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]: Name of 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>
75 /* The existing Emacs configuration files define a macro called
76 LOAD_AVE_CVT, which accepts a value of type LOAD_AVE_TYPE, and
77 returns the load average multiplied by 100. What we actually want
78 is a macro called LDAV_CVT, which returns the load average as an
81 For backwards compatibility, we'll define LDAV_CVT in terms of
82 LOAD_AVE_CVT, but future machine config files should just define
85 #if !defined(LDAV_CVT) && defined(LOAD_AVE_CVT)
86 #define LDAV_CVT(n) (LOAD_AVE_CVT (n) / 100.0)
89 #if !defined (BSD) && defined (ultrix)
90 /* Ultrix behaves like BSD on Vaxen. */
95 /* NeXT in the 2.{0,1,2} releases defines BSD in <sys/param.h>, which
96 conflicts with the definition understood in this file, that this
100 /* NeXT defines FSCALE in <sys/param.h>. However, we take FSCALE being
101 defined to mean that the nlist method should be used, which is not true. */
105 /* Set values that are different from the defaults, which are
106 set a little farther down with #ifndef. */
109 /* Some shorthands. */
111 #if defined (HPUX) && !defined (hpux)
115 #if defined(hp300) && !defined(hpux)
119 #if defined(ultrix) && defined(mips)
123 #if defined(sun) && defined(SVR4)
127 #if defined (__osf__) && defined (__alpha__)
131 #if defined (__osf__) && (defined (mips) || defined (__mips__))
133 #include <sys/table.h>
136 /* UTek's /bin/cc on the 4300 has no architecture specific cpp define by
137 default, but _MACH_IND_SYS_TYPES is defined in <sys/types.h>. Combine
138 that with a couple of other things and we'll have a unique match. */
139 #if !defined (tek4300) && defined (unix) && defined (m68k) && defined (mc68000) && defined (mc68020) && defined (_MACH_IND_SYS_TYPES)
140 #define tek4300 /* Define by emacs, but not by other users. */
144 /* VAX C can't handle multi-line #ifs, or lines longer than 256 chars. */
145 #ifndef LOAD_AVE_TYPE
148 #define LOAD_AVE_TYPE long
152 #define LOAD_AVE_TYPE long
156 #define LOAD_AVE_TYPE long
160 #define LOAD_AVE_TYPE long
164 #define LOAD_AVE_TYPE long
168 #define LOAD_AVE_TYPE long
172 #define LOAD_AVE_TYPE long
176 #define LOAD_AVE_TYPE long
180 #define LOAD_AVE_TYPE long
183 #if defined (ardent) && defined (titan)
184 #define LOAD_AVE_TYPE long
188 #define LOAD_AVE_TYPE long
191 #endif /* No LOAD_AVE_TYPE. */
195 /* SunOS and some others define FSCALE in sys/param.h. */
198 #define FSCALE 2048.0
201 #if defined(MIPS) || defined(SVR4) || defined(decstation)
205 #if defined (sgi) || defined (sequent)
206 #define FSCALE 1000.0
209 #if defined (ardent) && defined (titan)
210 #define FSCALE 65536.0
217 #endif /* Not FSCALE. */
219 #if !defined (LDAV_CVT) && defined (FSCALE)
220 #define LDAV_CVT(n) (((double) (n)) / FSCALE)
223 /* VAX C can't handle multi-line #ifs, or lines longer that 256 characters. */
242 #if defined (_SEQUENT_) || defined (sequent)
262 #if defined (ardent) && defined (titan)
274 #endif /* defined (NLIST_STRUCT) */
277 #if defined(sgi) || (defined(mips) && !defined(BSD))
278 #define FIXUP_KERNEL_SYMBOL_ADDR(nl) ((nl)[0].n_value &= ~(1 << 31))
282 #if !defined (KERNEL_FILE) && defined (sequent)
283 #define KERNEL_FILE "/dynix"
286 #if !defined (KERNEL_FILE) && defined (hpux)
287 #define KERNEL_FILE "/hp-ux"
290 #if !defined(KERNEL_FILE) && (defined(_SEQUENT_) || defined(MIPS) || defined(SVR4) || defined(ISC) || defined (sgi) || defined(SVR4) || (defined (ardent) && defined (titan)))
291 #define KERNEL_FILE "/unix"
295 #if !defined (LDAV_SYMBOL) && defined (alliant)
296 #define LDAV_SYMBOL "_Loadavg"
299 #if !defined(LDAV_SYMBOL) && ((defined(hpux) && !defined(hp9000s300)) || defined(_SEQUENT_) || defined(SVR4) || defined(ISC) || defined(sgi) || (defined (ardent) && defined (titan)))
300 #define LDAV_SYMBOL "avenrun"
314 /* LOAD_AVE_TYPE should only get defined if we're going to use the
316 #if !defined(LOAD_AVE_TYPE) && (defined(BSD) || defined(LDAV_CVT) || defined(KERNEL_FILE) || defined(LDAV_SYMBOL))
317 #define LOAD_AVE_TYPE double
325 #else /* NLIST_STRUCT */
327 #endif /* NLIST_STRUCT */
335 #define KERNEL_FILE "/vmunix"
336 #endif /* KERNEL_FILE */
339 #define LDAV_SYMBOL "_avenrun"
340 #endif /* LDAV_SYMBOL */
348 #include <vms/iodef.h>
353 #define LDAV_CVT(n) ((double) (n))
354 #endif /* !LDAV_CVT */
356 #endif /* LOAD_AVE_TYPE */
359 #ifdef HAVE_MACH_MACH_H
360 #include <mach/mach.h>
367 #include <sys/sysmp.h>
373 #include <sys/time.h>
374 #include <sys/wait.h>
375 #include <sys/syscall.h>
378 #include <machine/cpu.h>
379 #include <inq_stats/statistics.h>
380 #include <inq_stats/sysstats.h>
381 #include <inq_stats/cpustats.h>
382 #include <inq_stats/procstats.h>
383 #else /* Not UMAX_43. */
384 #include <sys/sysdefs.h>
385 #include <sys/statistics.h>
386 #include <sys/sysstats.h>
387 #include <sys/cpudefs.h>
388 #include <sys/cpustats.h>
389 #include <sys/procstats.h>
390 #endif /* Not UMAX_43. */
394 #include <sys/dg_sys_info.h>
397 #if defined(HAVE_FCNTL_H) || defined(_POSIX_VERSION)
400 #include <sys/file.h>
403 /* Avoid static vars inside a function since in HPUX they dump as pure. */
406 static processor_set_t default_set
;
407 static int getloadavg_initialized
;
411 static unsigned int cpus
= 0;
412 static unsigned int samples
;
416 static struct dg_sys_info_load_info load_info
; /* what-a-mouthful! */
420 /* File descriptor open to /dev/kmem or VMS load ave driver. */
422 /* Nonzero iff channel is valid. */
423 static int getloadavg_initialized
;
424 /* Offset in kmem to seek to read load average, or 0 means invalid. */
427 #if !defined(VMS) && !defined(sgi)
428 static struct nlist nl
[2];
429 #endif /* Not VMS or sgi */
435 #endif /* LOAD_AVE_TYPE */
437 /* Put the 1 minute, 5 minute and 15 minute load averages
438 into the first NELEM elements of LOADAVG.
439 Return the number written (never more than 3),
440 or -1 if an error occurred. */
443 getloadavg (loadavg
, nelem
)
447 int elem
= 0; /* Return value. */
449 #ifdef NO_GET_LOAD_AVG
451 /* Set errno to zero to indicate that there was no particular error;
452 this function just can't work at all on this system. */
457 #if !defined (LDAV_DONE) && defined (LINUX)
461 #ifndef LINUX_LDAV_FILE
462 #define LINUX_LDAV_FILE "/proc/loadavg"
469 fd
= open (LINUX_LDAV_FILE
, O_RDONLY
);
472 count
= read (fd
, ldavgbuf
, 40);
477 count
= sscanf (ldavgbuf
, "%lf %lf %lf",
478 &load_ave
[0], &load_ave
[1], &load_ave
[2]);
482 for (elem
= 0; elem
< nelem
&& elem
< count
; elem
++)
483 loadavg
[elem
] = load_ave
[elem
];
489 #if !defined (LDAV_DONE) && defined (NeXT)
491 /* The NeXT code was adapted from iscreen 3.2. */
494 struct processor_set_basic_info info
;
499 /* We only know how to get the 1-minute average for this system. */
504 if (!getloadavg_initialized
)
506 if (processor_set_default (host_self (), &default_set
) == KERN_SUCCESS
)
507 getloadavg_initialized
= 1;
510 if (getloadavg_initialized
)
512 info_count
= PROCESSOR_SET_BASIC_INFO_COUNT
;
513 if (processor_set_info (default_set
, PROCESSOR_SET_BASIC_INFO
, &host
,
514 (processor_set_info_t
) &info
, &info_count
)
516 getloadavg_initialized
= 0;
520 loadavg
[elem
++] = (double) info
.load_average
/ LOAD_SCALE
;
524 if (!getloadavg_initialized
)
528 #if !defined (LDAV_DONE) && defined (UMAX)
530 /* UMAX 4.2, which runs on the Encore Multimax multiprocessor, does not
531 have a /dev/kmem. Information about the workings of the running kernel
532 can be gathered with inq_stats system calls.
533 We only know how to get the 1-minute average for this system. */
535 struct proc_summary proc_sum_data
;
536 struct stat_descr proc_info
;
538 register unsigned int i
, j
;
542 register unsigned int c
, i
;
543 struct cpu_config conf
;
544 struct stat_descr desc
;
547 desc
.sd_subsys
= SUBSYS_CPU
;
548 desc
.sd_type
= CPUTYPE_CONFIG
;
549 desc
.sd_addr
= (char *) &conf
;
550 desc
.sd_size
= sizeof conf
;
552 if (inq_stats (1, &desc
))
556 for (i
= 0; i
< conf
.config_maxclass
; ++i
)
558 struct class_stats stats
;
559 bzero ((char *) &stats
, sizeof stats
);
561 desc
.sd_type
= CPUTYPE_CLASS
;
563 desc
.sd_addr
= (char *) &stats
;
564 desc
.sd_size
= sizeof stats
;
566 if (inq_stats (1, &desc
))
569 c
+= stats
.class_numcpus
;
572 samples
= cpus
< 2 ? 3 : (2 * cpus
/ 3);
575 proc_info
.sd_next
= 0;
576 proc_info
.sd_subsys
= SUBSYS_PROC
;
577 proc_info
.sd_type
= PROCTYPE_SUMMARY
;
578 proc_info
.sd_addr
= (char *) &proc_sum_data
;
579 proc_info
.sd_size
= sizeof (struct proc_summary
);
580 proc_info
.sd_sizeused
= 0;
582 if (inq_stats (1, &proc_info
) != 0)
585 load
= proc_sum_data
.ps_nrunnable
;
587 for (i
= samples
- 1; i
> 0; --i
)
589 load
+= proc_sum_data
.ps_nrun
[j
];
590 if (j
++ == PS_NRUNSIZE
)
595 loadavg
[elem
++] = load
/ samples
/ cpus
;
598 #if !defined (LDAV_DONE) && defined (DGUX)
600 /* This call can return -1 for an error, but with good args
601 it's not supposed to fail. The first argument is for no
602 apparent reason of type `long int *'. */
603 dg_sys_info ((long int *) &load_info
,
604 DG_SYS_INFO_LOAD_INFO_TYPE
,
605 DG_SYS_INFO_LOAD_VERSION_0
);
608 loadavg
[elem
++] = load_info
.one_minute
;
610 loadavg
[elem
++] = load_info
.five_minute
;
612 loadavg
[elem
++] = load_info
.fifteen_minute
;
615 #if !defined (LDAV_DONE) && defined (apollo)
617 /* Apollo code from lisch@mentorg.com (Ray Lischner).
619 This system call is not documented. The load average is obtained as
620 three long integers, for the load average over the past minute,
621 five minutes, and fifteen minutes. Each value is a scaled integer,
622 with 16 bits of integer part and 16 bits of fraction part.
624 I'm not sure which operating system first supported this system call,
625 but I know that SR10.2 supports it. */
627 extern void proc1_$
get_loadav ();
628 unsigned long load_ave
[3];
630 proc1_$
get_loadav (load_ave
);
633 loadavg
[elem
++] = load_ave
[0] / 65536.0;
635 loadavg
[elem
++] = load_ave
[1] / 65536.0;
637 loadavg
[elem
++] = load_ave
[2] / 65536.0;
640 #if !defined (LDAV_DONE) && defined (OSF_MIPS)
643 struct tbl_loadavg load_ave
;
644 table (TBL_LOADAVG
, 0, &load_ave
, 1, sizeof (load_ave
));
646 = (load_ave
.tl_lscale
== 0
647 ? load_ave
.tl_avenrun
.d
[0]
648 : (load_ave
.tl_avenrun
.l
[0] / (double) load_ave
.tl_lscale
));
649 #endif /* OSF_MIPS */
651 #if !defined (LDAV_DONE) && defined (VMS)
652 /* VMS specific code -- read from the Load Ave driver. */
654 LOAD_AVE_TYPE load_ave
[3];
655 static int getloadavg_initialized
= 0;
664 /* Ensure that there is a channel open to the load ave device. */
665 if (!getloadavg_initialized
)
667 /* Attempt to open the channel. */
669 descriptor
.dsc$w_length
= 18;
670 descriptor
.dsc$a_pointer
= "$$VMS_LOAD_AVERAGE";
672 $
DESCRIPTOR (descriptor
, "LAV0:");
674 if (sys$
assign (&descriptor
, &channel
, 0, 0) & 1)
675 getloadavg_initialized
= 1;
678 /* Read the load average vector. */
679 if (getloadavg_initialized
680 && !(sys$
qiow (0, channel
, IO$_READVBLK
, 0, 0, 0,
681 load_ave
, 12, 0, 0, 0, 0) & 1))
683 sys$
dassgn (channel
);
684 getloadavg_initialized
= 0;
687 if (!getloadavg_initialized
)
691 #if !defined (LDAV_DONE) && defined(LOAD_AVE_TYPE) && !defined(VMS)
693 /* UNIX-specific code -- read the average from /dev/kmem. */
695 #define LDAV_PRIVILEGED /* This code requires special installation. */
697 LOAD_AVE_TYPE load_ave
[3];
699 /* Get the address of LDAV_SYMBOL. */
705 strcpy (nl
[0].n_name
, LDAV_SYMBOL
);
706 strcpy (nl
[1].n_name
, "");
707 #else /* NLIST_STRUCT */
708 #ifdef NLIST_NAME_UNION
709 nl
[0].n_un
.n_name
= LDAV_SYMBOL
;
710 nl
[1].n_un
.n_name
= 0;
711 #else /* not NLIST_NAME_UNION */
712 nl
[0].n_name
= LDAV_SYMBOL
;
714 #endif /* not NLIST_NAME_UNION */
715 #endif /* NLIST_STRUCT */
717 if (nlist (KERNEL_FILE
, nl
) >= 0)
718 /* Omit "&& nl[0].n_type != 0 " -- it breaks on Sun386i. */
720 #ifdef FIXUP_KERNEL_SYMBOL_ADDR
721 FIXUP_KERNEL_SYMBOL_ADDR (nl
);
723 offset
= nl
[0].n_value
;
728 ldav_off
= sysmp (MP_KERNADDR
, MPKA_AVENRUN
);
730 offset
= (long) ldav_off
& 0x7fffffff;
732 #endif /* !SUNOS_5 */
735 /* Make sure we have /dev/kmem open. */
736 if (!getloadavg_initialized
)
739 channel
= open ("/dev/kmem", 0);
741 getloadavg_initialized
= 1;
743 kd
= kvm_open (0, 0, 0, O_RDONLY
, 0);
747 getloadavg_initialized
= 1;
752 /* If we can, get the load average values. */
753 if (offset
&& getloadavg_initialized
)
755 /* Try to read the load. */
757 if (lseek (channel
, offset
, 0) == -1L
758 || read (channel
, (char *) load_ave
, sizeof (load_ave
))
759 != sizeof (load_ave
))
762 getloadavg_initialized
= 0;
765 if (kvm_read (kd
, offset
, (char *) load_ave
, sizeof (load_ave
))
766 != sizeof (load_ave
))
769 getloadavg_initialized
= 0;
774 if (offset
== 0 || !getloadavg_initialized
)
776 #endif /* LOAD_AVE_TYPE and not VMS */
778 #if !defined (LDAV_DONE) && defined (LOAD_AVE_TYPE) /* Including VMS. */
780 loadavg
[elem
++] = LDAV_CVT (load_ave
[0]);
782 loadavg
[elem
++] = LDAV_CVT (load_ave
[1]);
784 loadavg
[elem
++] = LDAV_CVT (load_ave
[2]);
787 #endif /* !LDAV_DONE && LOAD_AVE_TYPE */
792 /* Set errno to zero to indicate that there was no particular error;
793 this function just can't work at all on this system. */
808 naptime
= atoi (argv
[1]);
818 errno
= 0; /* Don't be misled if it doesn't set errno. */
819 loads
= getloadavg (avg
, 3);
822 perror ("Error getting load average");
826 printf ("1-minute: %f ", avg
[0]);
828 printf ("5-minute: %f ", avg
[1]);
830 printf ("15-minute: %f ", avg
[2]);