vmstat_sysinfo.c_getstat

getstat

source

sysinfo.c

line

346 - 416

概要

void getstat(

 jiff *restrict cuse, 
 jiff *restrict cice, 
 jiff *restrict csys, 
 jiff *restrict cide, 
 jiff *restrict ciow, 
 jiff *restrict cxxx, 
 jiff *restrict cyyy,
 unsigned long *restrict pin, 
 unsigned long *restrict pout, 
 unsigned long *restrict s_in, 
 unsigned long *restrict sout,
 unsigned *restrict intr, 
 unsigned *restrict ctxt,
 unsigned int *restrict running, 
 unsigned int *restrict blocked,
 unsigned int *restrict btime, 
 unsigned int *restrict processes

)

処理の流れ

• 変数初期化

   351   static int fd;
   352   unsigned long long llbuf = 0;
   353   int need_vmstat_file = 0;
   354   int need_proc_scan = 0;
   355   const char* b;
   356   buff[BUFFSIZE-1] = 0;  /* ensure null termination in buffer */

   358   if(fd){
   359     lseek(fd, 0L, SEEK_SET);
   360   }else{
   361     fd = open("/proc/stat", O_RDONLY, 0);
   362     if(fd == -1) crash("/proc/stat");
   363   }
   364   read(fd,buff,BUFFSIZE-1);
   365   *intr = 0;
   366   *ciow = 0;  /* not separated out until the 2.5.41 kernel */
   367   *cxxx = 0;  /* not separated out until the 2.6.0-test4 kernel */
   368   *cyyy = 0;  /* not separated out until the 2.6.0-test4 kernel */
   369
   370   b = strstr(buff, "cpu ");
   371   if(b) sscanf(b,  "cpu  %Lu %Lu %Lu %Lu %Lu %Lu %Lu", cuse, cice, csys, cide, ciow, cxxx, c
   371 yyy);
   372
   373   b = strstr(buff, "page ");
   374   if(b) sscanf(b,  "page %lu %lu", pin, pout);
   375   else need_vmstat_file = 1;
   376
   377   b = strstr(buff, "swap ");
   378   if(b) sscanf(b,  "swap %lu %lu", s_in, sout);
   379   else need_vmstat_file = 1;
   380
   381   b = strstr(buff, "intr ");
   382   if(b) sscanf(b,  "intr %Lu", &llbuf);
   383   *intr = llbuf;
   384
   385   b = strstr(buff, "ctxt ");
   386   if(b) sscanf(b,  "ctxt %Lu", &llbuf);
   387   *ctxt = llbuf;
   388
   389   b = strstr(buff, "btime ");
   390   if(b) sscanf(b,  "btime %u", btime);
   391
   392   b = strstr(buff, "processes ");
   393   if(b) sscanf(b,  "processes %u", processes);
   394
   395   b = strstr(buff, "procs_running ");
   396   if(b) sscanf(b,  "procs_running %u", running);
   397   else need_proc_scan = 1;
   398
   399   b = strstr(buff, "procs_blocked ");
   400   if(b) sscanf(b,  "procs_blocked %u", blocked);
   401   else need_proc_scan = 1;
   402
   403   if(need_proc_scan){   /* Linux 2.5.46 (approximately) and below */
   404     getrunners(running, blocked);
   405   }
   406
   407   (*running)--;   // exclude vmstat itself
   408
   409   if(need_vmstat_file){  /* Linux 2.5.40-bk4 and above */
   410     vminfo();
   411     *pin  = vm_pgpgin;
   412     *pout = vm_pgpgout;
   413     *s_in = vm_pswpin;
   414     *sout = vm_pswpout;
   415   }
   416 }

function

   346 void getstat(jiff *restrict cuse, jiff *restrict cice, jiff *restrict csys, jiff *restrict c
   346 ide, jiff *restrict ciow, jiff *restrict cxxx, jiff *restrict cyyy,
   347              unsigned long *restrict pin, unsigned long *restrict pout, unsigned long *restr
   347 ict s_in, unsigned long *restrict sout,
   348              unsigned *restrict intr, unsigned *restrict ctxt,
   349              unsigned int *restrict running, unsigned int *restrict blocked,
   350              unsigned int *restrict btime, unsigned int *restrict processes) {
   351   static int fd;
   352   unsigned long long llbuf = 0;
   353   int need_vmstat_file = 0;
   354   int need_proc_scan = 0;
   355   const char* b;
   356   buff[BUFFSIZE-1] = 0;  /* ensure null termination in buffer */
   357
   358   if(fd){
   359     lseek(fd, 0L, SEEK_SET);
   360   }else{
   361     fd = open("/proc/stat", O_RDONLY, 0);
   362     if(fd == -1) crash("/proc/stat");
   363   }
   364   read(fd,buff,BUFFSIZE-1);
   365   *intr = 0;
   366   *ciow = 0;  /* not separated out until the 2.5.41 kernel */
   367   *cxxx = 0;  /* not separated out until the 2.6.0-test4 kernel */
   368   *cyyy = 0;  /* not separated out until the 2.6.0-test4 kernel */
   369
   370   b = strstr(buff, "cpu ");
   371   if(b) sscanf(b,  "cpu  %Lu %Lu %Lu %Lu %Lu %Lu %Lu", cuse, cice, csys, cide, ciow, cxxx, c
   371 yyy);
   372
   373   b = strstr(buff, "page ");
   374   if(b) sscanf(b,  "page %lu %lu", pin, pout);
   375   else need_vmstat_file = 1;
   376
   377   b = strstr(buff, "swap ");
   378   if(b) sscanf(b,  "swap %lu %lu", s_in, sout);
   379   else need_vmstat_file = 1;
   380
   381   b = strstr(buff, "intr ");
   382   if(b) sscanf(b,  "intr %Lu", &llbuf);
   383   *intr = llbuf;
   384
   385   b = strstr(buff, "ctxt ");
   386   if(b) sscanf(b,  "ctxt %Lu", &llbuf);
   387   *ctxt = llbuf;
   388
   389   b = strstr(buff, "btime ");
   390   if(b) sscanf(b,  "btime %u", btime);
   391
   392   b = strstr(buff, "processes ");
   393   if(b) sscanf(b,  "processes %u", processes);
   394
   395   b = strstr(buff, "procs_running ");
   396   if(b) sscanf(b,  "procs_running %u", running);
   397   else need_proc_scan = 1;
   398
   399   b = strstr(buff, "procs_blocked ");
   400   if(b) sscanf(b,  "procs_blocked %u", blocked);
   401   else need_proc_scan = 1;
   402
   403   if(need_proc_scan){   /* Linux 2.5.46 (approximately) and below */
   404     getrunners(running, blocked);
   405   }
   406
   407   (*running)--;   // exclude vmstat itself
   408
   409   if(need_vmstat_file){  /* Linux 2.5.40-bk4 and above */
   410     vminfo();
   411     *pin  = vm_pgpgin;
   412     *pout = vm_pgpgout;
   413     *s_in = vm_pswpin;
   414     *sout = vm_pswpout;
   415   }
   416 }