Ejemplo n.º 1
0
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;
}
Ejemplo n.º 2
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();
}
Ejemplo n.º 3
0
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;
}
Ejemplo n.º 4
0
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;
    }
}