Date: Mon, 23 Feb 2009 23:00:13 +0000 (UTC) From: Robert Watson <rwatson@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r188964 - head/sys/vm Message-ID: <200902232300.n1NN0Dwa042166@svn.freebsd.org>
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Author: rwatson Date: Mon Feb 23 23:00:12 2009 New Revision: 188964 URL: http://svn.freebsd.org/changeset/base/188964 Log: 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 Modified: head/sys/vm/vm_kern.c Modified: head/sys/vm/vm_kern.c ============================================================================== --- head/sys/vm/vm_kern.c Mon Feb 23 22:58:59 2009 (r188963) +++ head/sys/vm/vm_kern.c Mon Feb 23 23:00:12 2009 (r188964) @@ -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");
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