SystemTap: probes/test4/dtr.c Source File

00001 #define HASH_TABLE_BITS 8
+00002 #define HASH_TABLE_SIZE (1<<HASH_TABLE_BITS)
+00003 #define BUCKETS 16 /* largest histogram width */
+00004 
+00005 #include "runtime.h"
+00006 #include "io.c"
+00007 #include "map.c"
+00008 #include "probes.c"
+00009 
+00010 MODULE_DESCRIPTION("SystemTap probe: test4");
+00011 MODULE_AUTHOR("Martin Hunt <hunt@redhat.com>");
+00012 
+00013 MAP opens, reads, writes;
+00014 
+00015 asmlinkage long inst_sys_open (const char __user * filename, int flags, int mode)
+00016 {
+00017   _stp_map_key_str (opens, current->comm);
+00018   _stp_map_add_int64 (opens, 1);
+00019   jprobe_return();
+00020   return 0;
+00021 }
+00022 
+00023 asmlinkage ssize_t inst_sys_read (unsigned int fd, char __user * buf, size_t count)
+00024 {
+00025   _stp_map_key_str (reads, current->comm);
+00026   _stp_map_stat_add (reads, count);
+00027   jprobe_return();
+00028   return 0;
+00029 }
+00030 
+00031 asmlinkage ssize_t inst_sys_write (unsigned int fd, const char __user * buf, size_t count)
+00032 {
+00033   _stp_map_key_str (writes, current->comm);
+00034   _stp_map_stat_add (writes, count);
+00035   jprobe_return();
+00036   return 0;
+00037 }
+00038 
+00039 static struct jprobe dtr_probes[] = {
+00040   {
+00041     .kp.addr = (kprobe_opcode_t *)"sys_open",
+00042     .entry = (kprobe_opcode_t *) inst_sys_open
+00043   },
+00044   {
+00045     .kp.addr = (kprobe_opcode_t *)"sys_read",
+00046     .entry = (kprobe_opcode_t *) inst_sys_read
+00047   },
+00048   {
+00049     .kp.addr = (kprobe_opcode_t *)"sys_write",
+00050     .entry = (kprobe_opcode_t *) inst_sys_write
+00051   },
+00052 };
+00053 
+00054 #define MAX_DTR_ROUTINE (sizeof(dtr_probes)/sizeof(struct jprobe))
+00055 
+00056 static int init_dtr(void)
+00057 {
+00058   int ret;
+00059   
+00060   opens = _stp_map_new (1000, INT64);
+00061   reads = _stp_map_new (1000, STAT);
+00062   writes = _stp_map_new (1000, STAT);
+00063 
+00064   ret = _stp_register_jprobes (dtr_probes, MAX_DTR_ROUTINE);
+00065 
+00066   dlog("instrumentation is enabled...\n");
+00067   return ret;
+00068 
+00069 }
+00070 
+00071 static void cleanup_dtr(void)
+00072 {
+00073   struct map_node_stat *st;
+00074   struct map_node_int64 *ptr;
+00075 
+00076   _stp_unregister_jprobes (dtr_probes, MAX_DTR_ROUTINE);
+00077 
+00078   for (ptr = (struct map_node_int64 *)_stp_map_start(opens); ptr; 
+00079        ptr = (struct map_node_int64 *)_stp_map_iter (opens,(struct map_node *)ptr))
+00080     dlog ("opens[%s] = %lld\n", key1str(ptr), ptr->val); 
+00081   dlog ("\n");
+00082 
+00083   for (st = (struct map_node_stat *)_stp_map_start(reads); st; 
+00084        st = (struct map_node_stat *)_stp_map_iter (reads,(struct map_node *)st))
+00085     dlog ("reads[%s] = [count=%lld  sum=%lld   min=%lld   max=%lld]\n", key1str(st), st->stats.count, st->stats.sum,
+00086             st->stats.min, st->stats.max);
+00087   dlog ("\n");
+00088 
+00089   for (st = (struct map_node_stat *)_stp_map_start(writes); st; 
+00090        st = (struct map_node_stat *)_stp_map_iter (writes,(struct map_node *)st))
+00091     dlog ("writes[%s] = [count=%lld  sum=%lld   min=%lld   max=%lld]\n", key1str(st), st->stats.count, st->stats.sum,
+00092             st->stats.min, st->stats.max);
+00093   dlog ("\n");
+00094 
+00095   _stp_map_del (opens);
+00096   _stp_map_del (reads);
+00097   _stp_map_del (writes);
+00098 
+00099   dlog("EXIT\n");
+00100 }
+00101 
+00102 module_init(init_dtr);
+00103 module_exit(cleanup_dtr);
+00104 MODULE_LICENSE("GPL");
+00105 
+