On Mon, Nov 08, 2010 at 02:25:15PM -0800, Greg Thelen wrote: > Minchan Kim <minchan.kim@xxxxxxxxx> writes: > > > On Mon, Nov 8, 2010 at 7:14 AM, Johannes Weiner <hannes@xxxxxxxxxxx> wrote: > >> The memory cgroup dirty info calculation currently uses a signed > >> 64-bit type to represent the amount of dirtyable memory in pages. > >> > >> This can instead be changed to an unsigned word, which will allow the > >> formula to function correctly with up to 160G of LRU pages on a 32-bit > Is is really 160G of LRU pages? On 32-bit machine we use a 32 bit > unsigned page number. With a 4KiB page size, I think that maps 16TiB > (1<<(32+12)) bytes. Or is there some other limit? Yes, the dirty limit we calculate from it :) We have to be able to multiply this number by up to 100 (maximum dirty ratio value) without overflowing. -- 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 policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>