mglru: mm/vmscan.c: fix imprecise comments

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Yu Zhao <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

mm/vmscan.c

···
 	DEFINE_MAX_SEQ(lruvec);
 
 	if (!current_is_kswapd()) {
-		/* age each memcg once to ensure fairness */
+		/* age each memcg at most once to ensure fairness */
 		if (max_seq - seq > 1)
 			return true;
 
···
 
 	/*
 	 * A minimum amount of work was done under global memory pressure. For
-	 * kswapd, it may be overshooting. For direct reclaim, the target isn't
-	 * met, and yet the allocation may still succeed, since kswapd may have
-	 * caught up. In either case, it's better to stop now, and restart if
-	 * necessary.
+	 * kswapd, it may be overshooting. For direct reclaim, the allocation
+	 * may succeed if all suitable zones are somewhat safe. In either case,
+	 * it's better to stop now, and restart later if necessary.
 	 */
 	for (i = 0; i <= sc->reclaim_idx; i++) {
 		unsigned long wmark;