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Index: vm_glue.c
===================================================================
--- vm_glue.c
+++ vm_glue.c
@@ -842,6 +842,15 @@
SYSCTL_INT(_vm, OID_AUTO, swap_idle_threshold2, CTLFLAG_RW,
&swap_idle_threshold2, 0, "Time before a process will be swapped out");
+/* Long before Unix supported paging, it used process swapping.
+ * While this was ok with the PDP-11/20's 64kB address spaces, it does not work as well today
+ * when address spaces can easily be hundreds of GB.*/
+
+static u_long proc_swapout_max = 65536 ;
+SYSCTL_LONG(_vm, OID_AUTO, proc_swapout_max, CTLFLAG_RW, &proc_swapout_max, 0,
+ "Allows to limit the swapout of whole processes which max resident size (in bytes) is equal or less than value");
+
+
/*
* First, if any processes have been sleeping or stopped for at least
* "swap_idle_threshold1" seconds, they are swapped out. If, however,
@@ -982,11 +991,14 @@
/*
* If the pageout daemon didn't free enough pages,
* or if this process is idle and the system is
- * configured to swap proactively, swap it out.
+ * configured to swap proactively, and the process resident count
+ * is less than vm.proc_swapout_max swap it out.
*/
- if ((action & VM_SWAP_NORMAL) ||
+ if (((vmspace_resident_count(p->p_vmspace) * PAGE_SIZE)
+ <= proc_swapout_max ) &&
+ ((action & VM_SWAP_NORMAL) ||
((action & VM_SWAP_IDLE) &&
- (minslptime > swap_idle_threshold2))) {
+ (minslptime > swap_idle_threshold2)))) {
_PRELE(p);
if (swapout(p) == 0)
didswap++;
@@ -995,6 +1007,7 @@
vmspace_free(vm);
goto retry;
}
+
}
nextproc:
PROC_UNLOCK(p);
@@ -1044,6 +1057,8 @@
p->p_flag |= P_INMEM;
}
+
+
static int
swapout(p)
struct proc *p;

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