Add a debugging sysctl, debug.vm_lowmem, that when assigned a value of
1 will trigger a pass through the VM's low-memory handlers, such as protocol and UMA drain routines. This makes it easier to exercise these otherwise rarely-invoked code paths. MFC after: 3 days
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=188964
@ -73,6 +73,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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@ -500,3 +501,24 @@ kmem_init(start, end)
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/* ... and ending with the completion of the above `insert' */
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vm_map_unlock(m);
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}
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/*
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* Allow userspace to directly trigger the VM drain routine for testing
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* purposes.
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*/
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static int
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debug_vm_lowmem(SYSCTL_HANDLER_ARGS)
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{
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int error, i;
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i = 0;
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error = sysctl_handle_int(oidp, &i, 0, req);
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if (error)
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return (error);
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if (i)
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EVENTHANDLER_INVOKE(vm_lowmem, 0);
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return (0);
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}
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SYSCTL_PROC(_debug, OID_AUTO, vm_lowmem, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
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debug_vm_lowmem, "I", "set to trigger vm_lowmem event");
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