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-rw-r--r--lib/os_mon/c_src/cpu_sup.c455
1 files changed, 455 insertions, 0 deletions
diff --git a/lib/os_mon/c_src/cpu_sup.c b/lib/os_mon/c_src/cpu_sup.c
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+++ b/lib/os_mon/c_src/cpu_sup.c
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+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 1997-2009. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+/*
+ * CPU supervision
+ *
+ * Uses kstat library only available on Solaris 2
+ * Compile with: gcc -o cpu_sup cpu_sup.c -lkstat
+ *
+ * Use open_port({spawn,Prog},[stream]) to communicate.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#if defined(__sun__)
+#include <kstat.h>
+#endif
+
+#include <sys/sysinfo.h>
+#include <errno.h>
+
+#if defined(__linux__)
+#include <string.h> /* strlen */
+
+#define PROCSTAT "/proc/stat"
+#define BUFFERSIZE (256)
+typedef struct {
+ unsigned int id;
+ unsigned long long
+ /* total, */
+ user,
+ nice_user,
+ kernel,
+ idle,
+ io_wait,
+ hard_irq,
+ soft_irq,
+ steal;
+} cpu_t;
+
+#endif
+
+#define FD_IN (0)
+#define FD_OUT (1)
+#define FD_ERR (2)
+
+#define PING 'p'
+#define NPROCS 'n'
+#define AVG1 '1'
+#define AVG5 '5'
+#define AVG15 'f'
+#define UTIL 'u'
+#define QUIT 'q'
+
+
+#define CU_CPU_ID (0)
+#define CU_USER (1)
+#define CU_NICE_USER (2)
+#define CU_KERNEL (3)
+#define CU_IO_WAIT (4)
+#define CU_IDLE (5)
+#define CU_HARD_IRQ (6)
+#define CU_SOFT_IRQ (7)
+#define CU_STEAL (8)
+
+#define CU_VALUES (9)
+#define CU_KSTAT_VALUES (5)
+
+/*
+#define CU_FLG_CPU_ID (0 << 1)
+#define CU_FLG_USER (0 << 2)
+#define CU_FLG_NICE_USER (0 << 3)
+#define CU_FLG_KERNEL (0 << 4)
+#define CU_FLG_IO_WAIT (0 << 5)
+#define CU_FLG_IDLE (0 << 6)
+#define CU_FLG_HARD_IRQ (0 << 7)
+#define CU_FLG_SOFT_IRQ (0 << 8)
+#define CU_FLG_STEAL (0 << 9)
+*/
+
+/* util_measure
+ * In:
+ * unsigned int **result_vec
+ * int *result_sz
+ * Purpose:
+ * Retrieve CPU utilization
+ * result_vec has 2 + np*ne*2 entries where np is number_of_cpus
+ * |------|------|
+ * | np | ne |
+ * |------|------|
+ * |val_id| value| (One entry)
+ * |------|------|
+ * |val_id| value| (One entry)
+ * |------|------|
+ * ......
+ * |------|------|
+ * |val_id| value|
+ * |------|------|
+ * np = number of processors
+ * ne = number of entries per processor
+ */
+
+static void util_measure(unsigned int **result_vec, int *result_sz);
+
+static unsigned int misc_measure(char* name);
+static void send(unsigned int data);
+static void sendv(unsigned int data[], int ints);
+static void error(char* err_msg);
+
+#if defined(__sun__)
+static kstat_ctl_t *kstat_ctl;
+#endif
+
+#if defined(__linux__)
+static int processors_online() {
+ return (int)sysconf(_SC_NPROCESSORS_ONLN);
+}
+#endif
+
+int main(int argc, char** argv) {
+ char cmd;
+ int rc;
+ int sz;
+ unsigned int *rv;
+ unsigned int no_of_cpus = 0;
+
+#if defined(__sun__)
+ kstat_ctl = kstat_open();
+ if(!kstat_ctl)
+ error("Can't open header kstat");
+#endif
+
+#if defined(__linux__)
+ no_of_cpus = processors_online();
+ if ( (rv = (unsigned int*)malloc(sizeof(unsigned int)*(2 + 2*no_of_cpus*CU_VALUES))) == NULL) {
+ error("cpu_cup: malloc error");
+ }
+#endif
+
+ while(1) {
+
+ rc = read(FD_IN, &cmd, 1);
+ if (rc < 0) {
+ if (errno == EINTR)
+ continue;
+ error("Error reading from Erlang");
+ }
+
+ if(rc == 0)
+ error("Erlang has closed");
+
+ switch(cmd) {
+ case PING: send(4711); break;
+#if defined(__sun__)
+ case NPROCS: send(misc_measure("nproc")); break;
+ case AVG1: send(misc_measure("avenrun_1min")); break;
+ case AVG5: send(misc_measure("avenrun_5min")); break;
+ case AVG15: send(misc_measure("avenrun_15min")); break;
+#endif
+ case UTIL: util_measure(&rv,&sz); sendv(rv, sz); break;
+ case QUIT: free((void*)rv); return 0;
+ default: error("Bad command"); break;
+ }
+ }
+ return 0; /* supress warnings */
+}
+/* ---------------------------- *
+ * Linux stat functions *
+ * ---------------------------- */
+
+#if defined(__linux__)
+
+static cpu_t *read_procstat(FILE *fp, cpu_t *cpu) {
+ char buffer[BUFFERSIZE];
+
+ fgets(buffer, BUFFERSIZE, fp);
+ sscanf(buffer, "cpu%u %Lu %Lu %Lu %Lu %Lu %Lu %Lu %Lu",
+ &(cpu->id),
+ &(cpu->user),
+ &(cpu->nice_user),
+ &(cpu->kernel),
+ &(cpu->idle),
+ &(cpu->io_wait),
+ &(cpu->hard_irq),
+ &(cpu->soft_irq),
+ &(cpu->steal));
+
+ return cpu;
+}
+
+static void util_measure(unsigned int **result_vec, int *result_sz) {
+ int no_of_cpus = processors_online();
+ int i;
+ char buffer[BUFFERSIZE];
+ FILE *fp;
+ unsigned int *rv = NULL;
+ cpu_t cpu;
+
+ if ( (fp = fopen(PROCSTAT,"r")) == NULL) {
+ /* Check if procfs is mounted,
+ * otherwise:
+ * try and try again, bad procsfs.
+ */
+ *result_sz = 0;
+ return;
+ }
+
+ fgets(buffer, BUFFERSIZE, fp); /*ignore read*/
+ rv = *result_vec;
+ rv[0] = no_of_cpus;
+ rv[1] = CU_VALUES;
+ ++rv; /* first value is number of cpus */
+ ++rv; /* second value is number of entries */
+
+ for (i = 0; i < no_of_cpus; ++i) {
+ read_procstat(fp, &cpu);
+
+ rv[ 0] = CU_CPU_ID; rv[ 1] = cpu.id;
+ rv[ 2] = CU_USER; rv[ 3] = cpu.user;
+ rv[ 4] = CU_NICE_USER; rv[ 5] = cpu.nice_user;
+ rv[ 6] = CU_KERNEL; rv[ 7] = cpu.kernel;
+ rv[ 8] = CU_IO_WAIT; rv[ 9] = cpu.io_wait;
+ rv[10] = CU_IDLE; rv[11] = cpu.idle;
+ rv[12] = CU_HARD_IRQ; rv[13] = cpu.hard_irq;
+ rv[14] = CU_SOFT_IRQ; rv[15] = cpu.soft_irq;
+ rv[16] = CU_STEAL; rv[17] = cpu.steal;
+ rv += CU_VALUES*2;
+ }
+
+ fclose(fp);
+ *result_sz = 2 + 2*CU_VALUES * no_of_cpus;
+}
+
+#endif
+
+/* ---------------------------- *
+ * Unix kstat functions *
+ * ---------------------------- */
+
+#if defined(__sun__)
+static unsigned int misc_measure(char* name) {
+ static kstat_t *ksp = NULL;
+ kstat_named_t* entry;
+ kid_t kcid;
+
+ kcid = kstat_chain_update(kstat_ctl);
+
+ if(kcid == -1)
+ error("Error updating kstat chain");
+
+ if (!ksp || kcid != 0) {
+
+ /* The kstat chain changed (or we are initializing);
+ find system misc entry in the new chain... */
+
+ ksp = kstat_lookup(kstat_ctl,"unix",0,"system_misc");
+ if(!ksp)
+ error("Can't open system_misc kstat");
+ }
+
+ kstat_read(kstat_ctl,ksp,NULL);
+ entry = kstat_data_lookup(ksp,name);
+ if(!entry)
+ return -1;
+
+ if(entry->data_type != KSTAT_DATA_ULONG)
+ return -1;
+
+ return entry->value.ul;
+}
+
+
+static int cpu_cmp(const void *p1, const void *p2) {
+ kstat_t *ksp1 = *((kstat_t **) p1);
+ kstat_t *ksp2 = *((kstat_t **) p2);
+
+ if (ksp1->ks_instance > ksp2->ks_instance)
+ return 1;
+ if (ksp1->ks_instance < ksp2->ks_instance)
+ return -1;
+ return 0;
+}
+
+
+static void util_measure(unsigned int **result_vec, int *result_sz) {
+ static int no_of_cpus = 0;
+ static kstat_t **cpu_ksps = NULL;
+ static unsigned int * resv = NULL;
+ unsigned int *rv = NULL;
+ kstat_t *ksp;
+ kid_t kcid;
+ int cpu_stats_read;
+ int i;
+
+ kcid = kstat_chain_update(kstat_ctl);
+
+ if(kcid == -1)
+ error("Error updating kstat chain");
+
+ if (no_of_cpus == 0 || kcid != 0) {
+
+ /* The kstat chain changed (or we are initializing);
+ find cpu_stat entries in the new chain... */
+
+ no_of_cpus = 0;
+
+ for(ksp = kstat_ctl->kc_chain; ksp; ksp = ksp->ks_next) {
+ if (strcmp(ksp->ks_module, "cpu_stat") == 0
+ && ksp->ks_type == KSTAT_TYPE_RAW) {
+ no_of_cpus++;
+ /* Assumes that modifications of the cpu_stat_t struct
+ in future releases of Solaris only are additions
+ of fields at the end of the struct. */
+ if(ksp->ks_data_size < sizeof(cpu_stat_t))
+ error("Error: unexpected kstat data size");
+ }
+ }
+
+ free((void *) cpu_ksps);
+ if (no_of_cpus > 0) {
+ cpu_ksps = (kstat_t **) malloc(no_of_cpus*sizeof(kstat_t *));
+ if(!cpu_ksps)
+ error("Error allocating memory");
+
+ i = 0;
+ for(ksp = kstat_ctl->kc_chain;
+ ksp && i < no_of_cpus;
+ ksp = ksp->ks_next) {
+ if (strcmp(ksp->ks_module, "cpu_stat") == 0
+ && ksp->ks_type == KSTAT_TYPE_RAW) {
+ cpu_ksps[i++] = ksp;
+ }
+ }
+
+ if (i != no_of_cpus)
+ error("Error: private kstat chain copy unexpectedly changed");
+
+ /* Erlang assumes that cpu information are sent in ascending order;
+ sort them ... */
+ qsort((void *)cpu_ksps,(size_t)no_of_cpus,sizeof(kstat_t *),cpu_cmp);
+
+ }
+
+ free((void *) resv);
+/* kstat defined values are:
+ * CU_CPU_ID
+ * CU_USER
+ * CU_KERNEL
+ * CU_IO_WAIT
+ * CU_IDLE
+ */
+ resv = (unsigned int *) malloc(sizeof(unsigned int)*(2 + 2*no_of_cpus*CU_KSTAT_VALUES));
+ if(!resv)
+ error("Error allocating memory");
+
+ }
+
+ /* Read cpu utilization statistics ... */
+
+ rv = resv;
+ rv++; /*first entry is np*/
+ rv++; /*second entry is ne*/
+ cpu_stats_read = 0;
+
+ for(i = 0; i < no_of_cpus; i++) {
+ if (kstat_read(kstat_ctl, cpu_ksps[i], NULL) != -1) {
+ cpu_stat_t *cpu_stat = (cpu_stat_t *)cpu_ksps[i]->ks_data;
+
+ rv[ 0] = CU_CPU_ID; rv[ 1] = cpu_ksps[i]->ks_instance;
+ rv[ 2] = CU_USER; rv[ 3] = cpu_stat->cpu_sysinfo.cpu[CPU_USER];
+ rv[ 4] = CU_KERNEL; rv[ 5] = cpu_stat->cpu_sysinfo.cpu[CPU_KERNEL];
+ rv[ 6] = CU_IO_WAIT; rv[ 7] = cpu_stat->cpu_sysinfo.cpu[CPU_WAIT];
+ rv[ 8] = CU_IDLE; rv[ 9] = cpu_stat->cpu_sysinfo.cpu[CPU_IDLE];
+
+ rv += CU_KSTAT_VALUES*2;
+ cpu_stats_read++;
+ }
+ }
+
+ resv[0] = cpu_stats_read;
+ resv[1] = CU_KSTAT_VALUES;
+
+ *result_vec = resv;
+ *result_sz = 2 + 2* CU_KSTAT_VALUES * cpu_stats_read;
+
+}
+#endif
+
+/* ---------------------------- *
+ * Generic functions *
+ * ---------------------------- */
+
+static void send(unsigned int data) { sendv(&data, 1); }
+
+static void sendv(unsigned int data[], int ints) {
+ static unsigned char *buf = NULL;
+ static int bufsz = 0;
+ int rc, di, bi, msgsz;
+
+ /* Assumes 32-bit integers... */
+
+ msgsz = 4*ints;
+
+ if(bufsz < msgsz) {
+ if (buf != NULL) free((void *) buf);
+ buf = malloc(msgsz);
+ if (!buf) error("Error allocating memory");
+ bufsz = msgsz;
+ }
+
+ for(bi = 0, di = 0; di < ints; di++) {
+ buf[bi++] = (data[di] >> 24) & 0xff;
+ buf[bi++] = (data[di] >> 16) & 0xff;
+ buf[bi++] = (data[di] >> 8) & 0xff;
+ buf[bi++] = (data[di] ) & 0xff;
+ }
+
+ bi = 0;
+ do {
+ rc = write(FD_OUT, &buf[bi], msgsz - bi);
+ if (rc < 0) {
+ if (errno == EINTR)
+ continue;
+ error("Error writing to Erlang");
+ }
+ bi += rc;
+ } while(msgsz - bi > 0);
+
+}
+
+static void error(char* err_msg) {
+ write(FD_ERR, err_msg, strlen(err_msg));
+ write(FD_ERR, "\n", 1);
+ exit(-1);
+}
+
+
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