metaslab_free_dva.xd

#!/usr/sbin/dtrace -s

#pragma D option quiet
#pragma D option aggsortpos=2
#pragma D option aggrate=10hz
#pragma D option switchrate=10hz
#pragma D option dynvarsize=10m

fbt::spa_sync:entry
/stringof(args[0]->spa_name) == $$1/
{
        self->yes = 1;
}

spa_sync_frees:entry
/self->yes/
{
	sync_frees=1;
}

spa_sync_frees:return
/self->yes/
{
	sync_frees=0;

        this->delta = timestamp - entry->timestamp;
        @c[probefunc] = count();
        @t[probefunc] = sum(this->delta);
        @p[probefunc] = sum(this->delta);
}

#if 0
zio_free_sync:entry
/sync_frees/
{
	if ((args[3]->blk_dva[0].dva_word[1] >> 63) & 1) {
		@c["free(gang)"] = count();
	} else {
		@c["free(non-gang)"] = count();
	}
}
#endif

metaslab_free_dva:return
/sync_frees/
{
        this->delta = timestamp - entry->timestamp;

        @c[probefunc] = count();
        @t[probefunc] = sum(this->delta);
        @p[probefunc] = sum(this->delta);

	@q[probefunc] = quantize(this->delta/1000);
	@callers[stack()] = count();
}

space_map_add:entry
/sync_frees && callers["metaslab_free_dva"]/
{
	@entries = quantize(args[0]->sm_root.avl_numnodes);
}

space_map_*:return,
zio_dva_free:return
/sync_frees && callers["metaslab_free_dva"]/
{
        this->delta = timestamp - entry->timestamp;

        @c[probefunc] = count();
        @t[probefunc] = sum(this->delta);
        @p[probefunc] = sum(this->delta);
}

fbt::spa_sync:return
/self->yes/
{
        this->delta = timestamp - entry->timestamp;

        @c[probefunc] = count();
        @t[probefunc] = sum(this->delta);
        @p[probefunc] = sum(this->delta);

        normalize(@t, 1000000);
        normalize(@p, this->delta / 100);

	printf("txg %u:\n", entry->args[1]);
        printa("%-30s  %@5d times  %@10dms (%@2d%%)\n", @c, @t, @p);
        printf("\n");
        clear(@c);
        clear(@t);
        clear(@p);

	printa(@q);
	clear(@q);

	printf("entries in avl tree when space_map_add called from metaslab_free_dva:\n");
	printa(@entries);
	clear(@entries);

	printf("callers of metaslab_free_dva:");
	printa(@callers);
	trunc(@callers);
}