On 04/06/2012 08:29 AM, Alexey Ivanov wrote: > In progress of migration from FreeBSD to Linux and we found some strange behavior: periodically running tasks (like rsync/p2p deployment) evict mapped pages from memory. > > From my little research I've found following lkml thread: > https://lkml.org/lkml/2008/6/11/278 > And more precisely this commit: https://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4f98a2fee8acdb4ac84545df98cccecfd130f8db > which along with splitting LRU into "anon" and "file" removed support of reclaim_mapped. > > Is there a knob to prioritize mapped memory over unmapped (without modifying all apps to use O_DIRECT/fadvise/madvise or mlocking our data in memory) or at least some way to change proportion of Active(file)/Inactive(file)? > Hi Alexey, Cc to linux-mm mailing list. I have met the similar problem and I have sent a mail to discuss it. Maybe it can help you (http://marc.info/?l=linux-mm&m=132947026019538&w=2). Now Konstantin has sent a patch set to try to expand vm_flags from 32 bit to 64 bit. Then we can add the new flag into vm_flags and prioritize mmaped pages in madvise(2). Regards, Zheng -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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>