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Index: sys/compat/linuxkpi/common/include/linux/swap.h
===================================================================
--- /dev/null
+++ sys/compat/linuxkpi/common/include/linux/swap.h
@@ -0,0 +1,51 @@
+/*-
+ * Copyright (c) 2018 Intel Corporation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _LINUX_SWAP_H_
+#define _LINUX_SWAP_H_
+
+#include <vm/swap_pager.h>
+#include <vm/vm_pageout.h>
+
+static inline long
+get_nr_swap_pages(void)
+{
+ int i, j;
+
+ /* NB: This could be done cheaply by obtaining swap_total directly */
+ swap_pager_status(&i, &j);
+ return i - j;
+}
+
+static inline int
+current_is_kswapd(void)
+{
+ return vm_curproc_is_vmproc();
+}
+
+#endif
Index: sys/vm/vm_pageout.h
===================================================================
--- sys/vm/vm_pageout.h
+++ sys/vm/vm_pageout.h
@@ -106,5 +106,8 @@
void vm_swapout_run(void);
void vm_swapout_run_idle(void);
+
+bool vm_curproc_is_vmproc(void);
+
#endif /* _KERNEL */
#endif /* _VM_VM_PAGEOUT_H_ */
Index: sys/vm/vm_swapout.c
===================================================================
--- sys/vm/vm_swapout.c
+++ sys/vm/vm_swapout.c
@@ -961,3 +961,10 @@
p->p_swtick = ticks;
return (0);
}
+
+/* Used to determine if the current process is itself the reaper. */
+bool
+vm_curproc_is_vmproc(void)
+{
+ return curproc == vmproc;
+}

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