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78c85e8dfc
the raw values including for child process statistics and only compute the system and user timevals on demand. - Fix the various kern_wait() syscall wrappers to only pass in a rusage pointer if they are going to use the result. - Add a kern_getrusage() function for the ABI syscalls to use so that they don't have to play stackgap games to call getrusage(). - Fix the svr4_sys_times() syscall to just call calcru() to calculate the times it needs rather than calling getrusage() twice with associated stackgap, etc. - Add a new rusage_ext structure to store raw time stats such as tick counts for user, system, and interrupt time as well as a bintime of the total runtime. A new p_rux field in struct proc replaces the same inline fields from struct proc (i.e. p_[isu]ticks, p_[isu]u, and p_runtime). A new p_crux field in struct proc contains the "raw" child time usage statistics. ruadd() has been changed to handle adding the associated rusage_ext structures as well as the values in rusage. Effectively, the values in rusage_ext replace the ru_utime and ru_stime values in struct rusage. These two fields in struct rusage are no longer used in the kernel. - calcru() has been split into a static worker function calcru1() that calculates appropriate timevals for user and system time as well as updating the rux_[isu]u fields of a passed in rusage_ext structure. calcru() uses a copy of the process' p_rux structure to compute the timevals after updating the runtime appropriately if any of the threads in that process are currently executing. It also now only locks sched_lock internally while doing the rux_runtime fixup. calcru() now only requires the caller to hold the proc lock and calcru1() only requires the proc lock internally. calcru() also no longer allows callers to ask for an interrupt timeval since none of them actually did. - calcru() now correctly handles threads executing on other CPUs. - A new calccru() function computes the child system and user timevals by calling calcru1() on p_crux. Note that this means that any code that wants child times must now call this function rather than reading from p_cru directly. This function also requires the proc lock. - This finishes the locking for rusage and friends so some of the Giant locks in exit1() and kern_wait() are now gone. - The locking in ttyinfo() has been tweaked so that a shared lock of the proctree lock is used to protect the process group rather than the process group lock. By holding this lock until the end of the function we now ensure that the process/thread that we pick to dump info about will no longer vanish while we are trying to output its info to the console. Submitted by: bde (mostly) MFC after: 1 month
426 lines
12 KiB
C
426 lines
12 KiB
C
/*-
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* Copyright (c) 1994 Christopher G. Demetriou
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_acct.c 8.1 (Berkeley) 6/14/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sysproto.h>
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#include <sys/proc.h>
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#include <sys/mac.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/fcntl.h>
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#include <sys/syslog.h>
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#include <sys/kernel.h>
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#include <sys/sysent.h>
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#include <sys/sysctl.h>
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#include <sys/namei.h>
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#include <sys/acct.h>
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#include <sys/resourcevar.h>
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#include <sys/tty.h>
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/*
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* The routines implemented in this file are described in:
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* Leffler, et al.: The Design and Implementation of the 4.3BSD
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* UNIX Operating System (Addison Welley, 1989)
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* on pages 62-63.
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*
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* Arguably, to simplify accounting operations, this mechanism should
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* be replaced by one in which an accounting log file (similar to /dev/klog)
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* is read by a user process, etc. However, that has its own problems.
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*/
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/*
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* Internal accounting functions.
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* The former's operation is described in Leffler, et al., and the latter
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* was provided by UCB with the 4.4BSD-Lite release
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*/
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static comp_t encode_comp_t(u_long, u_long);
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static void acctwatch(void *);
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/*
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* Accounting callout used for periodic scheduling of acctwatch.
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*/
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static struct callout acctwatch_callout;
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/*
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* Accounting vnode pointer, saved vnode pointer, and flags for each.
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*/
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static struct vnode *acctp;
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static struct ucred *acctcred;
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static int acctflags;
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static struct vnode *savacctp;
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static struct ucred *savacctcred;
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static int savacctflags;
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static struct mtx acct_mtx;
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MTX_SYSINIT(acct, &acct_mtx, "accounting", MTX_DEF);
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/*
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* Values associated with enabling and disabling accounting
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*/
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static int acctsuspend = 2; /* stop accounting when < 2% free space left */
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SYSCTL_INT(_kern, OID_AUTO, acct_suspend, CTLFLAG_RW,
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&acctsuspend, 0, "percentage of free disk space below which accounting stops");
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static int acctresume = 4; /* resume when free space risen to > 4% */
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SYSCTL_INT(_kern, OID_AUTO, acct_resume, CTLFLAG_RW,
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&acctresume, 0, "percentage of free disk space above which accounting resumes");
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static int acctchkfreq = 15; /* frequency (in seconds) to check space */
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SYSCTL_INT(_kern, OID_AUTO, acct_chkfreq, CTLFLAG_RW,
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&acctchkfreq, 0, "frequency for checking the free space");
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/*
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* Accounting system call. Written based on the specification and
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* previous implementation done by Mark Tinguely.
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*
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* MPSAFE
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*/
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int
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acct(td, uap)
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struct thread *td;
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struct acct_args /* {
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char *path;
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} */ *uap;
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{
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struct nameidata nd;
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int error, flags;
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/* Make sure that the caller is root. */
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error = suser(td);
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if (error)
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return (error);
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mtx_lock(&Giant);
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/*
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* If accounting is to be started to a file, open that file for
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* appending and make sure it's a 'normal'.
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*/
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if (uap->path != NULL) {
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NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, td);
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flags = FWRITE | O_APPEND;
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error = vn_open(&nd, &flags, 0, -1);
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if (error)
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goto done2;
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NDFREE(&nd, NDF_ONLY_PNBUF);
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#ifdef MAC
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error = mac_check_system_acct(td->td_ucred, nd.ni_vp);
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if (error) {
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vn_close(nd.ni_vp, flags, td->td_ucred, td);
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goto done2;
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}
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#endif
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VOP_UNLOCK(nd.ni_vp, 0, td);
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if (nd.ni_vp->v_type != VREG) {
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vn_close(nd.ni_vp, flags, td->td_ucred, td);
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error = EACCES;
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goto done2;
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}
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#ifdef MAC
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} else {
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error = mac_check_system_acct(td->td_ucred, NULL);
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if (error)
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goto done2;
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#endif
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}
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mtx_lock(&acct_mtx);
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/*
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* If accounting was previously enabled, kill the old space-watcher,
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* close the file, and (if no new file was specified, leave).
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*
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* XXX arr: should not hold lock over vnode operation.
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*/
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if (acctp != NULLVP || savacctp != NULLVP) {
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callout_stop(&acctwatch_callout);
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error = vn_close((acctp != NULLVP ? acctp : savacctp),
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(acctp != NULLVP ? acctflags : savacctflags),
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(acctcred != NOCRED ? acctcred : savacctcred), td);
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acctp = savacctp = NULLVP;
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crfree(acctcred != NOCRED ? acctcred : savacctcred);
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acctcred = savacctcred = NOCRED;
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log(LOG_NOTICE, "Accounting disabled\n");
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}
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if (uap->path == NULL) {
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mtx_unlock(&acct_mtx);
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goto done2;
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}
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/*
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* Save the new accounting file vnode, and schedule the new
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* free space watcher.
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*/
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acctp = nd.ni_vp;
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acctcred = crhold(td->td_ucred);
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acctflags = flags;
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callout_init(&acctwatch_callout, 0);
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mtx_unlock(&acct_mtx);
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log(LOG_NOTICE, "Accounting enabled\n");
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acctwatch(NULL);
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done2:
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mtx_unlock(&Giant);
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return (error);
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}
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/*
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* Write out process accounting information, on process exit.
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* Data to be written out is specified in Leffler, et al.
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* and are enumerated below. (They're also noted in the system
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* "acct.h" header file.)
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*/
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int
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acct_process(td)
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struct thread *td;
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{
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struct acct acct;
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struct timeval ut, st, tmp;
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struct plimit *newlim, *oldlim;
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struct proc *p;
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struct rusage *r;
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struct ucred *uc;
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struct vnode *vp;
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int t, ret;
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mtx_lock(&acct_mtx);
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/* If accounting isn't enabled, don't bother */
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vp = acctp;
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if (vp == NULLVP) {
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mtx_unlock(&acct_mtx);
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return (0);
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}
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p = td->td_proc;
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/*
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* Get process accounting information.
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*/
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PROC_LOCK(p);
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/* (1) The name of the command that ran */
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bcopy(p->p_comm, acct.ac_comm, sizeof acct.ac_comm);
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/* (2) The amount of user and system time that was used */
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calcru(p, &ut, &st);
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acct.ac_utime = encode_comp_t(ut.tv_sec, ut.tv_usec);
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acct.ac_stime = encode_comp_t(st.tv_sec, st.tv_usec);
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/* (3) The elapsed time the command ran (and its starting time) */
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tmp = boottime;
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timevaladd(&tmp, &p->p_stats->p_start);
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acct.ac_btime = tmp.tv_sec;
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microuptime(&tmp);
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timevalsub(&tmp, &p->p_stats->p_start);
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acct.ac_etime = encode_comp_t(tmp.tv_sec, tmp.tv_usec);
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/* (4) The average amount of memory used */
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r = &p->p_stats->p_ru;
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tmp = ut;
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timevaladd(&tmp, &st);
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t = tmp.tv_sec * hz + tmp.tv_usec / tick;
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if (t)
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acct.ac_mem = (r->ru_ixrss + r->ru_idrss + r->ru_isrss) / t;
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else
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acct.ac_mem = 0;
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/* (5) The number of disk I/O operations done */
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acct.ac_io = encode_comp_t(r->ru_inblock + r->ru_oublock, 0);
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/* (6) The UID and GID of the process */
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acct.ac_uid = p->p_ucred->cr_ruid;
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acct.ac_gid = p->p_ucred->cr_rgid;
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/* (7) The terminal from which the process was started */
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SESS_LOCK(p->p_session);
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if ((p->p_flag & P_CONTROLT) && p->p_pgrp->pg_session->s_ttyp)
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acct.ac_tty = dev2udev(p->p_pgrp->pg_session->s_ttyp->t_dev);
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else
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acct.ac_tty = NODEV;
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SESS_UNLOCK(p->p_session);
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/* (8) The boolean flags that tell how the process terminated, etc. */
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acct.ac_flag = p->p_acflag;
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PROC_UNLOCK(p);
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/*
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* Finish doing things that require acct_mtx, and release acct_mtx.
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*/
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uc = crhold(acctcred);
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vref(vp);
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mtx_unlock(&acct_mtx);
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/*
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* Eliminate any file size rlimit.
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*/
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newlim = lim_alloc();
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PROC_LOCK(p);
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oldlim = p->p_limit;
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lim_copy(newlim, oldlim);
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newlim->pl_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
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p->p_limit = newlim;
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PROC_UNLOCK(p);
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lim_free(oldlim);
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/*
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* Write the accounting information to the file.
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*/
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VOP_LEASE(vp, td, uc, LEASE_WRITE);
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ret = vn_rdwr(UIO_WRITE, vp, (caddr_t)&acct, sizeof (acct),
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(off_t)0, UIO_SYSSPACE, IO_APPEND|IO_UNIT, uc, NOCRED,
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(int *)0, td);
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vrele(vp);
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crfree(uc);
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return (ret);
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}
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/*
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* Encode_comp_t converts from ticks in seconds and microseconds
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* to ticks in 1/AHZ seconds. The encoding is described in
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* Leffler, et al., on page 63.
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*/
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#define MANTSIZE 13 /* 13 bit mantissa. */
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#define EXPSIZE 3 /* Base 8 (3 bit) exponent. */
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#define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */
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static comp_t
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encode_comp_t(s, us)
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u_long s, us;
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{
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int exp, rnd;
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exp = 0;
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rnd = 0;
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s *= AHZ;
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s += us / (1000000 / AHZ); /* Maximize precision. */
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while (s > MAXFRACT) {
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rnd = s & (1 << (EXPSIZE - 1)); /* Round up? */
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s >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */
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exp++;
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}
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/* If we need to round up, do it (and handle overflow correctly). */
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if (rnd && (++s > MAXFRACT)) {
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s >>= EXPSIZE;
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exp++;
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}
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/* Clean it up and polish it off. */
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exp <<= MANTSIZE; /* Shift the exponent into place */
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exp += s; /* and add on the mantissa. */
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return (exp);
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}
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/*
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* Periodically check the filesystem to see if accounting
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* should be turned on or off. Beware the case where the vnode
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* has been vgone()'d out from underneath us, e.g. when the file
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* system containing the accounting file has been forcibly unmounted.
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*/
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/* ARGSUSED */
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static void
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acctwatch(a)
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void *a;
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{
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struct statfs sb;
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mtx_lock(&acct_mtx);
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/*
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* XXX arr: need to fix the issue of holding acct_mtx over
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* the below vnode operations.
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*/
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if (savacctp != NULLVP) {
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if (savacctp->v_type == VBAD) {
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(void) vn_close(savacctp, savacctflags, savacctcred,
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NULL);
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savacctp = NULLVP;
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savacctcred = NOCRED;
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mtx_unlock(&acct_mtx);
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return;
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}
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(void)VFS_STATFS(savacctp->v_mount, &sb, (struct thread *)0);
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if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
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acctp = savacctp;
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acctcred = savacctcred;
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acctflags = savacctflags;
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savacctp = NULLVP;
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savacctcred = NOCRED;
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log(LOG_NOTICE, "Accounting resumed\n");
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}
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} else {
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if (acctp == NULLVP) {
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mtx_unlock(&acct_mtx);
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return;
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}
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if (acctp->v_type == VBAD) {
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(void) vn_close(acctp, acctflags, acctcred, NULL);
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acctp = NULLVP;
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crfree(acctcred);
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acctcred = NOCRED;
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mtx_unlock(&acct_mtx);
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return;
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}
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(void)VFS_STATFS(acctp->v_mount, &sb, (struct thread *)0);
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if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
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savacctp = acctp;
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savacctflags = acctflags;
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savacctcred = acctcred;
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acctp = NULLVP;
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acctcred = NOCRED;
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log(LOG_NOTICE, "Accounting suspended\n");
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}
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}
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callout_reset(&acctwatch_callout, acctchkfreq * hz, acctwatch, NULL);
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mtx_unlock(&acct_mtx);
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}
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