1 /* Get the system load averages.
2 Copyright (C) 1985, 86, 87, 88, 89, 91, 92, 93
3 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
19 /* Compile-time symbols that this file uses:
21 FIXUP_KERNEL_SYMBOL_ADDR() Adjust address in returned struct nlist.
22 KERNEL_FILE Pathname of the kernel to nlist.
23 LDAV_CVT() Scale the load average from the kernel.
25 LDAV_SYMBOL Name of kernel symbol giving load average.
26 LOAD_AVE_TYPE Type of the load average array in the kernel.
27 Must be defined unless one of
28 apollo, DGUX, NeXT, or UMAX is defined;
29 otherwise, no load average is available.
30 NLIST_STRUCT Include nlist.h, not a.out.h, and
31 the nlist n_name element is a pointer,
33 NLIST_NAME_UNION struct nlist has an n_un member, not n_name.
34 LINUX_LDAV_FILE [__linux__]: File containing load averages.
36 Specific system predefines this file uses, aside from setting
37 default values if not emacs:
40 BSD Real BSD, not just BSD-like.
42 eunice UNIX emulator under VMS.
46 sequent Sequent Dynix 3.x.x (BSD)
47 _SEQUENT_ Sequent DYNIX/ptx 1.x.x (SYSV)
48 sony_news NEWS-OS (works at least for 4.1C)
52 __linux__ Linux: assumes /proc filesystem mounted.
53 Support from Michael K. Johnson.
55 In addition, to avoid nesting many #ifdefs, we internally set
56 LDAV_DONE to indicate that the load average has been computed.
58 We also #define LDAV_PRIVILEGED if a program will require
59 special installation to be able to call getloadavg. */
61 #include <sys/types.h>
63 /* Both the Emacs and non-Emacs sections want this. Some
64 configuration files' definitions for the LOAD_AVE_CVT macro (like
65 sparc.h's) use macros like FSCALE, defined here. */
67 #include <sys/param.h>
76 /* Exclude all the code except the test program at the end
77 if the system has its own `getloadavg' function. */
79 #ifndef HAVE_GETLOADAVG
82 /* The existing Emacs configuration files define a macro called
83 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
84 returns the load average multiplied by 100. What we actually want
85 is a macro called LDAV_CVT, which returns the load average as an
88 For backwards compatibility, we'll define LDAV_CVT in terms of
89 LOAD_AVE_CVT, but future machine config files should just define
92 #if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
93 #define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
96 #if !defined (BSD) && defined (ultrix)
97 /* Ultrix behaves like BSD on Vaxen. */
102 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
103 conflicts with the definition understood in this file, that this
107 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
108 defined to mean that the nlist method should be used, which is not true. */
112 /* Set values that are different from the defaults, which are
113 set a little farther down with #ifndef. */
116 /* Some shorthands. */
118 #if defined (HPUX) && !defined (hpux)
122 #if defined(hp300) && !defined(hpux)
126 #if defined(ultrix) && defined(mips)
130 #if defined(sun) && defined(SVR4)
134 #if defined (__osf__) && (defined (__alpha) || defined (__alpha__))
138 #if defined (__osf__) && (defined (mips) || defined (__mips__))
140 #include <sys/table.h>
143 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
144 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
145 that with a couple of other things and we'll have a unique match. */
146 #if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
147 #define tek4300 /* Define by emacs, but not by other users. */
151 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
152 #ifndef LOAD_AVE_TYPE
155 #define LOAD_AVE_TYPE long
159 #define LOAD_AVE_TYPE long
163 #define LOAD_AVE_TYPE long
167 #define LOAD_AVE_TYPE long
171 #define LOAD_AVE_TYPE long
175 #define LOAD_AVE_TYPE long
179 #define LOAD_AVE_TYPE long
183 #define LOAD_AVE_TYPE long
187 #define LOAD_AVE_TYPE long
190 #if defined (ardent) && defined (titan)
191 #define LOAD_AVE_TYPE long
195 #define LOAD_AVE_TYPE long
198 #endif /* No LOAD_AVE_TYPE. */
201 /* <sys/param.h> defines an incorrect value for FSCALE on Alpha OSF/1,
202 according to ghazi@noc.rutgers.edu. */
204 #define FSCALE 1024.0
210 /* SunOS and some others define FSCALE in sys/param.h. */
213 #define FSCALE 2048.0
216 #if defined(MIPS) || defined(SVR4) || defined(decstation)
220 #if defined (sgi) || defined (sequent)
221 /* Sometimes both MIPS and sgi are defined, so FSCALE was just defined
222 above under #ifdef MIPS. But we want the sgi value. */
224 #define FSCALE 1000.0
227 #if defined (ardent) && defined (titan)
228 #define FSCALE 65536.0
235 #endif /* Not FSCALE. */
237 #if !defined (LDAV_CVT) && defined (FSCALE)
238 #define LDAV_CVT(n) (((double) (n)) / FSCALE)
241 /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */
260 #if defined (_SEQUENT_) || defined (sequent)
280 #if defined (ardent) && defined (titan)
292 #endif /* defined (NLIST_STRUCT) */
295 #if defined(sgi) || (defined(mips) && !defined(BSD))
296 #define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
300 #if !defined (KERNEL_FILE) && defined (sequent)
301 #define KERNEL_FILE "/dynix"
304 #if !defined (KERNEL_FILE) && defined (hpux)
305 #define KERNEL_FILE "/hp-ux"
308 #if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan)))
309 #define KERNEL_FILE "/unix"
313 #if !defined (LDAV_SYMBOL) && defined (alliant)
314 #define LDAV_SYMBOL "_Loadavg"
317 #if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)))
318 #define LDAV_SYMBOL "avenrun"
332 /* LOAD_AVE_TYPE should only get defined if we're going to use the
334 #if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL))
335 #define LOAD_AVE_TYPE double
343 #else /* NLIST_STRUCT */
345 #endif /* NLIST_STRUCT */
353 #define KERNEL_FILE "/vmunix"
354 #endif /* KERNEL_FILE */
357 #define LDAV_SYMBOL "_avenrun"
358 #endif /* LDAV_SYMBOL */
366 #include <vms/iodef.h>
371 #define LDAV_CVT(n) ((double) (n))
372 #endif /* !LDAV_CVT */
374 #endif /* LOAD_AVE_TYPE */
377 #ifdef HAVE_MACH_MACH_H
378 #include <mach/mach.h>
385 #include <sys/sysmp.h>
391 #include <sys/time.h>
392 #include <sys/wait.h>
393 #include <sys/syscall.h>
396 #include <machine/cpu.h>
397 #include <inq_stats/statistics.h>
398 #include <inq_stats/sysstats.h>
399 #include <inq_stats/cpustats.h>
400 #include <inq_stats/procstats.h>
401 #else /* Not UMAX_43. */
402 #include <sys/sysdefs.h>
403 #include <sys/statistics.h>
404 #include <sys/sysstats.h>
405 #include <sys/cpudefs.h>
406 #include <sys/cpustats.h>
407 #include <sys/procstats.h>
408 #endif /* Not UMAX_43. */
412 #include <sys/dg_sys_info.h>
415 #if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
418 #include <sys/file.h>
421 /* Avoid static vars inside a function since in HPUX they dump as pure. */
424 static processor_set_t default_set
;
425 static int getloadavg_initialized
;
429 static unsigned int cpus
= 0;
430 static unsigned int samples
;
434 static struct dg_sys_info_load_info load_info
; /* what-a-mouthful! */
438 /* File descriptor open to /dev/kmem or VMS load ave driver. */
440 /* Nonzero iff channel is valid. */
441 static int getloadavg_initialized
;
442 /* Offset in kmem to seek to read load average, or 0 means invalid. */
445 #if !defined(VMS) && !defined(sgi)
446 static struct nlist nl
[2];
447 #endif /* Not VMS or sgi */
453 #endif /* LOAD_AVE_TYPE */
455 /* Put the 1 minute, 5 minute and 15 minute load averages
456 into the first NELEM elements of LOADAVG.
457 Return the number written (never more than 3, but may be less than NELEM),
458 or -1 if an error occurred. */
461 getloadavg (loadavg
, nelem
)
465 int elem
= 0; /* Return value. */
467 #ifdef NO_GET_LOAD_AVG
469 /* Set errno to zero to indicate that there was no particular error;
470 this function just can't work at all on this system. */
475 #if !defined (LDAV_DONE) && defined (__linux__)
479 #ifndef LINUX_LDAV_FILE
480 #define LINUX_LDAV_FILE "/proc/loadavg"
487 fd
= open (LINUX_LDAV_FILE
, O_RDONLY
);
490 count
= read (fd
, ldavgbuf
, 40);
495 count
= sscanf (ldavgbuf
, "%lf %lf %lf",
496 &load_ave
[0], &load_ave
[1], &load_ave
[2]);
500 for (elem
= 0; elem
< nelem
&& elem
< count
; elem
++)
501 loadavg
[elem
] = load_ave
[elem
];
505 #endif /* __linux__ */
507 #if !defined (LDAV_DONE) && defined (NeXT)
509 /* The NeXT code was adapted from iscreen 3.2. */
512 struct processor_set_basic_info info
;
515 /* We only know how to get the 1-minute average for this system,
516 so even if the caller asks for more than 1, we only return 1. */
518 if (!getloadavg_initialized
)
520 if (processor_set_default (host_self (), &default_set
) == KERN_SUCCESS
)
521 getloadavg_initialized
= 1;
524 if (getloadavg_initialized
)
526 info_count
= PROCESSOR_SET_BASIC_INFO_COUNT
;
527 if (processor_set_info (default_set
, PROCESSOR_SET_BASIC_INFO
, &host
,
528 (processor_set_info_t
) &info
, &info_count
)
530 getloadavg_initialized
= 0;
534 loadavg
[elem
++] = (double) info
.load_average
/ LOAD_SCALE
;
538 if (!getloadavg_initialized
)
542 #if !defined (LDAV_DONE) && defined (UMAX)
544 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
545 have a /dev/kmem. Information about the workings of the running kernel
546 can be gathered with inq_stats system calls.
547 We only know how to get the 1-minute average for this system. */
549 struct proc_summary proc_sum_data
;
550 struct stat_descr proc_info
;
552 register unsigned int i
, j
;
556 register unsigned int c
, i
;
557 struct cpu_config conf
;
558 struct stat_descr desc
;
561 desc
.sd_subsys
= SUBSYS_CPU
;
562 desc
.sd_type
= CPUTYPE_CONFIG
;
563 desc
.sd_addr
= (char *) &conf
;
564 desc
.sd_size
= sizeof conf
;
566 if (inq_stats (1, &desc
))
570 for (i
= 0; i
< conf
.config_maxclass
; ++i
)
572 struct class_stats stats
;
573 bzero ((char *) &stats
, sizeof stats
);
575 desc
.sd_type
= CPUTYPE_CLASS
;
577 desc
.sd_addr
= (char *) &stats
;
578 desc
.sd_size
= sizeof stats
;
580 if (inq_stats (1, &desc
))
583 c
+= stats
.class_numcpus
;
586 samples
= cpus
< 2 ? 3 : (2 * cpus
/ 3);
589 proc_info
.sd_next
= 0;
590 proc_info
.sd_subsys
= SUBSYS_PROC
;
591 proc_info
.sd_type
= PROCTYPE_SUMMARY
;
592 proc_info
.sd_addr
= (char *) &proc_sum_data
;
593 proc_info
.sd_size
= sizeof (struct proc_summary
);
594 proc_info
.sd_sizeused
= 0;
596 if (inq_stats (1, &proc_info
) != 0)
599 load
= proc_sum_data
.ps_nrunnable
;
601 for (i
= samples
- 1; i
> 0; --i
)
603 load
+= proc_sum_data
.ps_nrun
[j
];
604 if (j
++ == PS_NRUNSIZE
)
609 loadavg
[elem
++] = load
/ samples
/ cpus
;
612 #if !defined (LDAV_DONE) && defined (DGUX)
614 /* This call can return -1 for an error, but with good args
615 it's not supposed to fail. The first argument is for no
616 apparent reason of type `long int *'. */
617 dg_sys_info ((long int *) &load_info
,
618 DG_SYS_INFO_LOAD_INFO_TYPE
,
619 DG_SYS_INFO_LOAD_VERSION_0
);
622 loadavg
[elem
++] = load_info
.one_minute
;
624 loadavg
[elem
++] = load_info
.five_minute
;
626 loadavg
[elem
++] = load_info
.fifteen_minute
;
629 #if !defined (LDAV_DONE) && defined (apollo)
631 /* Apollo code from lisch@mentorg.com (Ray Lischner).
633 This system call is not documented. The load average is obtained as
634 three long integers, for the load average over the past minute,
635 five minutes, and fifteen minutes. Each value is a scaled integer,
636 with 16 bits of integer part and 16 bits of fraction part.
638 I'm not sure which operating system first supported this system call,
639 but I know that SR10.2 supports it. */
641 extern void proc1_$
get_loadav ();
642 unsigned long load_ave
[3];
644 proc1_$
get_loadav (load_ave
);
647 loadavg
[elem
++] = load_ave
[0] / 65536.0;
649 loadavg
[elem
++] = load_ave
[1] / 65536.0;
651 loadavg
[elem
++] = load_ave
[2] / 65536.0;
654 #if !defined (LDAV_DONE) && defined (OSF_MIPS)
657 struct tbl_loadavg load_ave
;
658 table (TBL_LOADAVG
, 0, &load_ave
, 1, sizeof (load_ave
));
660 = (load_ave
.tl_lscale
== 0
661 ? load_ave
.tl_avenrun
.d
[0]
662 : (load_ave
.tl_avenrun
.l
[0] / (double) load_ave
.tl_lscale
));
663 #endif /* OSF_MIPS */
665 #if !defined (LDAV_DONE) && defined (VMS)
666 /* VMS specific code -- read from the Load Ave driver. */
668 LOAD_AVE_TYPE load_ave
[3];
669 static int getloadavg_initialized
= 0;
678 /* Ensure that there is a channel open to the load ave device. */
679 if (!getloadavg_initialized
)
681 /* Attempt to open the channel. */
683 descriptor
.dsc$w_length
= 18;
684 descriptor
.dsc$a_pointer
= "$$VMS_LOAD_AVERAGE";
686 $
DESCRIPTOR (descriptor
, "LAV0:");
688 if (sys$
assign (&descriptor
, &channel
, 0, 0) & 1)
689 getloadavg_initialized
= 1;
692 /* Read the load average vector. */
693 if (getloadavg_initialized
694 && !(sys$
qiow (0, channel
, IO$_READVBLK
, 0, 0, 0,
695 load_ave
, 12, 0, 0, 0, 0) & 1))
697 sys$
dassgn (channel
);
698 getloadavg_initialized
= 0;
701 if (!getloadavg_initialized
)
705 #if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
707 /* UNIX-specific code -- read the average from /dev/kmem. */
709 #define LDAV_PRIVILEGED /* This code requires special installation. */
711 LOAD_AVE_TYPE load_ave
[3];
713 /* Get the address of LDAV_SYMBOL. */
718 strcpy (nl
[0].n_name
, LDAV_SYMBOL
);
719 strcpy (nl
[1].n_name
, "");
720 #else /* NLIST_STRUCT */
721 #ifdef NLIST_NAME_UNION
722 nl
[0].n_un
.n_name
= LDAV_SYMBOL
;
723 nl
[1].n_un
.n_name
= 0;
724 #else /* not NLIST_NAME_UNION */
725 nl
[0].n_name
= LDAV_SYMBOL
;
727 #endif /* not NLIST_NAME_UNION */
728 #endif /* NLIST_STRUCT */
731 if (nlist (KERNEL_FILE
, nl
) >= 0)
732 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
734 #ifdef FIXUP_KERNEL_SYMBOL_ADDR
735 FIXUP_KERNEL_SYMBOL_ADDR (nl
);
737 offset
= nl
[0].n_value
;
739 #endif /* !SUNOS_5 */
743 ldav_off
= sysmp (MP_KERNADDR
, MPKA_AVENRUN
);
745 offset
= (long) ldav_off
& 0x7fffffff;
749 /* Make sure we have /dev/kmem open. */
750 if (!getloadavg_initialized
)
753 channel
= open ("/dev/kmem", 0);
755 getloadavg_initialized
= 1;
757 /* We pass 0 for the kernel, corefile, and swapfile names
758 to use the currently running kernel. */
759 kd
= kvm_open (0, 0, 0, O_RDONLY
, 0);
762 /* nlist the currently running kernel. */
764 offset
= nl
[0].n_value
;
765 getloadavg_initialized
= 1;
770 /* If we can, get the load average values. */
771 if (offset
&& getloadavg_initialized
)
773 /* Try to read the load. */
775 if (lseek (channel
, offset
, 0) == -1L
776 || read (channel
, (char *) load_ave
, sizeof (load_ave
))
777 != sizeof (load_ave
))
780 getloadavg_initialized
= 0;
783 if (kvm_read (kd
, offset
, (char *) load_ave
, sizeof (load_ave
))
784 != sizeof (load_ave
))
787 getloadavg_initialized
= 0;
792 if (offset
== 0 || !getloadavg_initialized
)
794 #endif /* LOAD_AVE_TYPE and not VMS */
796 #if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
798 loadavg
[elem
++] = LDAV_CVT (load_ave
[0]);
800 loadavg
[elem
++] = LDAV_CVT (load_ave
[1]);
802 loadavg
[elem
++] = LDAV_CVT (load_ave
[2]);
805 #endif /* !LDAV_DONE && LOAD_AVE_TYPE */
810 /* Set errno to zero to indicate that there was no particular error;
811 this function just can't work at all on this system. */
817 #endif /* ! HAVE_GETLOADAVG */
828 naptime
= atoi (argv
[1]);
835 errno
= 0; /* Don't be misled if it doesn't set errno. */
836 loads
= getloadavg (avg
, 3);
839 perror ("Error getting load average");
843 printf ("1-minute: %f ", avg
[0]);
845 printf ("5-minute: %f ", avg
[1]);
847 printf ("15-minute: %f ", avg
[2]);