On Mon, Nov 8, 2010 at 2:38 PM, Johannes Weiner <hannes@xxxxxxxxxxx> wrote: > 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. Duh :) thanks. -- 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