2.6.28-rc8 big regression in VM

[Lukas Hejtmanek]

Hello,

I noticed that in the current git head, the VM subsystem contains a serious
bug - cached memory is newer freed:

# free; echo 3 > /proc/sys/vm/drop_caches; free
             total       used       free     shared    buffers     cached
Mem:       2016688     669172    1347516          0       2160     335120
-/+ buffers/cache:     331892    1684796
Swap:      1542232          0    1542232
             total       used       free     shared    buffers     cached
Mem:       2016688     659336    1357352          0        320     327288
-/+ buffers/cache:     331728    1684960
Swap:      1542232          0    1542232

the above sequence has been done on completly idle system so there is no
reason for non freeing the cache.

once the whole memory is eaten by the cache, the system is pretty unusable.

-- 
Lukáš Hejtmánek
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