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#define HASH_TABLE_BITS 8
#define HASH_TABLE_SIZE (1<<HASH_TABLE_BITS)
#define BUCKETS 16 /* largest histogram width */
#include "runtime.h"
#include "io.c"
#include "map.c"
#include "probes.c"
MODULE_DESCRIPTION("SystemTap probe: test4");
MODULE_AUTHOR("Martin Hunt <hunt@redhat.com>");
MAP opens, reads, writes;
asmlinkage long inst_sys_open (const char __user * filename, int flags, int mode)
{
_stp_map_key_str (opens, current->comm);
_stp_map_set_int64 (opens, _stp_map_get_int64(opens) + 1);
jprobe_return();
return 0;
}
asmlinkage ssize_t inst_sys_read (unsigned int fd, char __user * buf, size_t count)
{
_stp_map_key_str (reads, current->comm);
_stp_map_stat_add (reads, count);
jprobe_return();
return 0;
}
asmlinkage ssize_t inst_sys_write (unsigned int fd, const char __user * buf, size_t count)
{
_stp_map_key_str (writes, current->comm);
_stp_map_stat_add (writes, count);
jprobe_return();
return 0;
}
static struct jprobe dtr_probes[] = {
{
.kp.addr = (kprobe_opcode_t *)"sys_open",
.entry = (kprobe_opcode_t *) inst_sys_open
},
{
.kp.addr = (kprobe_opcode_t *)"sys_read",
.entry = (kprobe_opcode_t *) inst_sys_read
},
{
.kp.addr = (kprobe_opcode_t *)"sys_write",
.entry = (kprobe_opcode_t *) inst_sys_write
},
};
#define MAX_DTR_ROUTINE (sizeof(dtr_probes)/sizeof(struct jprobe))
static int init_dtr(void)
{
int ret;
opens = _stp_map_new (1000, INT64);
reads = _stp_map_new (1000, STAT);
writes = _stp_map_new (1000, STAT);
ret = _stp_register_jprobes (dtr_probes, MAX_DTR_ROUTINE);
dlog("instrumentation is enabled...\n");
return ret;
}
static void cleanup_dtr(void)
{
struct map_node_stat *st;
struct map_node_int64 *ptr;
_stp_unregister_jprobes (dtr_probes, MAX_DTR_ROUTINE);
for (ptr = (struct map_node_int64 *)_stp_map_start(opens); ptr;
ptr = (struct map_node_int64 *)_stp_map_iter (opens,(struct map_node *)ptr))
dlog ("opens[%s] = %lld\n", key1str(ptr), ptr->val);
dlog ("\n");
for (st = (struct map_node_stat *)_stp_map_start(reads); st;
st = (struct map_node_stat *)_stp_map_iter (reads,(struct map_node *)st))
dlog ("reads[%s] = [count=%lld sum=%lld min=%lld max=%lld]\n", key1str(st), st->stats.count, st->stats.sum,
st->stats.min, st->stats.max);
dlog ("\n");
for (st = (struct map_node_stat *)_stp_map_start(writes); st;
st = (struct map_node_stat *)_stp_map_iter (writes,(struct map_node *)st))
dlog ("writes[%s] = [count=%lld sum=%lld min=%lld max=%lld]\n", key1str(st), st->stats.count, st->stats.sum,
st->stats.min, st->stats.max);
dlog ("\n");
_stp_map_del (opens);
_stp_map_del (reads);
_stp_map_del (writes);
dlog("EXIT\n");
}
module_init(init_dtr);
module_exit(cleanup_dtr);
MODULE_LICENSE("GPL");
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