Hi, currently when one process causes heavy swapping, the responsiveness of the hole system suffers greatly. With the small memleak [1] test tool I wrote, the effect can be experienced very easily, depending on the delay the lag can become quite large. If I ensure that 10% of the RAM stay free for free memory and cache, the system never swaps to death. That works very well, but if accesses to the swap are very heavy, the system still lags on all other processes, not only the swapping one. Putting the swapping process into a blkio cgroup with little weight does not affect the io or swap io from other processes with larger weight in their group. Maybe I'm mistaken, but wouldn't it be the easiest way to get fair swapping and control to let the pagein respect the blkio.weight value or even better add a second weight value for swapping io ? kind regards Daniel [1] https://github.com/poelzi/ulatencyd/blob/master/tests/memleak.c -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>