mapped pagecache pages vs unmapped pages

[Alexey Ivanov]

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)?

-- 
Sincerely,
Alexey Ivanov
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