Improve error handling in libovni
- Transform asserts into unconditional checks - Abort as soon as an error is encountered - Remove return errors
This commit is contained in:
parent
2ffd8407e0
commit
2046833700
1
common.h
1
common.h
@ -10,6 +10,7 @@
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#endif
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#define err(...) fprintf(stderr, __VA_ARGS__);
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#define die(...) do { err("fatal: " __VA_ARGS__); abort(); } while (0)
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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363
ovni.c
363
ovni.c
@ -23,23 +23,16 @@
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*/
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#define _GNU_SOURCE
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#include <unistd.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <time.h>
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#include <string.h>
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#include <linux/limits.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <stdatomic.h>
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#include <assert.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <unistd.h>
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#include "ovni.h"
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#include "common.h"
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@ -50,9 +43,8 @@
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# define gettid() ((pid_t)syscall(SYS_gettid))
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#endif
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//#define ENABLE_SLOW_CHECKS
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//#define USE_RDTSC
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/* Prevent usage of assert() */
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#pragma GCC poison assert
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/* Data per process */
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struct ovni_rproc rproc = {0};
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@ -60,8 +52,8 @@ struct ovni_rproc rproc = {0};
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/* Data per thread */
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_Thread_local struct ovni_rthread rthread = {0};
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static int
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create_trace_dirs(char *tracedir, const char *loom, int proc)
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static void
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create_trace_dirs(char *tracedir, const char *loom, int pid)
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{
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char path[PATH_MAX];
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@ -75,222 +67,202 @@ create_trace_dirs(char *tracedir, const char *loom, int proc)
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/* Also may fail */
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mkdir(path, 0755);
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snprintf(rproc.dir, PATH_MAX, "%s/loom.%s/proc.%d", tracedir, loom, proc);
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snprintf(rproc.dir, PATH_MAX, "%s/loom.%s/proc.%d", tracedir, loom, pid);
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/* But this one shall not fail */
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if(mkdir(rproc.dir, 0755))
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{
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fprintf(stderr, "mkdir %s: %s\n", rproc.dir, strerror(errno));
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return -1;
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}
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return 0;
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die("mkdir %s failed: %s\n", rproc.dir, strerror(errno));
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}
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static int
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static void
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create_trace_stream(void)
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{
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char path[PATH_MAX];
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if(snprintf(path, PATH_MAX, "%s/thread.%d", rproc.dir, rthread.tid)
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>= PATH_MAX)
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{
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abort();
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}
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int written = snprintf(path, PATH_MAX, "%s/thread.%d",
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rproc.dir, rthread.tid);
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if(written >= PATH_MAX)
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die("thread trace path too long: %s/thread.%d\n",
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rproc.dir, rthread.tid);
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//rthread.streamfd = open(path, O_WRONLY | O_CREAT | O_DSYNC, 0644);
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rthread.streamfd = open(path, O_WRONLY | O_CREAT, 0644);
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if(rthread.streamfd == -1)
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{
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fprintf(stderr, "open %s failed: %s\n", path, strerror(errno));
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return -1;
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}
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return 0;
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die("open %s failed: %s\n", path, strerror(errno));
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}
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static int
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static void
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proc_metadata_init(struct ovni_rproc *proc)
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{
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proc->meta = json_value_init_object();
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if(proc->meta == NULL)
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{
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err("failed to create json object\n");
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abort();
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}
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return 0;
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die("failed to create metadata JSON object\n");
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}
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static int
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static void
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proc_metadata_store(struct ovni_rproc *proc)
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{
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char path[PATH_MAX];
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if(proc->meta == NULL)
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die("process metadata not initialized\n");
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if(snprintf(path, PATH_MAX, "%s/metadata.json", proc->dir) >= PATH_MAX)
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abort();
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assert(proc->meta != NULL);
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die("metadata path too long: %s/metadata.json\n", proc->dir);
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if(json_serialize_to_file_pretty(proc->meta, path) != JSONSuccess)
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{
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err("failed to write proc metadata\n");
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abort();
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}
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return 0;
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die("failed to write process metadata\n");
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}
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void
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ovni_add_cpu(int index, int phyid)
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{
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JSON_Array *cpuarray;
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JSON_Object *cpu;
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JSON_Object *meta;
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JSON_Value *valcpu, *valcpuarray;
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int append = 0;
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if(index < 0)
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die("ovni_add_cpu: cannot use negative index %d\n", index);
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assert(rproc.ready == 1);
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assert(rproc.meta != NULL);
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if(phyid < 0)
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die("ovni_add_cpu: cannot use negative CPU id %d\n", phyid);
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meta = json_value_get_object(rproc.meta);
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if(!rproc.ready)
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die("ovni_add_cpu: process not yet initialized\n");
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assert(meta);
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if(rproc.meta == NULL)
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die("ovni_add_cpu: metadata not initialized\n");
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JSON_Object *meta = json_value_get_object(rproc.meta);
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if(meta == NULL)
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die("ovni_add_cpu: json_value_get_object() failed\n");
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int first_time = 0;
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/* Find the CPU array and create it if needed */
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cpuarray = json_object_dotget_array(meta, "cpus");
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JSON_Array *cpuarray = json_object_dotget_array(meta, "cpus");
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if(cpuarray == NULL)
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{
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valcpuarray = json_value_init_array();
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assert(valcpuarray);
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JSON_Value *value = json_value_init_array();
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if(value == NULL)
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die("ovni_add_cpu: json_value_init_array() failed\n");
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cpuarray = json_array(valcpuarray);
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assert(cpuarray);
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append = 1;
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cpuarray = json_array(value);
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if(cpuarray == NULL)
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die("ovni_add_cpu: json_array() failed\n");
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first_time = 1;
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}
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valcpuarray = json_array_get_wrapping_value(cpuarray);
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assert(valcpuarray);
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JSON_Value *valcpu = json_value_init_object();
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if(valcpu == NULL)
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die("ovni_add_cpu: json_value_init_object() failed\n");
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valcpu = json_value_init_object();
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assert(valcpu);
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cpu = json_object(valcpu);
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assert(cpu);
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JSON_Object *cpu = json_object(valcpu);
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if(cpu == NULL)
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die("ovni_add_cpu: json_object() failed\n");
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if(json_object_set_number(cpu, "index", index) != 0)
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abort();
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die("ovni_add_cpu: json_object_set_number() failed\n");
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if(json_object_set_number(cpu, "phyid", phyid) != 0)
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abort();
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die("ovni_add_cpu: json_object_set_number() failed\n");
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if(json_array_append_value(cpuarray, valcpu) != 0)
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abort();
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die("ovni_add_cpu: json_array_append_value() failed\n");
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if(append && json_object_set_value(meta, "cpus", valcpuarray) != 0)
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abort();
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if(first_time)
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{
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JSON_Value *value = json_array_get_wrapping_value(cpuarray);
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if(value == NULL)
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die("ovni_add_cpu: json_array_get_wrapping_value() failed\n");
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//puts(json_serialize_to_string_pretty(rproc.meta));
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if(json_object_set_value(meta, "cpus", value) != 0)
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die("ovni_add_cpu: json_object_set_value failed\n");
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}
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}
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static void
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proc_set_app(int appid)
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{
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JSON_Object *meta;
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JSON_Object *meta = json_value_get_object(rproc.meta);
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assert(rproc.ready == 1);
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assert(rproc.meta != NULL);
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meta = json_value_get_object(rproc.meta);
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assert(meta);
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if(meta == NULL)
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die("json_value_get_object failed\n");
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if(json_object_set_number(meta, "app_id", appid) != 0)
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abort();
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die("json_object_set_number for app_id failed\n");
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}
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int
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ovni_proc_init(int app, const char *loom, int proc)
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void
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ovni_proc_init(int app, const char *loom, int pid)
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{
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assert(rproc.ready == 0);
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if(rproc.ready)
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die("ovni_proc_init: pid %d already initialized\n", pid);
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memset(&rproc, 0, sizeof(rproc));
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/* FIXME: strcpy is insecure */
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strcpy(rproc.loom, loom);
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rproc.proc = proc;
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rproc.app = app;
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if(strlen(loom) >= OVNI_MAX_HOSTNAME)
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die("ovni_proc_init: loom name too long: %s\n", loom);
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/* By default we use the monotonic clock */
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strcpy(rproc.loom, loom);
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rproc.pid = pid;
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rproc.app = app;
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rproc.clockid = CLOCK_MONOTONIC;
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if(create_trace_dirs(OVNI_TRACEDIR, loom, proc))
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abort();
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create_trace_dirs(OVNI_TRACEDIR, loom, pid);
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if(proc_metadata_init(&rproc) != 0)
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abort();
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proc_metadata_init(&rproc);
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rproc.ready = 1;
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proc_set_app(app);
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return 0;
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}
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int
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void
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ovni_proc_fini(void)
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{
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if(proc_metadata_store(&rproc) != 0)
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abort();
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if(!rproc.ready)
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die("ovni_proc_fini: process not initialized\n");
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return 0;
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proc_metadata_store(&rproc);
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}
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int
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void
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ovni_thread_init(pid_t tid)
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{
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assert(tid != 0);
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if(rthread.ready)
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{
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fprintf(stderr, "warning: thread tid=%d already initialized\n",
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tid);
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return 0;
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err("warning: thread %d already initialized, ignored\n", tid);
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return;
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}
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assert(rthread.ready == 0);
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assert(rthread.tid == 0);
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assert(rthread.cpu == 0);
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assert(rproc.ready == 1);
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if(tid == 0)
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die("ovni_thread_init: cannot use tid=%d\n", tid);
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if(!rproc.ready)
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die("ovni_thread_init: process not yet initialized\n");
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memset(&rthread, 0, sizeof(rthread));
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rthread.tid = tid;
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rthread.cpu = -666;
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rthread.evlen = 0;
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rthread.evbuf = malloc(OVNI_MAX_EV_BUF);
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if(rthread.evbuf == NULL)
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{
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perror("malloc");
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abort();
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}
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if(create_trace_stream())
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abort();
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if(rthread.evbuf == NULL)
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die("ovni_thread_init: malloc failed: %s", strerror(errno));
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create_trace_stream();
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rthread.ready = 1;
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return 0;
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}
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void
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ovni_thread_free(void)
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{
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assert(rthread.ready);
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if(!rthread.ready)
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die("ovni_thread_free: thread not initialized\n");
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free(rthread.evbuf);
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}
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@ -300,95 +272,61 @@ ovni_thread_isready(void)
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return rthread.ready;
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}
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#ifdef USE_RDTSC
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#ifdef USE_TSC
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static inline
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uint64_t rdtsc(void)
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uint64_t clock_tsc_now(void)
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{
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uint32_t lo, hi;
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// RDTSC copies contents of 64-bit TSC into EDX:EAX
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/* RDTSC copies contents of 64-bit TSC into EDX:EAX */
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__asm__ volatile("rdtsc" : "=a" (lo), "=d" (hi));
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return (uint64_t) hi << 32 | lo;
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}
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#endif
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static uint64_t
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clock_monotonic_now(void)
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{
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uint64_t ns = 1000ULL * 1000ULL * 1000ULL;
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struct timespec tp;
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if(clock_gettime(rproc.clockid, &tp))
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die("clock_gettime() failed: %s\n", strerror(errno));
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return tp.tv_sec * ns + tp.tv_nsec;
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}
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uint64_t
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ovni_clock_now(void)
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{
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struct timespec tp;
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uint64_t ns = 1000LL * 1000LL * 1000LL;
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uint64_t raw;
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#ifdef USE_RDTSC
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raw = rdtsc();
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#ifdef USE_TSC
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return clock_tsc_now();
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#else
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#ifdef ENABLE_SLOW_CHECKS
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int ret = clock_gettime(rproc.clockid, &tp);
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if(ret) abort();
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#else
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clock_gettime(rproc.clockid, &tp);
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#endif /* ENABLE_SLOW_CHECKS */
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raw = tp.tv_sec * ns + tp.tv_nsec;
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#endif /* USE_RDTSC */
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return raw;
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return clock_monotonic_now();
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#endif
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}
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//static void
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//hexdump(uint8_t *buf, size_t size)
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//{
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// size_t i, j;
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//
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// //printf("writing %ld bytes in cpu=%d\n", size, rthread.cpu);
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//
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// for(i=0; i<size; i+=16)
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// {
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// for(j=0; j<16 && i+j < size; j++)
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// {
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// err("%02x ", buf[i+j]);
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// }
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// err("\n");
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// }
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//}
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static int
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ovni_write(uint8_t *buf, size_t size)
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static void
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write_evbuf(uint8_t *buf, size_t size)
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{
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ssize_t written;
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do
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{
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written = write(rthread.streamfd, buf, size);
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ssize_t written = write(rthread.streamfd, buf, size);
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if(written < 0)
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{
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perror("write");
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return -1;
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}
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die("failed to write buffer to disk: %s\n", strerror(errno));
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size -= written;
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buf += written;
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} while(size > 0);
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return 0;
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}
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static int
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static void
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flush_evbuf(void)
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{
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int ret;
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assert(rthread.ready);
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assert(rproc.ready);
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ret = ovni_write(rthread.evbuf, rthread.evlen);
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write_evbuf(rthread.evbuf, rthread.evlen);
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rthread.evlen = 0;
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return ret;
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}
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void
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@ -440,15 +378,17 @@ ovni_payload_size(const struct ovni_ev *ev)
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void
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ovni_payload_add(struct ovni_ev *ev, const uint8_t *buf, int size)
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{
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size_t payload_size;
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if(ev->header.flags & OVNI_EV_JUMBO)
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die("ovni_payload_add: event is marked as jumbo\n");
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assert((ev->header.flags & OVNI_EV_JUMBO) == 0);
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assert(size >= 2);
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if(size < 2)
|
||||
die("ovni_payload_add: payload size %d too small\n", size);
|
||||
|
||||
payload_size = ovni_payload_size(ev);
|
||||
size_t payload_size = ovni_payload_size(ev);
|
||||
|
||||
/* Ensure we have room */
|
||||
assert(payload_size + size <= sizeof(ev->payload));
|
||||
if(payload_size + size > sizeof(ev->payload))
|
||||
die("ovni_payload_add: no space left for %d bytes\n", size);
|
||||
|
||||
memcpy(&ev->payload.u8[payload_size], buf, size);
|
||||
payload_size += size;
|
||||
@ -465,19 +405,21 @@ ovni_ev_size(const struct ovni_ev *ev)
|
||||
static void
|
||||
ovni_ev_add(struct ovni_ev *ev);
|
||||
|
||||
int
|
||||
void
|
||||
ovni_flush(void)
|
||||
{
|
||||
int ret = 0;
|
||||
struct ovni_ev pre={0}, post={0};
|
||||
|
||||
assert(rthread.ready);
|
||||
assert(rproc.ready);
|
||||
if(!rthread.ready)
|
||||
die("ovni_flush: thread is not initialized\n");
|
||||
|
||||
if(!rproc.ready)
|
||||
die("ovni_flush: process is not initialized\n");
|
||||
|
||||
ovni_ev_set_clock(&pre, ovni_clock_now());
|
||||
ovni_ev_set_mcv(&pre, "OF[");
|
||||
|
||||
ret = flush_evbuf();
|
||||
flush_evbuf();
|
||||
|
||||
ovni_ev_set_clock(&post, ovni_clock_now());
|
||||
ovni_ev_set_mcv(&post, "OF]");
|
||||
@ -485,8 +427,6 @@ ovni_flush(void)
|
||||
/* Add the two flush events */
|
||||
ovni_ev_add(&pre);
|
||||
ovni_ev_add(&post);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void
|
||||
@ -508,16 +448,19 @@ add_flush_events(uint64_t t0, uint64_t t1)
|
||||
static void
|
||||
ovni_ev_add_jumbo(struct ovni_ev *ev, const uint8_t *buf, uint32_t bufsize)
|
||||
{
|
||||
size_t evsize, totalsize;
|
||||
int flushed = 0;
|
||||
uint64_t t0, t1;
|
||||
|
||||
assert(ovni_payload_size(ev) == 0);
|
||||
if(ovni_payload_size(ev) != 0)
|
||||
die("ovni_ev_add_jumbo: the event payload must be empty\n");
|
||||
|
||||
ovni_payload_add(ev, (uint8_t *) &bufsize, sizeof(bufsize));
|
||||
evsize = ovni_ev_size(ev);
|
||||
size_t evsize = ovni_ev_size(ev);
|
||||
|
||||
totalsize = evsize + bufsize;
|
||||
size_t totalsize = evsize + bufsize;
|
||||
|
||||
if(totalsize >= OVNI_MAX_EV_BUF)
|
||||
die("ovni_ev_add_jumbo: event too large\n");
|
||||
|
||||
/* Check if the event fits or flush first otherwise */
|
||||
if(rthread.evlen + totalsize >= OVNI_MAX_EV_BUF)
|
||||
@ -538,8 +481,6 @@ ovni_ev_add_jumbo(struct ovni_ev *ev, const uint8_t *buf, uint32_t bufsize)
|
||||
memcpy(&rthread.evbuf[rthread.evlen], buf, bufsize);
|
||||
rthread.evlen += bufsize;
|
||||
|
||||
assert(rthread.evlen < OVNI_MAX_EV_BUF);
|
||||
|
||||
if(flushed)
|
||||
{
|
||||
/* Emit the flush events *after* the user event */
|
||||
@ -550,10 +491,10 @@ ovni_ev_add_jumbo(struct ovni_ev *ev, const uint8_t *buf, uint32_t bufsize)
|
||||
static void
|
||||
ovni_ev_add(struct ovni_ev *ev)
|
||||
{
|
||||
int size, flushed = 0;
|
||||
int flushed = 0;
|
||||
uint64_t t0, t1;
|
||||
|
||||
size = ovni_ev_size(ev);
|
||||
int size = ovni_ev_size(ev);
|
||||
|
||||
/* Check if the event fits or flush first otherwise */
|
||||
if(rthread.evlen + size >= OVNI_MAX_EV_BUF)
|
||||
|
||||
14
ovni.h
14
ovni.h
@ -94,10 +94,6 @@ struct __attribute__((__packed__)) ovni_ev {
|
||||
|
||||
/* State of each thread on runtime */
|
||||
struct ovni_rthread {
|
||||
/* Current cpu the thread is running on. Set to -1 if unbounded or
|
||||
* unknown */
|
||||
int cpu;
|
||||
|
||||
/* Current thread id */
|
||||
pid_t tid;
|
||||
|
||||
@ -119,7 +115,7 @@ struct ovni_rproc {
|
||||
char dir[PATH_MAX];
|
||||
|
||||
int app;
|
||||
int proc;
|
||||
int pid;
|
||||
char loom[OVNI_MAX_HOSTNAME];
|
||||
int ncpus;
|
||||
clockid_t clockid;
|
||||
@ -130,11 +126,11 @@ struct ovni_rproc {
|
||||
JSON_Value *meta;
|
||||
};
|
||||
|
||||
int ovni_proc_init(int app, const char *loom, int proc);
|
||||
void ovni_proc_init(int app, const char *loom, int pid);
|
||||
|
||||
int ovni_proc_fini(void);
|
||||
void ovni_proc_fini(void);
|
||||
|
||||
int ovni_thread_init(pid_t tid);
|
||||
void ovni_thread_init(pid_t tid);
|
||||
|
||||
void ovni_thread_free(void);
|
||||
|
||||
@ -164,7 +160,7 @@ void ovni_add_cpu(int index, int phyid);
|
||||
void ovni_ev_emit(struct ovni_ev *ev);
|
||||
void ovni_ev_jumbo_emit(struct ovni_ev *ev, const uint8_t *buf, uint32_t bufsize);
|
||||
|
||||
int ovni_flush(void);
|
||||
void ovni_flush(void);
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user