dianostics: change the memory unit to keep consistant with disk (#7169)
dianostics: change the memory unit to keep consistant with disk (#7169)

Signed-off-by: crazycs520 <174f850cd6ed76c2653f481397d398dd570f1f87@gmail.com>
pingcap/tikv,BusyJay/tikv,c4pt0r/tikv,BusyJay/tikv,pingcap/tikv,BusyJay/tikv,BusyJay/tikv