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3f3b1a59ad
procps/proc/sysinfo.c
Jaromir Capik 3f3b1a59ad library: MemAvailable fallback now uses /proc/meminfo 
Taking the values from /proc/vmstat was unnecessary
and prone to race conditions.
2014-07-31 15:10:42 +02:00

1076 lines
37 KiB
C
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/*
* File for parsing top-level /proc entities.
* Copyright (C) 1992-1998 by Michael K. Johnson, johnsonm@redhat.com
* Copyright 1998-2003 Albert Cahalan
* June 2003, Fabian Frederick, disk and slab info
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <locale.h>
#include <unistd.h>
#include <fcntl.h>
#include "alloc.h"
#include "version.h"
#include "sysinfo.h" /* include self to verify prototypes */
#ifndef HZ
#include <netinet/in.h> /* htons */
#endif
long smp_num_cpus; /* number of CPUs */
long page_bytes; /* this architecture's page size */
#define BAD_OPEN_MESSAGE \
"Error: /proc must be mounted\n" \
" To mount /proc at boot you need an /etc/fstab line like:\n" \
" proc /proc proc defaults\n" \
" In the meantime, run \"mount proc /proc -t proc\"\n"
#define STAT_FILE "/proc/stat"
static int stat_fd = -1;
#define UPTIME_FILE "/proc/uptime"
static int uptime_fd = -1;
#define LOADAVG_FILE "/proc/loadavg"
static int loadavg_fd = -1;
#define MEMINFO_FILE "/proc/meminfo"
static int meminfo_fd = -1;
#define VMINFO_FILE "/proc/vmstat"
static int vminfo_fd = -1;
#define VM_MIN_FREE_FILE "/proc/sys/vm/min_free_kbytes"
static int vm_min_free_fd = -1;
// As of 2.6.24 /proc/meminfo seems to need 888 on 64-bit,
// and would need 1258 if the obsolete fields were there.
// As of 3.13 /proc/vmstat needs 2623,
// and /proc/stat needs 3076.
static char buf[8192];
/* This macro opens filename only if necessary and seeks to 0 so
* that successive calls to the functions are more efficient.
* It also reads the current contents of the file into the global buf.
*/
#define FILE_TO_BUF(filename, fd) do{ \
static int local_n; \
if (fd == -1 && (fd = open(filename, O_RDONLY)) == -1) { \
fputs(BAD_OPEN_MESSAGE, stderr); \
fflush(NULL); \
_exit(102); \
} \
lseek(fd, 0L, SEEK_SET); \
if ((local_n = read(fd, buf, sizeof buf - 1)) < 0) { \
perror(filename); \
fflush(NULL); \
_exit(103); \
} \
buf[local_n] = '\0'; \
}while(0)
/* evals 'x' twice */
#define SET_IF_DESIRED(x,y) do{ if(x) *(x) = (y); }while(0)
/* return minimum of two values */
#define MIN(x,y) ((x) < (y) ? (x) : (y))
/***********************************************************************/
int uptime(double *restrict uptime_secs, double *restrict idle_secs) {
double up=0, idle=0;
char *savelocale;
FILE_TO_BUF(UPTIME_FILE,uptime_fd);
savelocale = strdup(setlocale(LC_NUMERIC, NULL));
setlocale(LC_NUMERIC,"C");
if (sscanf(buf, "%lf %lf", &up, &idle) < 2) {
setlocale(LC_NUMERIC,savelocale);
free(savelocale);
fputs("bad data in " UPTIME_FILE "\n", stderr);
return 0;
}
setlocale(LC_NUMERIC,savelocale);
free(savelocale);
SET_IF_DESIRED(uptime_secs, up);
SET_IF_DESIRED(idle_secs, idle);
return up; /* assume never be zero seconds in practice */
}
unsigned long getbtime(void) {
static unsigned long btime = 0;
bool found_btime = false;
FILE *f;
if (btime)
return btime;
/* /proc/stat can get very large on multi-CPU systems so we
can't use FILE_TO_BUF */
if (!(f = fopen(STAT_FILE, "r"))) {
fputs(BAD_OPEN_MESSAGE, stderr);
fflush(NULL);
_exit(102);
}
while ((fgets(buf, sizeof buf, f))) {
if (sscanf(buf, "btime %lu", &btime) == 1) {
found_btime = true;
break;
}
}
fclose(f);
if (!found_btime) {
fputs("missing btime in " STAT_FILE "\n", stderr);
exit(1);
}
return btime;
}
/***********************************************************************
* Some values in /proc are expressed in units of 1/HZ seconds, where HZ
* is the kernel clock tick rate. One of these units is called a jiffy.
* The HZ value used in the kernel may vary according to hacker desire.
* According to Linus Torvalds, this is not true. He considers the values
* in /proc as being in architecture-dependant units that have no relation
* to the kernel clock tick rate. Examination of the kernel source code
* reveals that opinion as wishful thinking.
*
* In any case, we need the HZ constant as used in /proc. (the real HZ value
* may differ, but we don't care) There are several ways we could get HZ:
*
* 1. Include the kernel header file. If it changes, recompile this library.
* 2. Use the sysconf() function. When HZ changes, recompile the C library!
* 3. Ask the kernel. This is obviously correct...
*
* Linus Torvalds won't let us ask the kernel, because he thinks we should
* not know the HZ value. Oh well, we don't have to listen to him.
* Someone smuggled out the HZ value. :-)
*
* This code should work fine, even if Linus fixes the kernel to match his
* stated behavior. The code only fails in case of a partial conversion.
*
* Recent update: on some architectures, the 2.4 kernel provides an
* ELF note to indicate HZ. This may be for ARM or user-mode Linux
* support. This ought to be investigated. Note that sysconf() is still
* unreliable, because it doesn't return an error code when it is
* used with a kernel that doesn't support the ELF note. On some other
* architectures there may be a system call or sysctl() that will work.
*/
unsigned long long Hertz;
static void old_Hertz_hack(void){
unsigned long long user_j, nice_j, sys_j, other_j, wait_j, hirq_j, sirq_j, stol_j; /* jiffies (clock ticks) */
double up_1, up_2, seconds;
unsigned long long jiffies;
unsigned h;
char *savelocale;
long hz;
#ifdef _SC_CLK_TCK
if((hz = sysconf(_SC_CLK_TCK)) > 0){
Hertz = hz;
return;
}
#endif
wait_j = hirq_j = sirq_j = stol_j = 0;
savelocale = strdup(setlocale(LC_NUMERIC, NULL));
setlocale(LC_NUMERIC, "C");
do{
FILE_TO_BUF(UPTIME_FILE,uptime_fd); sscanf(buf, "%lf", &up_1);
/* uptime(&up_1, NULL); */
FILE_TO_BUF(STAT_FILE,stat_fd);
sscanf(buf, "cpu %Lu %Lu %Lu %Lu %Lu %Lu %Lu %Lu", &user_j, &nice_j, &sys_j, &other_j, &wait_j, &hirq_j, &sirq_j, &stol_j);
FILE_TO_BUF(UPTIME_FILE,uptime_fd); sscanf(buf, "%lf", &up_2);
/* uptime(&up_2, NULL); */
} while((long long)( (up_2-up_1)*1000.0/up_1 )); /* want under 0.1% error */
setlocale(LC_NUMERIC, savelocale);
free(savelocale);
jiffies = user_j + nice_j + sys_j + other_j + wait_j + hirq_j + sirq_j + stol_j ;
seconds = (up_1 + up_2) / 2;
h = (unsigned)( (double)jiffies/seconds/smp_num_cpus );
/* actual values used by 2.4 kernels: 32 64 100 128 1000 1024 1200 */
switch(h){
case 9 ... 11 : Hertz = 10; break; /* S/390 (sometimes) */
case 18 ... 22 : Hertz = 20; break; /* user-mode Linux */
case 30 ... 34 : Hertz = 32; break; /* ia64 emulator */
case 48 ... 52 : Hertz = 50; break;
case 58 ... 61 : Hertz = 60; break;
case 62 ... 65 : Hertz = 64; break; /* StrongARM /Shark */
case 95 ... 105 : Hertz = 100; break; /* normal Linux */
case 124 ... 132 : Hertz = 128; break; /* MIPS, ARM */
case 195 ... 204 : Hertz = 200; break; /* normal << 1 */
case 247 ... 252 : Hertz = 250; break;
case 253 ... 260 : Hertz = 256; break;
case 393 ... 408 : Hertz = 400; break; /* normal << 2 */
case 790 ... 808 : Hertz = 800; break; /* normal << 3 */
case 990 ... 1010 : Hertz = 1000; break; /* ARM */
case 1015 ... 1035 : Hertz = 1024; break; /* Alpha, ia64 */
case 1180 ... 1220 : Hertz = 1200; break; /* Alpha */
default:
#ifdef HZ
Hertz = (unsigned long long)HZ; /* <asm/param.h> */
#else
/* If 32-bit or big-endian (not Alpha or ia64), assume HZ is 100. */
Hertz = (sizeof(long)==sizeof(int) || htons(999)==999) ? 100UL : 1024UL;
#endif
fprintf(stderr, "Unknown HZ value! (%d) Assume %Ld.\n", h, Hertz);
}
}
// same as: euid != uid || egid != gid
#ifndef AT_SECURE
#define AT_SECURE 23 // secure mode boolean (true if setuid, etc.)
#endif
#ifndef AT_CLKTCK
#define AT_CLKTCK 17 // frequency of times()
#endif
#define NOTE_NOT_FOUND 42
extern char** environ;
/* for ELF executables, notes are pushed before environment and args */
static unsigned long find_elf_note(unsigned long findme){
unsigned long *ep = (unsigned long *)environ;
while(*ep++);
while(*ep){
if(ep[0]==findme) return ep[1];
ep+=2;
}
return NOTE_NOT_FOUND;
}
int have_privs;
static int check_for_privs(void){
unsigned long rc = find_elf_note(AT_SECURE);
if(rc==NOTE_NOT_FOUND){
// not valid to run this code after UID or GID change!
// (if needed, may use AT_UID and friends instead)
rc = geteuid() != getuid() || getegid() != getgid();
}
return !!rc;
}
static void init_libproc(void) __attribute__((constructor));
static void init_libproc(void){
have_privs = check_for_privs();
init_Linux_version(); /* Must be called before we check code */
cpuinfo();
page_bytes = sysconf(_SC_PAGESIZE);
#ifdef __linux__
if(linux_version_code > LINUX_VERSION(2, 4, 0)){
Hertz = find_elf_note(AT_CLKTCK);
if(Hertz!=NOTE_NOT_FOUND) return;
// fputs("2.4+ kernel w/o ELF notes? -- report this\n", stderr);
}
#endif /* __linux __ */
#if defined(__FreeBSD_kernel__) || defined(__FreeBSD__)
/* On FreeBSD the Hertz hack is unrelaible, there is no ELF note and
* Hertz isn't defined in asm/params.h
* See Debian Bug #460331
*/
Hertz = 100;
return;
#endif /* __FreeBSD__ */
old_Hertz_hack();
}
#if 0
/***********************************************************************
* The /proc filesystem calculates idle=jiffies-(user+nice+sys) and we
* recover jiffies by adding up the 4 or 5 numbers we are given. SMP kernels
* (as of pre-2.4 era) can report idle time going backwards, perhaps due
* to non-atomic reads and updates. There is no locking for these values.
*/
#ifndef NAN
#define NAN (-0.0)
#endif
#define JT unsigned long long
void eight_cpu_numbers(double *restrict uret, double *restrict nret, double *restrict sret, double *restrict iret, double *restrict wret, double *restrict xret, double *restrict yret, double *restrict zret){
double tmp_u, tmp_n, tmp_s, tmp_i, tmp_w, tmp_x, tmp_y, tmp_z;
double scale; /* scale values to % */
static JT old_u, old_n, old_s, old_i, old_w, old_x, old_y, old_z;
JT new_u, new_n, new_s, new_i, new_w, new_x, new_y, new_z;
JT ticks_past; /* avoid div-by-0 by not calling too often :-( */
tmp_w = 0.0;
new_w = 0;
tmp_x = 0.0;
new_x = 0;
tmp_y = 0.0;
new_y = 0;
tmp_z = 0.0;
new_z = 0;
FILE_TO_BUF(STAT_FILE,stat_fd);
sscanf(buf, "cpu %Lu %Lu %Lu %Lu %Lu %Lu %Lu %Lu", &new_u, &new_n, &new_s, &new_i, &new_w, &new_x, &new_y, &new_z);
ticks_past = (new_u+new_n+new_s+new_i+new_w+new_x+new_y+new_z)-(old_u+old_n+old_s+old_i+old_w+old_x+old_y+old_z);
if(ticks_past){
scale = 100.0 / (double)ticks_past;
tmp_u = ( (double)new_u - (double)old_u ) * scale;
tmp_n = ( (double)new_n - (double)old_n ) * scale;
tmp_s = ( (double)new_s - (double)old_s ) * scale;
tmp_i = ( (double)new_i - (double)old_i ) * scale;
tmp_w = ( (double)new_w - (double)old_w ) * scale;
tmp_x = ( (double)new_x - (double)old_x ) * scale;
tmp_y = ( (double)new_y - (double)old_y ) * scale;
tmp_z = ( (double)new_z - (double)old_z ) * scale;
}else{
tmp_u = NAN;
tmp_n = NAN;
tmp_s = NAN;
tmp_i = NAN;
tmp_w = NAN;
tmp_x = NAN;
tmp_y = NAN;
tmp_z = NAN;
}
SET_IF_DESIRED(uret, tmp_u);
SET_IF_DESIRED(nret, tmp_n);
SET_IF_DESIRED(sret, tmp_s);
SET_IF_DESIRED(iret, tmp_i);
SET_IF_DESIRED(wret, tmp_w);
SET_IF_DESIRED(xret, tmp_x);
SET_IF_DESIRED(yret, tmp_y);
SET_IF_DESIRED(zret, tmp_z);
old_u=new_u;
old_n=new_n;
old_s=new_s;
old_i=new_i;
old_w=new_w;
old_x=new_x;
old_y=new_y;
old_z=new_z;
}
#undef JT
#endif
/***********************************************************************/
void loadavg(double *restrict av1, double *restrict av5, double *restrict av15) {
double avg_1=0, avg_5=0, avg_15=0;
char *savelocale;
FILE_TO_BUF(LOADAVG_FILE,loadavg_fd);
savelocale = strdup(setlocale(LC_NUMERIC, NULL));
setlocale(LC_NUMERIC, "C");
if (sscanf(buf, "%lf %lf %lf", &avg_1, &avg_5, &avg_15) < 3) {
fputs("bad data in " LOADAVG_FILE "\n", stderr);
free(savelocale);
exit(1);
}
setlocale(LC_NUMERIC, savelocale);
free(savelocale);
SET_IF_DESIRED(av1, avg_1);
SET_IF_DESIRED(av5, avg_5);
SET_IF_DESIRED(av15, avg_15);
}
static char buff[BUFFSIZE]; /* used in the procedures */
/***********************************************************************/
static void crash(const char *filename) {
perror(filename);
exit(EXIT_FAILURE);
}
/***********************************************************************/
static void getrunners(unsigned int *restrict running, unsigned int *restrict blocked) {
struct direct *ent;
DIR *proc;
*running=0;
*blocked=0;
if((proc=opendir("/proc"))==NULL) crash("/proc");
while(( ent=readdir(proc) )) {
char tbuf[32];
char *cp;
int fd;
char c;
if (!isdigit(ent->d_name[0])) continue;
sprintf(tbuf, "/proc/%s/stat", ent->d_name);
fd = open(tbuf, O_RDONLY, 0);
if (fd == -1) continue;
memset(tbuf, '\0', sizeof tbuf); // didn't feel like checking read()
read(fd, tbuf, sizeof tbuf - 1); // need 32 byte buffer at most
close(fd);
cp = strrchr(tbuf, ')');
if(!cp) continue;
c = cp[2];
if (c=='R') {
(*running)++;
continue;
}
if (c=='D') {
(*blocked)++;
continue;
}
}
closedir(proc);
}
/***********************************************************************/
void getstat(jiff *restrict cuse, jiff *restrict cice, jiff *restrict csys, jiff *restrict cide, jiff *restrict ciow, jiff *restrict cxxx, jiff *restrict cyyy, jiff *restrict czzz,
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) {
static int fd;
unsigned long long llbuf = 0;
int need_vmstat_file = 0;
int need_proc_scan = 0;
const char* b;
buff[BUFFSIZE-1] = 0; /* ensure null termination in buffer */
if(fd){
lseek(fd, 0L, SEEK_SET);
}else{
fd = open("/proc/stat", O_RDONLY, 0);
if(fd == -1) crash("/proc/stat");
}
read(fd,buff,BUFFSIZE-1);
*intr = 0;
*ciow = 0; /* not separated out until the 2.5.41 kernel */
*cxxx = 0; /* not separated out until the 2.6.0-test4 kernel */
*cyyy = 0; /* not separated out until the 2.6.0-test4 kernel */
*czzz = 0; /* not separated out until the 2.6.11 kernel */
b = strstr(buff, "cpu ");
if(b) sscanf(b, "cpu %Lu %Lu %Lu %Lu %Lu %Lu %Lu %Lu", cuse, cice, csys, cide, ciow, cxxx, cyyy, czzz);
b = strstr(buff, "page ");
if(b) sscanf(b, "page %lu %lu", pin, pout);
else need_vmstat_file = 1;
b = strstr(buff, "swap ");
if(b) sscanf(b, "swap %lu %lu", s_in, sout);
else need_vmstat_file = 1;
b = strstr(buff, "intr ");
if(b) sscanf(b, "intr %Lu", &llbuf);
*intr = llbuf;
b = strstr(buff, "ctxt ");
if(b) sscanf(b, "ctxt %Lu", &llbuf);
*ctxt = llbuf;
b = strstr(buff, "btime ");
if(b) sscanf(b, "btime %u", btime);
b = strstr(buff, "processes ");
if(b) sscanf(b, "processes %u", processes);
b = strstr(buff, "procs_running ");
if(b) sscanf(b, "procs_running %u", running);
else need_proc_scan = 1;
b = strstr(buff, "procs_blocked ");
if(b) sscanf(b, "procs_blocked %u", blocked);
else need_proc_scan = 1;
if(need_proc_scan){ /* Linux 2.5.46 (approximately) and below */
getrunners(running, blocked);
}
if(*running)
(*running)--; // exclude vmstat itself
if(need_vmstat_file){ /* Linux 2.5.40-bk4 and above */
vminfo();
*pin = vm_pgpgin;
*pout = vm_pgpgout;
*s_in = vm_pswpin;
*sout = vm_pswpout;
}
}
/***********************************************************************/
/*
* Copyright 1999 by Albert Cahalan; all rights reserved.
* This file may be used subject to the terms and conditions of the
* GNU Library General Public License Version 2, or any later version
* at your option, as published by the Free Software Foundation.
* 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 Library General Public License for more details.
*/
typedef struct mem_table_struct {
const char *name; /* memory type name */
unsigned long *slot; /* slot in return struct */
} mem_table_struct;
static int compare_mem_table_structs(const void *a, const void *b){
return strcmp(((const mem_table_struct*)a)->name,((const mem_table_struct*)b)->name);
}
/* example data, following junk, with comments added:
*
* MemTotal: 61768 kB old
* MemFree: 1436 kB old
* Buffers: 1312 kB old
* Cached: 20932 kB old
* Active: 12464 kB new
* Inact_dirty: 7772 kB new
* Inact_clean: 2008 kB new
* Inact_target: 0 kB new
* Inact_laundry: 0 kB new, and might be missing too
* HighTotal: 0 kB
* HighFree: 0 kB
* LowTotal: 61768 kB
* LowFree: 1436 kB
* SwapTotal: 122580 kB old
* SwapFree: 60352 kB old
* Inactive: 20420 kB 2.5.41+
* Dirty: 0 kB 2.5.41+
* Writeback: 0 kB 2.5.41+
* Mapped: 9792 kB 2.5.41+
* Shmem: 28 kB 2.6.32+
* Slab: 4564 kB 2.5.41+
* Committed_AS: 8440 kB 2.5.41+
* PageTables: 304 kB 2.5.41+
* ReverseMaps: 5738 2.5.41+
* SwapCached: 0 kB 2.5.??+
* HugePages_Total: 220 2.5.??+
* HugePages_Free: 138 2.5.??+
* Hugepagesize: 4096 kB 2.5.??+
*/
/* Shmem in 2.6.32+ */
unsigned long kb_main_shared;
/* old but still kicking -- the important stuff */
unsigned long kb_main_buffers;
unsigned long kb_main_cached;
unsigned long kb_main_free;
unsigned long kb_main_total;
unsigned long kb_swap_free;
unsigned long kb_swap_total;
/* recently introduced */
unsigned long kb_high_free;
unsigned long kb_high_total;
unsigned long kb_low_free;
unsigned long kb_low_total;
unsigned long kb_main_available;
/* 2.4.xx era */
unsigned long kb_active;
unsigned long kb_inact_laundry;
unsigned long kb_inact_dirty;
unsigned long kb_inact_clean;
unsigned long kb_inact_target;
unsigned long kb_swap_cached; /* late 2.4 and 2.6+ only */
/* derived values */
unsigned long kb_swap_used;
unsigned long kb_main_used;
/* 2.5.41+ */
unsigned long kb_writeback;
unsigned long kb_slab;
unsigned long nr_reversemaps;
unsigned long kb_committed_as;
unsigned long kb_dirty;
unsigned long kb_inactive;
unsigned long kb_mapped;
unsigned long kb_pagetables;
// seen on a 2.6.x kernel:
static unsigned long kb_vmalloc_chunk;
static unsigned long kb_vmalloc_total;
static unsigned long kb_vmalloc_used;
// seen on 2.6.24-rc6-git12
static unsigned long kb_anon_pages;
static unsigned long kb_bounce;
static unsigned long kb_commit_limit;
static unsigned long kb_nfs_unstable;
// seen on 2.6.18
static unsigned long kb_min_free;
// 2.6.19+
static unsigned long kb_slab_reclaimable;
static unsigned long kb_slab_unreclaimable;
// 2.6.27+
static unsigned long kb_active_file;
static unsigned long kb_inactive_file;
void meminfo(void){
char namebuf[16]; /* big enough to hold any row name */
mem_table_struct findme = { namebuf, NULL};
mem_table_struct *found;
char *head;
char *tail;
static const mem_table_struct mem_table[] = {
{"Active", &kb_active}, // important
{"Active(file)", &kb_active_file},
{"AnonPages", &kb_anon_pages},
{"Bounce", &kb_bounce},
{"Buffers", &kb_main_buffers}, // important
{"Cached", &kb_main_cached}, // important
{"CommitLimit", &kb_commit_limit},
{"Committed_AS", &kb_committed_as},
{"Dirty", &kb_dirty}, // kB version of vmstat nr_dirty
{"HighFree", &kb_high_free},
{"HighTotal", &kb_high_total},
{"Inact_clean", &kb_inact_clean},
{"Inact_dirty", &kb_inact_dirty},
{"Inact_laundry",&kb_inact_laundry},
{"Inact_target", &kb_inact_target},
{"Inactive", &kb_inactive}, // important
{"Inactive(file)",&kb_inactive_file},
{"LowFree", &kb_low_free},
{"LowTotal", &kb_low_total},
{"Mapped", &kb_mapped}, // kB version of vmstat nr_mapped
{"MemAvailable", &kb_main_available}, // important
{"MemFree", &kb_main_free}, // important
{"MemTotal", &kb_main_total}, // important
{"NFS_Unstable", &kb_nfs_unstable},
{"PageTables", &kb_pagetables}, // kB version of vmstat nr_page_table_pages
{"ReverseMaps", &nr_reversemaps}, // same as vmstat nr_page_table_pages
{"SReclaimable", &kb_slab_reclaimable}, // "slab reclaimable" (dentry and inode structures)
{"SUnreclaim", &kb_slab_unreclaimable},
{"Shmem", &kb_main_shared}, // kernel 2.6.32 and later
{"Slab", &kb_slab}, // kB version of vmstat nr_slab
{"SwapCached", &kb_swap_cached},
{"SwapFree", &kb_swap_free}, // important
{"SwapTotal", &kb_swap_total}, // important
{"VmallocChunk", &kb_vmalloc_chunk},
{"VmallocTotal", &kb_vmalloc_total},
{"VmallocUsed", &kb_vmalloc_used},
{"Writeback", &kb_writeback}, // kB version of vmstat nr_writeback
};
const int mem_table_count = sizeof(mem_table)/sizeof(mem_table_struct);
unsigned long watermark_low;
signed long mem_available;
FILE_TO_BUF(MEMINFO_FILE,meminfo_fd);
kb_inactive = ~0UL;
kb_low_total = kb_main_available = 0;
head = buf;
for(;;){
tail = strchr(head, ':');
if(!tail) break;
*tail = '\0';
if(strlen(head) >= sizeof(namebuf)){
head = tail+1;
goto nextline;
}
strcpy(namebuf,head);
found = bsearch(&findme, mem_table, mem_table_count,
sizeof(mem_table_struct), compare_mem_table_structs
);
head = tail+1;
if(!found) goto nextline;
*(found->slot) = (unsigned long)strtoull(head,&tail,10);
nextline:
tail = strchr(head, '\n');
if(!tail) break;
head = tail+1;
}
if(!kb_low_total){ /* low==main except with large-memory support */
kb_low_total = kb_main_total;
kb_low_free = kb_main_free;
}
if(kb_inactive==~0UL){
kb_inactive = kb_inact_dirty + kb_inact_clean + kb_inact_laundry;
}
kb_swap_used = kb_swap_total - kb_swap_free;
kb_main_used = kb_main_total - kb_main_free;
/* zero? might need fallback for 2.6.27 <= kernel <? 3.14 */
if (!kb_main_available) {
if (linux_version_code < LINUX_VERSION(2, 6, 27))
kb_main_available = kb_main_free;
else {
FILE_TO_BUF(VM_MIN_FREE_FILE, vm_min_free_fd);
kb_min_free = (unsigned long) strtoull(buf,&tail,10);
watermark_low = kb_min_free * 5 / 4; /* should be equal to sum of all 'low' fields in /proc/zoneinfo */
mem_available = (signed long)kb_main_free - watermark_low
+ kb_inactive_file + kb_active_file - MIN((kb_inactive_file + kb_active_file) / 2, watermark_low)
+ kb_slab_reclaimable - MIN(kb_slab_reclaimable / 2, watermark_low);
if (mem_available < 0) mem_available = 0;
kb_main_available = (unsigned long)mem_available;
}
}
}
/*****************************************************************/
/* read /proc/vminfo only for 2.5.41 and above */
typedef struct vm_table_struct {
const char *name; /* VM statistic name */
unsigned long *slot; /* slot in return struct */
} vm_table_struct;
static int compare_vm_table_structs(const void *a, const void *b){
return strcmp(((const vm_table_struct*)a)->name,((const vm_table_struct*)b)->name);
}
// see include/linux/page-flags.h and mm/page_alloc.c
unsigned long vm_nr_dirty; // dirty writable pages
unsigned long vm_nr_writeback; // pages under writeback
unsigned long vm_nr_pagecache; // pages in pagecache -- gone in 2.5.66+ kernels
unsigned long vm_nr_page_table_pages;// pages used for pagetables
unsigned long vm_nr_reverse_maps; // includes PageDirect
unsigned long vm_nr_mapped; // mapped into pagetables
unsigned long vm_nr_slab; // in slab
unsigned long vm_nr_slab_reclaimable; // 2.6.19+ kernels
unsigned long vm_nr_slab_unreclaimable;// 2.6.19+ kernels
unsigned long vm_nr_active_file; // 2.6.27+ kernels
unsigned long vm_nr_inactive_file; // 2.6.27+ kernels
unsigned long vm_nr_free_pages; // 2.6.21+ kernels
unsigned long vm_pgpgin; // kB disk reads (same as 1st num on /proc/stat page line)
unsigned long vm_pgpgout; // kB disk writes (same as 2nd num on /proc/stat page line)
unsigned long vm_pswpin; // swap reads (same as 1st num on /proc/stat swap line)
unsigned long vm_pswpout; // swap writes (same as 2nd num on /proc/stat swap line)
unsigned long vm_pgalloc; // page allocations
unsigned long vm_pgfree; // page freeings
unsigned long vm_pgactivate; // pages moved inactive -> active
unsigned long vm_pgdeactivate; // pages moved active -> inactive
unsigned long vm_pgfault; // total faults (major+minor)
unsigned long vm_pgmajfault; // major faults
unsigned long vm_pgscan; // pages scanned by page reclaim
unsigned long vm_pgrefill; // inspected by refill_inactive_zone
unsigned long vm_pgsteal; // total pages reclaimed
unsigned long vm_kswapd_steal; // pages reclaimed by kswapd
// next 3 as defined by the 2.5.52 kernel
unsigned long vm_pageoutrun; // times kswapd ran page reclaim
unsigned long vm_allocstall; // times a page allocator ran direct reclaim
unsigned long vm_pgrotated; // pages rotated to the tail of the LRU for immediate reclaim
// seen on a 2.6.8-rc1 kernel, apparently replacing old fields
static unsigned long vm_pgalloc_dma; //
static unsigned long vm_pgalloc_high; //
static unsigned long vm_pgalloc_normal; //
static unsigned long vm_pgrefill_dma; //
static unsigned long vm_pgrefill_high; //
static unsigned long vm_pgrefill_normal; //
static unsigned long vm_pgscan_direct_dma; //
static unsigned long vm_pgscan_direct_high; //
static unsigned long vm_pgscan_direct_normal; //
static unsigned long vm_pgscan_kswapd_dma; //
static unsigned long vm_pgscan_kswapd_high; //
static unsigned long vm_pgscan_kswapd_normal; //
static unsigned long vm_pgsteal_dma; //
static unsigned long vm_pgsteal_high; //
static unsigned long vm_pgsteal_normal; //
// seen on a 2.6.8-rc1 kernel
static unsigned long vm_kswapd_inodesteal; //
static unsigned long vm_nr_unstable; //
static unsigned long vm_pginodesteal; //
static unsigned long vm_slabs_scanned; //
void vminfo(void){
char namebuf[32]; /* big enough to hold any row name */
vm_table_struct findme = { namebuf, NULL};
vm_table_struct *found;
char *head;
char *tail;
static const vm_table_struct vm_table[] = {
{"allocstall", &vm_allocstall},
{"kswapd_inodesteal", &vm_kswapd_inodesteal},
{"kswapd_steal", &vm_kswapd_steal},
{"nr_active_file", &vm_nr_active_file}, // 2.6.27+ kernels
{"nr_dirty", &vm_nr_dirty}, // page version of meminfo Dirty
{"nr_free_pages", &vm_nr_free_pages}, // 2.6.21+ kernels
{"nr_inactive_file", &vm_nr_inactive_file}, // 2.6.27+ kernels
{"nr_mapped", &vm_nr_mapped}, // page version of meminfo Mapped
{"nr_page_table_pages", &vm_nr_page_table_pages},// same as meminfo PageTables
{"nr_pagecache", &vm_nr_pagecache}, // gone in 2.5.66+ kernels
{"nr_reverse_maps", &vm_nr_reverse_maps}, // page version of meminfo ReverseMaps GONE
{"nr_slab", &vm_nr_slab}, // page version of meminfo Slab (gone in 2.6.19+)
{"nr_slab_reclaimable", &vm_nr_slab_reclaimable},// 2.6.19+ kernels
{"nr_slab_unreclaimable",&vm_nr_slab_unreclaimable},// 2.6.19+ kernels
{"nr_unstable", &vm_nr_unstable},
{"nr_writeback", &vm_nr_writeback}, // page version of meminfo Writeback
{"pageoutrun", &vm_pageoutrun},
{"pgactivate", &vm_pgactivate},
{"pgalloc", &vm_pgalloc}, // GONE (now separate dma,high,normal)
{"pgalloc_dma", &vm_pgalloc_dma},
{"pgalloc_high", &vm_pgalloc_high},
{"pgalloc_normal", &vm_pgalloc_normal},
{"pgdeactivate", &vm_pgdeactivate},
{"pgfault", &vm_pgfault},
{"pgfree", &vm_pgfree},
{"pginodesteal", &vm_pginodesteal},
{"pgmajfault", &vm_pgmajfault},
{"pgpgin", &vm_pgpgin}, // important
{"pgpgout", &vm_pgpgout}, // important
{"pgrefill", &vm_pgrefill}, // GONE (now separate dma,high,normal)
{"pgrefill_dma", &vm_pgrefill_dma},
{"pgrefill_high", &vm_pgrefill_high},
{"pgrefill_normal", &vm_pgrefill_normal},
{"pgrotated", &vm_pgrotated},
{"pgscan", &vm_pgscan}, // GONE (now separate direct,kswapd and dma,high,normal)
{"pgscan_direct_dma", &vm_pgscan_direct_dma},
{"pgscan_direct_high", &vm_pgscan_direct_high},
{"pgscan_direct_normal",&vm_pgscan_direct_normal},
{"pgscan_kswapd_dma", &vm_pgscan_kswapd_dma},
{"pgscan_kswapd_high", &vm_pgscan_kswapd_high},
{"pgscan_kswapd_normal",&vm_pgscan_kswapd_normal},
{"pgsteal", &vm_pgsteal}, // GONE (now separate dma,high,normal)
{"pgsteal_dma", &vm_pgsteal_dma},
{"pgsteal_high", &vm_pgsteal_high},
{"pgsteal_normal", &vm_pgsteal_normal},
{"pswpin", &vm_pswpin}, // important
{"pswpout", &vm_pswpout}, // important
{"slabs_scanned", &vm_slabs_scanned},
};
const int vm_table_count = sizeof(vm_table)/sizeof(vm_table_struct);
#if __SIZEOF_LONG__ == 4
unsigned long long slotll;
#endif
vm_pgalloc = 0;
vm_pgrefill = 0;
vm_pgscan = 0;
vm_pgsteal = 0;
FILE_TO_BUF(VMINFO_FILE,vminfo_fd);
head = buf;
for(;;){
tail = strchr(head, ' ');
if(!tail) break;
*tail = '\0';
if(strlen(head) >= sizeof(namebuf)){
head = tail+1;
goto nextline;
}
strcpy(namebuf,head);
found = bsearch(&findme, vm_table, vm_table_count,
sizeof(vm_table_struct), compare_vm_table_structs
);
head = tail+1;
if(!found) goto nextline;
#if __SIZEOF_LONG__ == 4
// A 32 bit kernel would have already truncated the value, a 64 bit kernel
// doesn't need to. Truncate here to let 32 bit programs to continue to get
// truncated values. It's that or change the API for a larger data type.
slotll = strtoull(head,&tail,10);
*(found->slot) = (unsigned long)slotll;
#else
*(found->slot) = strtoul(head,&tail,10);
#endif
nextline:
//if(found) fprintf(stderr,"%s=%d\n",found->name,*(found->slot));
//else fprintf(stderr,"%s not found\n",findme.name);
tail = strchr(head, '\n');
if(!tail) break;
head = tail+1;
}
if(!vm_pgalloc)
vm_pgalloc = vm_pgalloc_dma + vm_pgalloc_high + vm_pgalloc_normal;
if(!vm_pgrefill)
vm_pgrefill = vm_pgrefill_dma + vm_pgrefill_high + vm_pgrefill_normal;
if(!vm_pgscan)
vm_pgscan = vm_pgscan_direct_dma + vm_pgscan_direct_high + vm_pgscan_direct_normal
+ vm_pgscan_kswapd_dma + vm_pgscan_kswapd_high + vm_pgscan_kswapd_normal;
if(!vm_pgsteal)
vm_pgsteal = vm_pgsteal_dma + vm_pgsteal_high + vm_pgsteal_normal;
}
///////////////////////////////////////////////////////////////////////
// based on Fabian Frederick's /proc/diskstats parser
unsigned int getpartitions_num(struct disk_stat *disks, int ndisks){
int i=0;
int partitions=0;
for (i=0;i<ndisks;i++){
partitions+=disks[i].partitions;
}
return partitions;
}
/////////////////////////////////////////////////////////////////////////////
static int is_disk(char *dev)
{
char syspath[32];
char *slash;
while ((slash = strchr(dev, '/')))
*slash = '!';
snprintf(syspath, sizeof(syspath), "/sys/block/%s", dev);
return !(access(syspath, F_OK));
}
/////////////////////////////////////////////////////////////////////////////
unsigned int getdiskstat(struct disk_stat **disks, struct partition_stat **partitions){
FILE* fd;
int cDisk = 0;
int cPartition = 0;
int fields;
unsigned dummy;
char devname[32];
*disks = NULL;
*partitions = NULL;
buff[BUFFSIZE-1] = 0;
fd = fopen("/proc/diskstats", "rb");
if(!fd) crash("/proc/diskstats");
for (;;) {
if (!fgets(buff,BUFFSIZE-1,fd)){
fclose(fd);
break;
}
fields = sscanf(buff, " %*d %*d %15s %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u %u", devname, &dummy);
if (fields == 2 && is_disk(devname)){
(*disks) = xrealloc(*disks, (cDisk+1)*sizeof(struct disk_stat));
sscanf(buff, " %*d %*d %15s %u %u %llu %u %u %u %llu %u %u %u %u",
//&disk_major,
//&disk_minor,
(*disks)[cDisk].disk_name,
&(*disks)[cDisk].reads,
&(*disks)[cDisk].merged_reads,
&(*disks)[cDisk].reads_sectors,
&(*disks)[cDisk].milli_reading,
&(*disks)[cDisk].writes,
&(*disks)[cDisk].merged_writes,
&(*disks)[cDisk].written_sectors,
&(*disks)[cDisk].milli_writing,
&(*disks)[cDisk].inprogress_IO,
&(*disks)[cDisk].milli_spent_IO,
&(*disks)[cDisk].weighted_milli_spent_IO
);
(*disks)[cDisk].partitions=0;
cDisk++;
}else{
(*partitions) = xrealloc(*partitions, (cPartition+1)*sizeof(struct partition_stat));
fflush(stdout);
sscanf(buff, (fields == 2)
? " %*d %*d %15s %u %*u %llu %*u %u %*u %llu %*u %*u %*u %*u"
: " %*d %*d %15s %u %llu %u %llu",
//&part_major,
//&part_minor,
(*partitions)[cPartition].partition_name,
&(*partitions)[cPartition].reads,
&(*partitions)[cPartition].reads_sectors,
&(*partitions)[cPartition].writes,
&(*partitions)[cPartition].requested_writes
);
if (cDisk > 0) {
(*partitions)[cPartition++].parent_disk = cDisk-1;
(*disks)[cDisk-1].partitions++;
}
}
}
return cDisk;
}
/////////////////////////////////////////////////////////////////////////////
// based on Fabian Frederick's /proc/slabinfo parser
unsigned int getslabinfo (struct slab_cache **slab){
FILE* fd;
int cSlab = 0;
buff[BUFFSIZE-1] = 0;
*slab = NULL;
fd = fopen("/proc/slabinfo", "rb");
if(!fd) crash("/proc/slabinfo");
while (fgets(buff,BUFFSIZE-1,fd)){
if(!memcmp("slabinfo - version:",buff,19)) continue; // skip header
if(*buff == '#') continue; // skip comments
(*slab) = xrealloc(*slab, (cSlab+1)*sizeof(struct slab_cache));
sscanf(buff, "%47s %u %u %u %u", // allow 47; max seen is 24
(*slab)[cSlab].name,
&(*slab)[cSlab].active_objs,
&(*slab)[cSlab].num_objs,
&(*slab)[cSlab].objsize,
&(*slab)[cSlab].objperslab
) ;
cSlab++;
}
fclose(fd);
return cSlab;
}
///////////////////////////////////////////////////////////////////////////
unsigned get_pid_digits(void){
char pidbuf[24];
char *endp;
long rc;
int fd;
static unsigned ret;
if(ret) goto out;
ret = 5;
fd = open("/proc/sys/kernel/pid_max", O_RDONLY);
if(fd==-1) goto out;
rc = read(fd, pidbuf, sizeof pidbuf);
close(fd);
if(rc<3) goto out;
pidbuf[rc] = '\0';
rc = strtol(pidbuf,&endp,10);
if(rc<42) goto out;
if(*endp && *endp!='\n') goto out;
rc--; // the pid_max value is really the max PID plus 1
ret = 0;
while(rc){
rc /= 10;
ret++;
}
out:
return ret;
}
///////////////////////////////////////////////////////////////////////////
void cpuinfo (void) {
// ought to count CPUs in /proc/stat instead of relying
// on glibc, which foolishly tries to parse /proc/cpuinfo
// note: that may have been the case but now /proc/stat
// is the default source. parsing of /proc/cpuinfo
// only occurs if the open on /proc/stat fails
//
// SourceForge has an old Alpha running Linux 2.2.20 that
// appears to have a non-SMP kernel on a 2-way SMP box.
// _SC_NPROCESSORS_CONF returns 2, resulting in HZ=512
// _SC_NPROCESSORS_ONLN returns 1, which should work OK
smp_num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if (smp_num_cpus<1) /* SPARC glibc is buggy */
smp_num_cpus=1;
}
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