/*- * Copyright (c) 1980, 1986, 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * 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. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * @(#)param.c 8.3 (Berkeley) 8/20/94 */ #include __FBSDID("$FreeBSD$"); #include "opt_param.h" #include "opt_maxusers.h" #include #include #include #include #include #include /* * System parameter formulae. */ #ifndef HZ # if defined(__amd64__) || defined(__i386__) || defined(__ia64__) || defined(__sparc64__) # define HZ 1000 # else # define HZ 100 # endif # ifndef HZ_VM # define HZ_VM 100 # endif #else # ifndef HZ_VM # define HZ_VM HZ # endif #endif #define NPROC (20 + 16 * maxusers) #ifndef NBUF #define NBUF 0 #endif #ifndef MAXFILES #define MAXFILES (maxproc * 2) #endif static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS); int hz; int tick; int maxusers; /* base tunable */ int maxproc; /* maximum # of processes */ int maxprocperuid; /* max # of procs per user */ int maxfiles; /* sys. wide open files limit */ int maxfilesperproc; /* per-proc open files limit */ int ncallout; /* maximum # of timer events */ int nbuf; int ngroups_max; /* max # groups per process */ int nswbuf; long maxswzone; /* max swmeta KVA storage */ long maxbcache; /* max buffer cache KVA storage */ long maxpipekva; /* Limit on pipe KVA */ int vm_guest; /* Running as virtual machine guest? */ u_long maxtsiz; /* max text size */ u_long dfldsiz; /* initial data size limit */ u_long maxdsiz; /* max data size */ u_long dflssiz; /* initial stack size limit */ u_long maxssiz; /* max stack size */ u_long sgrowsiz; /* amount to grow stack */ SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, "Number of clock ticks per second"); SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0, "Number of pre-allocated timer events"); SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0, "Number of buffers in the buffer cache"); SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0, "Number of swap buffers"); SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0, "Maximum memory for swap metadata"); SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0, "Maximum value of vfs.maxbufspace"); SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0, "Maximum text size"); SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0, "Initial data size limit"); SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0, "Maximum data size"); SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0, "Initial stack size limit"); SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0, "Maximum stack size"); SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0, "Amount to grow stack on a stack fault"); SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, NULL, 0, sysctl_kern_vm_guest, "A", "Virtual machine guest detected? (none|generic|xen)"); /* * These have to be allocated somewhere; allocating * them here forces loader errors if this file is omitted * (if they've been externed everywhere else; hah!). */ struct buf *swbuf; /* * The elements of this array are ordered based upon the values of the * corresponding enum VM_GUEST members. */ static const char *const vm_guest_sysctl_names[] = { "none", "generic", "xen", NULL }; #ifndef XEN static const char *const vm_bnames[] = { "QEMU", /* QEMU */ "Plex86", /* Plex86 */ "Bochs", /* Bochs */ NULL }; static const char *const vm_pnames[] = { "VMware Virtual Platform", /* VMWare VM */ "Virtual Machine", /* Microsoft VirtualPC */ "VirtualBox", /* Sun xVM VirtualBox */ "Parallels Virtual Platform", /* Parallels VM */ NULL }; /* * Detect known Virtual Machine hosts by inspecting the emulated BIOS. */ static enum VM_GUEST detect_virtual(void) { char *sysenv; int i; sysenv = getenv("smbios.bios.vendor"); if (sysenv != NULL) { for (i = 0; vm_bnames[i] != NULL; i++) if (strcmp(sysenv, vm_bnames[i]) == 0) { freeenv(sysenv); return (VM_GUEST_VM); } freeenv(sysenv); } sysenv = getenv("smbios.system.product"); if (sysenv != NULL) { for (i = 0; vm_pnames[i] != NULL; i++) if (strcmp(sysenv, vm_pnames[i]) == 0) { freeenv(sysenv); return (VM_GUEST_VM); } freeenv(sysenv); } return (VM_GUEST_NO); } #endif /* * Boot time overrides that are not scaled against main memory */ void init_param1(void) { #ifndef XEN vm_guest = detect_virtual(); #else vm_guest = VM_GUEST_XEN; #endif hz = -1; TUNABLE_INT_FETCH("kern.hz", &hz); if (hz == -1) hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ; tick = 1000000 / hz; #ifdef VM_SWZONE_SIZE_MAX maxswzone = VM_SWZONE_SIZE_MAX; #endif TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone); #ifdef VM_BCACHE_SIZE_MAX maxbcache = VM_BCACHE_SIZE_MAX; #endif TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache); maxtsiz = MAXTSIZ; TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz); dfldsiz = DFLDSIZ; TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz); maxdsiz = MAXDSIZ; TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz); dflssiz = DFLSSIZ; TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz); maxssiz = MAXSSIZ; TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz); sgrowsiz = SGROWSIZ; TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz); /* * Let the administrator set {NGROUPS_MAX}, but disallow values * less than NGROUPS_MAX which would violate POSIX.1-2008 or * greater than INT_MAX-1 which would result in overflow. */ ngroups_max = NGROUPS_MAX; TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max); if (ngroups_max < NGROUPS_MAX) ngroups_max = NGROUPS_MAX; } /* * Boot time overrides that are scaled against main memory */ void init_param2(long physpages) { /* Base parameters */ maxusers = MAXUSERS; TUNABLE_INT_FETCH("kern.maxusers", &maxusers); if (maxusers == 0) { maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE); if (maxusers < 32) maxusers = 32; if (maxusers > 384) maxusers = 384; } /* * The following can be overridden after boot via sysctl. Note: * unless overriden, these macros are ultimately based on maxusers. */ maxproc = NPROC; TUNABLE_INT_FETCH("kern.maxproc", &maxproc); /* * Limit maxproc so that kmap entries cannot be exhausted by * processes. */ if (maxproc > (physpages / 12)) maxproc = physpages / 12; maxfiles = MAXFILES; TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles); maxprocperuid = (maxproc * 9) / 10; maxfilesperproc = (maxfiles * 9) / 10; /* * Cannot be changed after boot. */ nbuf = NBUF; TUNABLE_INT_FETCH("kern.nbuf", &nbuf); ncallout = 16 + maxproc + maxfiles; TUNABLE_INT_FETCH("kern.ncallout", &ncallout); } /* * Boot time overrides that are scaled against the kmem map */ void init_param3(long kmempages) { /* * The default for maxpipekva is max(5% of the kmem map, 512KB). * See sys_pipe.c for more details. */ maxpipekva = (kmempages / 20) * PAGE_SIZE; if (maxpipekva < 512 * 1024) maxpipekva = 512 * 1024; TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva); } /* * Sysctl stringiying handler for kern.vm_guest. */ static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS) { return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], strlen(vm_guest_sysctl_names[vm_guest]))); }