void sampling_init()
{
int i ;
if (ksym_total() > MAX_KSYM) {
dbg_printf(DL_KDB, "ksym %d > MAX_KSYM\n", ksym_total());
return;
}
for (i = 0; i < MAX_SAMPLING_COUNT; i++) {
sampled_pc[i] = 0;
}
sampled_count = 0;
}
void kdb_show_sampling(void)
{
int i;
int symid;
int *hitcount, *symid_list;
static int init = 0;
static struct kprobe k;
if (init == 0) {
dbg_printf(DL_KDB, "Init sampling...\n");
sampling_init();
sampling_enable();
init++;
k.addr = ktimer_handler;
k.pre_handler = sampling_handler;
k.post_handler = NULL;
kprobe_register(&k);
return;
}
sampling_disable();
sampling_stats(&hitcount, &symid_list);
for (i = 0; i < ksym_total(); i++) {
symid = symid_list[i];
if (hitcount[symid] == 0)
break;
dbg_printf(DL_KDB, "%5d [ %24s ]\n", hitcount[symid],
ksym_id2name(symid));
}
sampling_enable();
}
void sampling_stats(int **hitcountp, int **symid_list)
{
int i, symid;
/* init data */
sort(sampled_pc, MAX_SAMPLING_COUNT, sizeof(sampled_pc[0]), cmp_addr);
for (i = 0; i < MAX_KSYM; i++) {
ksym_hitcount[i] = 0;
ksymid_sortedlist[i] = i;
}
/* calculation total hit for each ksym */
for (i = 0; i < MAX_SAMPLING_COUNT; i++) {
symid = ksym_lookup(sampled_pc[i]);
if (symid < 0)
continue;
ksym_hitcount[symid]++;
}
/* create a list from highest hit to lowest hit */
sort(ksymid_sortedlist, ksym_total(),
sizeof(ksymid_sortedlist[0]), cmp_symhit);
/* output the result */
*hitcountp = ksym_hitcount;
*symid_list = ksymid_sortedlist;
}
static int cmp_key(const void *addr, const void *p1)
{
ksym_t * sym = (ksym_t *)p1;
if (sym == (__ksym_tbl+ksym_total()-1)) {
return 0;
}
else if ((addr >= sym->addr) && (addr < (sym+1)->addr)) {
return 0;
}
else {
return addr - ((ksym_t *) sym)->addr;
}
}