.c	Sat Mar  4 12:04:24 2017	(r314662)
+++ stable/11/sys/vm/uma_core.c	Sat Mar  4 12:05:46 2017	(r314663)
@@ -64,6 +64,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/bitset.h>
+#include <sys/eventhandler.h>
 #include <sys/kernel.h>
 #include <sys/types.h>
 #include <sys/queue.h>
@@ -3199,6 +3200,9 @@ uma_reclaim_worker(void *arg __unused)
 		    "umarcl", 0);
 		if (uma_reclaim_needed) {
 			uma_reclaim_needed = 0;
+			sx_xunlock(&uma_drain_lock);
+			EVENTHANDLER_INVOKE(vm_lowmem, VM_LOW_KMEM);
+			sx_xlock(&uma_drain_lock);
 			uma_reclaim_locked(true);
 		}
 	}

Modified: stable/11/sys/vm/vm_kern.c
==============================================================================
--- stable/11/sys/vm/vm_kern.c	Sat Mar  4 12:04:24 2017	(r314662)
+++ stable/11/sys/vm/vm_kern.c	Sat Mar  4 12:05:46 2017	(r314663)
@@ -549,11 +549,13 @@ debug_vm_lowmem(SYSCTL_HANDLER_ARGS)
 	error = sysctl_handle_int(oidp, &i, 0, req);
 	if (error)
 		return (error);
-	if (i)	 
-		EVENTHANDLER_INVOKE(vm_lowmem, 0);
+	if ((i & ~(VM_LOW_KMEM | VM_LOW_PAGES)) != 0)
+		return (EINVAL);
+	if (i != 0)
+		EVENTHANDLER_INVOKE(vm_lowmem, i);
 	return (0);
 }
 
 SYSCTL_PROC(_debug, OID_AUTO, vm_lowmem, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
-    debug_vm_lowmem, "I", "set to trigger vm_lowmem event");
+    debug_vm_lowmem, "I", "set to trigger vm_lowmem event with given flags");
 #endif

Modified: stable/11/sys/vm/vm_pageout.c
==============================================================================
--- stable/11/sys/vm/vm_pageout.c	Sat Mar  4 12:04:24 2017	(r314662)
+++ stable/11/sys/vm/vm_pageout.c	Sat Mar  4 12:05:46 2017	(r314663)
@@ -871,7 +871,7 @@ vm_pageout_scan(struct vm_domain *vmd, i
 		 * Decrease registered cache sizes.
 		 */
 		SDT_PROBE0(vm, , , vm__lowmem_scan);
-		EVENTHANDLER_INVOKE(vm_lowmem, 0);
+		EVENTHANDLER_INVOKE(vm_lowmem, VM_LOW_PAGES);
 		/*
 		 * We do this explicitly after the caches have been
 		 * drained above.

Modified: stable/11/sys/vm/vm_pageout.h
==============================================================================
--- stable/11/sys/vm/vm_pageout.h	Sat Mar  4 12:04:24 2017	(r314662)
+++ stable/11/sys/vm/vm_pageout.h	Sat Mar  4 12:05:46 2017	(r314663)
@@ -87,6 +87,12 @@ extern bool vm_pages_needed;
 #define	VM_OOM_SWAPZ	2
 
 /*
+ * vm_lowmem flags.
+ */
+#define	VM_LOW_KMEM	0x01
+#define	VM_LOW_PAGES	0x02
+
+/*
  *	Exported routines.
  */

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