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Add a debugging sysctl, debug.vm_lowmem, that when assigned a value of

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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
This commit is contained in:
Robert Watson 2009-02-23 23:00:12 +00:00
parent a714e55f73
commit 86f087370b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=188964
1 changed files with 22 additions and 0 deletions
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22
sys/vm/vm_kern.c
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@ -73,6 +73,7 @@ __FBSDID("$FreeBSD$");
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
@ -500,3 +501,24 @@ kmem_init(start, end)
/* ... and ending with the completion of the above `insert' */
vm_map_unlock(m);
}
/*
* Allow userspace to directly trigger the VM drain routine for testing
* purposes.
*/
static int
debug_vm_lowmem(SYSCTL_HANDLER_ARGS)
{
int error, i;
i = 0;
error = sysctl_handle_int(oidp, &i, 0, req);
if (error)
return (error);
if (i)
EVENTHANDLER_INVOKE(vm_lowmem, 0);
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");