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atop.c
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/*
** ATOP - System & Process Monitor
**
** The program 'atop' offers the possibility to view the activity of
** the system on system-level as well as process-level.
**
** This source-file contains the main-function, which verifies the
** calling-parameters and takes care of initialization.
** The engine-function drives the main sample-loop in which after the
** indicated interval-time a snapshot is taken of the system-level and
** process-level counters and the deviations are calculated and
** visualized for the user.
** ==========================================================================
** Author: Gerlof Langeveld
** E-mail: [email protected]
** Date: November 1996
** Linux-port: June 2000
** Modified: May 2001 - Ported to kernel 2.4
** --------------------------------------------------------------------------
** Copyright (C) 2000-2018 Gerlof Langeveld
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 2, or (at your option) any
** later version.
**
** This program is distributed in the hope that it will be useful, but
** WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
** See the GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
** --------------------------------------------------------------------------
**
** After initialization, the main-function calls the ENGINE.
** For every cycle (so after another interval) the ENGINE calls various
** functions as shown below:
**
** +---------------------------------------------------------------------+
** | E N G I N E |
** | |
** | |
** | _____________________await interval-timer_____________________ |
** | | ^ |
** | | ________ ________ ________ ________ | |
** | | ^ | ^ | ^ | ^ | | |
** +---|-----|--------|-----|--------|----|--------|----|--------|----|--+
** | | | | | | | | | |
** +--V-----|--+ +--V-----|--+ +--V----|--+ +--V----|--+ +--V----|-+
** | | | | | | | | | |
** | photosyst | | photoproc | | acct | | deviate | | print |
** | | | | |photoproc | | ...syst | | |
** | | | | | | | ...proc | | |
** +-----------+ +-----------+ +----------+ +----------+ +---------+
** ^ ^ ^ ^ |
** | | | | |
** | | | V V
** ______ _________ __________ ________ _________
** / \ / \ / \ / \ / \
** /proc /proc accounting task screen or
** file database file
** \______/ \_________/ \__________/ \________/ \_________/
**
** - photosyst()
** Takes a snapshot of the counters related to resource-usage on
** system-level (cpu, disk, memory, network).
** This code is UNIX-flavor dependent; in case of Linux the counters
** are retrieved from /proc.
**
** - photoproc()
** Takes a snapshot of the counters related to resource-usage of
** tasks which are currently active. For this purpose the whole
** task-list is read.
** This code is UNIX-flavor dependent; in case of Linux the counters
** are retrieved from /proc.
**
** - acctphotoproc()
** Takes a snapshot of the counters related to resource-usage of
** tasks which have been finished during the last interval.
** For this purpose all new records in the accounting-file are read.
**
** When all counters have been gathered, functions are called to calculate
** the difference between the current counter-values and the counter-values
** of the previous cycle. These functions operate on the system-level
** as well as on the task-level counters.
** These differences are stored in a new structure(-table).
**
** - deviatsyst()
** Calculates the differences between the current system-level
** counters and the corresponding counters of the previous cycle.
**
** - deviattask()
** Calculates the differences between the current task-level
** counters and the corresponding counters of the previous cycle.
** The per-task counters of the previous cycle are stored in the
** task-database; this "database" is implemented as a linked list
** of taskinfo structures in memory (so no disk-accesses needed).
** Within this linked list hash-buckets are maintained for fast searches.
** The entire task-database is handled via a set of well-defined
** functions from which the name starts with "pdb_..." (see the
** source-file procdbase.c).
** The processes which have been finished during the last cycle
** are also treated by deviattask() in order to calculate what their
** resource-usage was before they finished.
**
** All information is ready to be visualized now.
** There is a structure which holds the start-address of the
** visualization-function to be called. Initially this structure contains
** the address of the generic visualization-function ("generic_samp"), but
** these addresses can be modified in the main-function depending on particular
** flags. In this way various representation-layers (ASCII, graphical, ...)
** can be linked with 'atop'; the one to use can eventually be chosen
** at runtime.
**
** $Log: atop.c,v $
** Revision 1.49 2010/10/23 14:01:00 gerlof
** Show counters for total number of running and sleep (S and D) threads.
**
** Revision 1.48 2010/10/23 08:18:15 gerlof
** Catch signal SIGUSR2 to take a final sample and stop.
** Needed for improved of suspend/hibernate.
**
** Revision 1.47 2010/04/23 12:20:19 gerlof
** Modified mail-address in header.
**
** Revision 1.46 2010/04/23 09:57:28 gerlof
** Version (flag -V) handled earlier after startup.
**
** Revision 1.45 2010/04/17 17:19:41 gerlof
** Allow modifying the layout of the columns in the system lines.
**
** Revision 1.44 2010/04/16 13:00:23 gerlof
** Automatically start another version of atop if the logfile to
** be read has not been created by the current version.
**
** Revision 1.43 2010/03/04 10:51:10 gerlof
** Support I/O-statistics on logical volumes and MD devices.
**
** Revision 1.42 2009/12/31 11:33:33 gerlof
** Sanity-check to bypass kernel-bug showing 497 days of CPU-consumption.
**
** Revision 1.41 2009/12/17 10:51:31 gerlof
** Allow own defined process line with key 'o' and a definition
** in the atoprc file.
**
** Revision 1.40 2009/12/17 08:15:15 gerlof
** Introduce branch-key to go to specific time in raw file.
**
** Revision 1.39 2009/12/10 13:34:32 gerlof
** Cosmetical changes.
**
** Revision 1.38 2009/12/10 11:55:38 gerlof
** Introduce -L flag for line length.
**
** Revision 1.37 2009/12/10 10:43:33 gerlof
** Correct calculation of node name.
**
** Revision 1.36 2009/12/10 09:19:06 gerlof
** Various changes related to redesign of user-interface.
** Made by JC van Winkel.
**
** Revision 1.35 2009/11/27 15:11:55 gerlof
** *** empty log message ***
**
** Revision 1.34 2009/11/27 15:07:25 gerlof
** Give up root-privileges at a earlier stage.
**
** Revision 1.33 2009/11/27 14:01:01 gerlof
** Introduce system-wide configuration file /etc/atoprc
**
** Revision 1.32 2008/01/07 10:16:13 gerlof
** Implement summaries for atopsar.
**
** Revision 1.31 2007/11/06 09:16:05 gerlof
** Add keyword atopsarflags to configuration-file ~/.atoprc
**
** Revision 1.30 2007/08/16 11:58:35 gerlof
** Add support for atopsar reporting.
**
** Revision 1.29 2007/03/20 13:01:36 gerlof
** Introduction of variable supportflags.
**
** Revision 1.28 2007/03/20 12:13:00 gerlof
** Be sure that all tstat struct's are initialized with binary zeroes.
**
** Revision 1.27 2007/02/19 11:55:04 gerlof
** Bug-fix: flag -S was not recognized any more.
**
** Revision 1.26 2007/02/13 10:34:20 gerlof
** Support parseable output with flag -P
**
** Revision 1.25 2007/01/26 12:10:40 gerlof
** Add configuration-value 'swoutcritsec'.
**
** Revision 1.24 2007/01/18 10:29:22 gerlof
** Improved syntax-checking for ~/.atoprc file.
** Support for network-interface busy-percentage.
**
** Revision 1.23 2006/02/07 08:27:04 gerlof
** Cosmetic changes.
**
** Revision 1.22 2005/10/28 09:50:29 gerlof
** All flags/subcommands are defined as macro's.
**
** Revision 1.21 2005/10/21 09:48:48 gerlof
** Per-user accumulation of resource consumption.
**
** Revision 1.20 2004/12/14 15:05:38 gerlof
** Implementation of patch-recognition for disk and network-statistics.
**
** Revision 1.19 2004/10/26 13:42:49 gerlof
** Also lock current physical pages in memory.
**
** Revision 1.18 2004/09/15 08:23:42 gerlof
** Set resource limit for locked memory to infinite, because
** in certain environments it is set to 32K (causes atop-malloc's
** to fail).
**
** Revision 1.17 2004/05/06 09:45:44 gerlof
** Ported to kernel-version 2.6.
**
** Revision 1.16 2003/07/07 09:18:22 gerlof
** Cleanup code (-Wall proof).
**
** Revision 1.15 2003/07/03 11:16:14 gerlof
** Implemented subcommand `r' (reset).
**
** Revision 1.14 2003/06/30 11:29:12 gerlof
** Handle configuration file ~/.atoprc
**
** Revision 1.13 2003/01/14 09:01:10 gerlof
** Explicit clearing of malloced space for exited processes.
**
** Revision 1.12 2002/10/30 13:44:51 gerlof
** Generate notification for statistics since boot.
**
** Revision 1.11 2002/10/08 11:34:52 gerlof
** Modified storage of raw filename.
**
** Revision 1.10 2002/09/26 13:51:47 gerlof
** Limit header lines by not showing disks.
**
** Revision 1.9 2002/09/17 10:42:00 gerlof
** Copy functions rawread() and rawwrite() to separate source-file rawlog.c
**
** Revision 1.8 2002/08/30 07:49:35 gerlof
** Implement possibility to store and retrieve atop-data in raw format.
**
** Revision 1.7 2002/08/27 12:09:16 gerlof
** Allow raw data file to be written and to be read (with compression).
**
** Revision 1.6 2002/07/24 11:12:07 gerlof
** Redesigned to ease porting to other UNIX-platforms.
**
** Revision 1.5 2002/07/11 09:15:53 root
** *** empty log message ***
**
** Revision 1.4 2002/07/08 09:20:45 root
** Bug solution: flag list overflow.
**
** Revision 1.3 2001/11/07 09:17:41 gerlof
** Use /proc instead of /dev/kmem for process-level statistics.
**
** Revision 1.2 2001/10/04 13:03:15 gerlof
** Separate kopen() function called i.s.o. implicit with first kmem-read
**
** Revision 1.1 2001/10/02 10:43:19 gerlof
** Initial revision
**
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <time.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/utsname.h>
#include <string.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <regex.h>
#include "atop.h"
#include "acctproc.h"
#include "ifprop.h"
#include "photoproc.h"
#include "photosyst.h"
#include "showgeneric.h"
#include "parseable.h"
#include "json.h"
#include "gpucom.h"
#define allflags "ab:cde:fghijklmnopqrstuvwxyz1ABCDEFGHIJ:KL:MNOP:QRSTUVWXYZ"
#define MAXFL 64 /* maximum number of command-line flags */
/*
** declaration of global variables
*/
struct utsname utsname;
int utsnodenamelen;
time_t pretime; /* timing info */
time_t curtime; /* timing info */
unsigned long interval = 10;
unsigned long sampcnt;
char screen;
int linelen = 80;
char acctreason; /* accounting not active (return val) */
char rawname[RAWNAMESZ];
char rawreadflag;
time_t begintime, endtime, cursortime; // epoch or time in day
char flaglist[MAXFL];
char deviatonly = 1;
char usecolors = 1; /* boolean: colors for high occupation */
char threadview = 0; /* boolean: show individual threads */
char calcpss = 0; /* boolean: read/calculate process PSS */
char getwchan = 0; /* boolean: obtain wchan string */
char rmspaces = 0; /* boolean: remove spaces from command */
/* name in case of parseable output */
unsigned short hertz;
unsigned int pidwidth;
unsigned int pagesize;
unsigned int nrgpus;
int osrel;
int osvers;
int ossub;
int supportflags; /* supported features */
char **argvp;
struct visualize vis = {generic_samp, generic_error,
generic_end, generic_usage};
/*
** argument values
*/
static char awaittrigger; /* boolean: awaiting trigger */
static unsigned int nsamples = 0xffffffff;
static char midnightflag;
static char rawwriteflag;
/*
** interpretation of defaults-file /etc/atoprc and $HOME/.atop
*/
static void readrc(char *, int);
void do_flags(char *, char *);
void do_interval(char *, char *);
void do_linelength(char *, char *);
void do_username(char *, char *);
void do_procname(char *, char *);
void do_maxcpu(char *, char *);
void do_maxgpu(char *, char *);
void do_maxdisk(char *, char *);
void do_maxmdd(char *, char *);
void do_maxlvm(char *, char *);
void do_maxintf(char *, char *);
void do_maxifb(char *, char *);
void do_maxnfsm(char *, char *);
void do_maxcont(char *, char *);
void do_maxnuma(char *, char *);
void do_maxllc(char *, char *);
void do_colinfo(char *, char *);
void do_colalmost(char *, char *);
void do_colcrit(char *, char *);
void do_colthread(char *, char *);
void do_ownsysprcline(char *, char *);
void do_ownallcpuline(char *, char *);
void do_ownindivcpuline(char *, char *);
void do_owncplline(char *, char *);
void do_ownmemline(char *, char *);
void do_ownswpline(char *, char *);
void do_ownpagline(char *, char *);
void do_ownmemnumaline(char *, char *);
void do_owncpunumaline(char *, char *);
void do_ownllcline(char *, char *);
void do_owndskline(char *, char *);
void do_ownnettransportline(char *, char *);
void do_ownnetnetline(char *, char *);
void do_ownnetinterfaceline(char *, char *);
void do_owninfinibandline(char *, char *);
void do_ownprocline(char *, char *);
void do_cpucritperc(char *, char *);
void do_gpucritperc(char *, char *);
void do_memcritperc(char *, char *);
void do_swpcritperc(char *, char *);
void do_dskcritperc(char *, char *);
void do_netcritperc(char *, char *);
void do_swoutcritsec(char *, char *);
void do_almostcrit(char *, char *);
void do_atopsarflags(char *, char *);
void do_pacctdir(char *, char *);
void do_perfevents(char *, char *);
static struct {
char *tag;
void (*func)(char *, char *);
int sysonly;
} manrc[] = {
{ "flags", do_flags, 0, },
{ "interval", do_interval, 0, },
{ "linelen", do_linelength, 0, },
{ "username", do_username, 0, },
{ "procname", do_procname, 0, },
{ "maxlinecpu", do_maxcpu, 0, },
{ "maxlinegpu", do_maxgpu, 0, },
{ "maxlinedisk", do_maxdisk, 0, },
{ "maxlinemdd", do_maxmdd, 0, },
{ "maxlinelvm", do_maxlvm, 0, },
{ "maxlineintf", do_maxintf, 0, },
{ "maxlineifb", do_maxifb, 0, },
{ "maxlinenfsm", do_maxnfsm, 0, },
{ "maxlinecont", do_maxcont, 0, },
{ "maxlinenuma", do_maxnuma, 0, },
{ "maxlinellc", do_maxllc, 0, },
{ "colorinfo", do_colinfo, 0, },
{ "coloralmost", do_colalmost, 0, },
{ "colorcritical", do_colcrit, 0, },
{ "colorthread", do_colthread, 0, },
{ "ownallcpuline", do_ownallcpuline, 0, },
{ "ownonecpuline", do_ownindivcpuline, 0, },
{ "owncplline", do_owncplline, 0, },
{ "ownmemline", do_ownmemline, 0, },
{ "ownswpline", do_ownswpline, 0, },
{ "ownpagline", do_ownpagline, 0, },
{ "ownmemnumaline", do_ownmemnumaline, 0, },
{ "ownnumacpuline", do_owncpunumaline, 0, },
{ "ownllcline", do_ownllcline, 0, },
{ "owndskline", do_owndskline, 0, },
{ "ownnettrline", do_ownnettransportline, 0, },
{ "ownnetnetline", do_ownnetnetline, 0, },
{ "ownnetifline", do_ownnetinterfaceline, 0, },
{ "ownifbline", do_owninfinibandline, 0, },
{ "ownprocline", do_ownprocline, 0, },
{ "ownsysprcline", do_ownsysprcline, 0, },
{ "owndskline", do_owndskline, 0, },
{ "cpucritperc", do_cpucritperc, 0, },
{ "gpucritperc", do_gpucritperc, 0, },
{ "memcritperc", do_memcritperc, 0, },
{ "swpcritperc", do_swpcritperc, 0, },
{ "dskcritperc", do_dskcritperc, 0, },
{ "netcritperc", do_netcritperc, 0, },
{ "swoutcritsec", do_swoutcritsec, 0, },
{ "almostcrit", do_almostcrit, 0, },
{ "atopsarflags", do_atopsarflags, 0, },
{ "perfevents", do_perfevents, 0, },
{ "pacctdir", do_pacctdir, 1, },
};
/*
** internal prototypes
*/
static void engine(void);
int
main(int argc, char *argv[])
{
register int i;
int c;
char *p;
struct rlimit rlim;
/*
** since privileged actions will be done later on, at this stage
** the root-privileges are dropped by switching effective user-id
** to real user-id (security reasons)
*/
if (! droprootprivs() )
{
fprintf(stderr, "not possible to drop root privs\n");
exit(42);
}
/*
** preserve command arguments to allow restart of other version
*/
argvp = argv;
/*
** read defaults-files /etc/atoprc en $HOME/.atoprc (if any)
*/
readrc("/etc/atoprc", 1);
if ( (p = getenv("HOME")) )
{
char path[1024];
snprintf(path, sizeof path, "%s/.atoprc", p);
readrc(path, 0);
}
/*
** check if we are supposed to behave as 'atopsar'
** i.e. system statistics only
*/
if ( (p = strrchr(argv[0], '/')))
p++;
else
p = argv[0];
if ( memcmp(p, "atopsar", 7) == 0)
return atopsar(argc, argv);
/*
** interpret command-line arguments & flags
*/
if (argc > 1)
{
/*
** gather all flags for visualization-functions
**
** generic flags will be handled here;
** unrecognized flags are passed to the print-routines
*/
i = 0;
while (i < MAXFL-1 && (c=getopt(argc, argv, allflags)) != EOF)
{
switch (c)
{
case '?': /* usage wanted ? */
prusage(argv[0]);
break;
case 'V': /* version wanted ? */
printf("%s\n", getstrvers());
exit(0);
case 'w': /* writing of raw data ? */
rawwriteflag++;
if (optind >= argc)
prusage(argv[0]);
strncpy(rawname, argv[optind++], RAWNAMESZ-1);
vis.show_samp = rawwrite;
break;
case 'r': /* reading of raw data ? */
if (optind < argc)
{
if (*(argv[optind]) == '-')
{
if (strlen(argv[optind]) == 1)
{
strcpy(rawname,
"/dev/stdin");
optind++;
}
}
else
{
strncpy(rawname, argv[optind],
RAWNAMESZ-1);
optind++;
}
}
rawreadflag++;
break;
case 'S': /* midnight limit ? */
midnightflag++;
break;
case 'b': /* begin time ? */
if ( !getbranchtime(optarg, &begintime) )
prusage(argv[0]);
break;
case 'e': /* end time ? */
if ( !getbranchtime(optarg, &endtime) )
prusage(argv[0]);
break;
case 'P': /* parseable output? */
if ( !parsedef(optarg) )
prusage(argv[0]);
vis.show_samp = parseout;
break;
case 'J': /* json output? */
if ( !jsondef(optarg) )
prusage(argv[0]);
vis.show_samp = jsonout;
break;
case 'L': /* line length */
if ( !numeric(optarg) )
prusage(argv[0]);
linelen = atoi(optarg);
break;
case MALLPROC: /* all processes per sample ? */
deviatonly = 0;
break;
case MCALCPSS: /* calculate PSS per sample ? */
calcpss = 1;
break;
case MGETWCHAN: /* obtain wchan string? */
getwchan = 1;
break;
case MRMSPACES: /* remove spaces from command */
rmspaces = 1;
break;
default: /* gather other flags */
flaglist[i++] = c;
}
}
/*
** get optional interval-value and optional number of samples
*/
if (optind < argc && optind < MAXFL)
{
if (!numeric(argv[optind]))
prusage(argv[0]);
interval = atoi(argv[optind]);
optind++;
if (optind < argc)
{
if (!numeric(argv[optind]) )
prusage(argv[0]);
if ( (nsamples = atoi(argv[optind])) < 1)
prusage(argv[0]);
}
}
}
/*
** determine the name of this node (without domain-name)
** and the kernel-version
*/
(void) uname(&utsname);
if ( (p = strchr(utsname.nodename, '.')) )
*p = '\0';
utsnodenamelen = strlen(utsname.nodename);
sscanf(utsname.release, "%d.%d.%d", &osrel, &osvers, &ossub);
/*
** determine the clock rate and memory page size for this machine
*/
hertz = sysconf(_SC_CLK_TCK);
pagesize = sysconf(_SC_PAGESIZE);
pidwidth = getpidwidth();
/*
** check if raw data from a file must be viewed
*/
if (rawreadflag)
{
rawread();
cleanstop(0);
}
/*
** determine start-time for gathering current statistics
*/
curtime = getboot() / hertz;
/*
** be sure to be leader of an own process group when
** running as a daemon (or at least: when not interactive);
** needed for systemd
*/
if (rawwriteflag)
(void) setpgid(0, 0);
/*
** catch signals for proper close-down
*/
signal(SIGHUP, cleanstop);
signal(SIGTERM, cleanstop);
/*
** regain the root-privileges that we dropped at the beginning
** to do some privileged work
*/
regainrootprivs();
/*
** lock ATOP in memory to get reliable samples (also when
** memory is low and swapping is going on);
** ignored if not running under superuser privileges!
*/
rlim.rlim_cur = RLIM_INFINITY;
rlim.rlim_max = RLIM_INFINITY;
if (setrlimit(RLIMIT_MEMLOCK, &rlim) == 0)
(void) mlockall(MCL_CURRENT|MCL_FUTURE);
/*
** increment CPU scheduling-priority to get reliable samples (also
** during heavy CPU load);
** ignored if not running under superuser privileges!
*/
if ( nice(-20) == -1)
;
set_oom_score_adj();
/*
** switch-on the process-accounting mechanism to register the
** (remaining) resource-usage by processes which have finished
*/
acctreason = acctswon();
/*
** determine properties (like speed) of all interfaces
*/
initifprop();
/*
** open socket to the IP layer to issue getsockopt() calls later on
*/
netatop_ipopen();
/*
** since privileged activities are finished now, there is no
** need to keep running under root-privileges, so switch
** effective user-id to real user-id
*/
if (! droprootprivs() )
mcleanstop(42, "failed to drop root privs\n");
/*
** start the engine now .....
*/
engine();
cleanstop(0);
return 0; /* never reached */
}
/*
** The engine() drives the main-loop of the program
*/
static void
engine(void)
{
struct sigaction sigact;
static time_t timelimit;
void getusr1(int), getusr2(int);
/*
** reserve space for system-level statistics
*/
static struct sstat *cursstat; /* current */
static struct sstat *presstat; /* previous */
static struct sstat *devsstat; /* deviation */
static struct sstat *hlpsstat;
/*
** reserve space for task-level statistics
*/
static struct tstat *curtpres; /* current present list */
static unsigned long curtlen; /* size of present list */
struct tstat *curpexit; /* exited process list */
static struct devtstat devtstat; /* deviation info */
unsigned long ntaskpres; /* number of tasks present */
unsigned long nprocexit; /* number of exited procs */
unsigned long nprocexitnet; /* number of exited procs */
/* via netatopd daemon */
unsigned long noverflow;
int nrgpuproc=0, /* number of GPU processes */
gpupending=0; /* boolean: request sent */
struct gpupidstat *gp = NULL;
/*
** initialization: allocate required memory dynamically
*/
cursstat = calloc(1, sizeof(struct sstat));
presstat = calloc(1, sizeof(struct sstat));
devsstat = calloc(1, sizeof(struct sstat));
ptrverify(cursstat, "Malloc failed for current sysstats\n");
ptrverify(presstat, "Malloc failed for prev sysstats\n");
ptrverify(devsstat, "Malloc failed for deviate sysstats\n");
/*
** install the signal-handler for ALARM, USR1 and USR2 (triggers
* for the next sample)
*/
memset(&sigact, 0, sizeof sigact);
sigact.sa_handler = getusr1;
sigaction(SIGUSR1, &sigact, (struct sigaction *)0);
memset(&sigact, 0, sizeof sigact);
sigact.sa_handler = getusr2;
sigaction(SIGUSR2, &sigact, (struct sigaction *)0);
memset(&sigact, 0, sizeof sigact);
sigact.sa_handler = getalarm;
sigaction(SIGALRM, &sigact, (struct sigaction *)0);
if (interval > 0)
alarm(interval);
if (midnightflag)
{
time_t timenow = time(0);
struct tm *tp = localtime(&timenow);
tp->tm_hour = 23;
tp->tm_min = 59;
tp->tm_sec = 59;
timelimit = mktime(tp);
}
/*
** open socket to the atopgpud daemon for GPU statistics
*/
nrgpus = gpud_init();
if (nrgpus)
supportflags |= GPUSTAT;
/*
** MAIN-LOOP:
** - Wait for the requested number of seconds or for other trigger
**
** - System-level counters
** get current counters
** calculate the differences with the previous sample
**
** - Process-level counters
** get current counters from running & exited processes
** calculate the differences with the previous sample
**
** - Call the print-function to visualize the differences
*/
for (sampcnt=0; sampcnt < nsamples; sampcnt++)
{
char lastcmd;
/*
** if the limit-flag is specified:
** check if the next sample is expected before midnight;
** if not, stop atop now
*/
if (midnightflag && (curtime+interval) > timelimit)
break;
/*
** wait for alarm-signal to arrive (except first sample)
** or wait for SIGUSR1/SIGUSR2
*/
if (sampcnt > 0 && awaittrigger)
pause();
awaittrigger = 1;
/*
** gather time info for this sample
*/
pretime = curtime;
curtime = time(0); /* seconds since 1-1-1970 */
/*
** send request for statistics to atopgpud
*/
if (nrgpus)
gpupending = gpud_statrequest();
/*
** take a snapshot of the current system-level statistics
** and calculate the deviations (i.e. calculate the activity
** during the last sample)
*/
hlpsstat = cursstat; /* swap current/prev. stats */
cursstat = presstat;
presstat = hlpsstat;
photosyst(cursstat); /* obtain new counters */
/*
** receive and parse response from atopgpud
*/
if (nrgpus && gpupending)
{
nrgpuproc = gpud_statresponse(nrgpus, cursstat->gpu.gpu, &gp);
gpupending = 0;
// connection lost or timeout on receive?
if (nrgpuproc == -1)
{
int ng;
// try to reconnect
ng = gpud_init();
if (ng != nrgpus) // no success
nrgpus = 0;
if (nrgpus)
{
// request for stats again
if (gpud_statrequest())
{
// receive stats response
nrgpuproc = gpud_statresponse(nrgpus,
cursstat->gpu.gpu, &gp);
// persistent failure?
if (nrgpuproc == -1)
nrgpus = 0;
}
}
}
cursstat->gpu.nrgpus = nrgpus;
}
deviatsyst(cursstat, presstat, devsstat,
curtime-pretime > 0 ? curtime-pretime : 1);
/*
** take a snapshot of the current task-level statistics
** and calculate the deviations (i.e. calculate the activity
** during the last sample)
**
** first register active tasks
*/
curtpres = NULL;
do
{
curtlen = counttasks(); // worst-case value
curtpres = realloc(curtpres,
curtlen * sizeof(struct tstat));
ptrverify(curtpres, "Malloc failed for %lu tstats\n",
curtlen);
memset(curtpres, 0, curtlen * sizeof(struct tstat));
}
while ( (ntaskpres = photoproc(curtpres, curtlen)) == curtlen);
/*
** register processes that exited during last sample;
** first determine how many processes exited
**
** the number of exited processes is limited to avoid
** that atop explodes in memory and introduces OOM killing
*/
nprocexit = acctprocnt(); /* number of exited processes */
if (nprocexit > MAXACCTPROCS)
{
noverflow = nprocexit - MAXACCTPROCS;
nprocexit = MAXACCTPROCS;
}
else
noverflow = 0;
/*
** determine how many processes have been exited
** for the netatop module (only processes that have
** used the network)
*/
if (nprocexit > 0 && (supportflags & NETATOPD))
nprocexitnet = netatop_exitstore();
else
nprocexitnet = 0;
/*
** reserve space for the exited processes and read them
*/
if (nprocexit > 0)