Re: 2.6.28-rc8 big regression in VM

From: KOSAKI Motohiro
Date: Mon Dec 15 2008 - 05:57:19 EST


> On Mon, Dec 15, 2008 at 11:05:24AM +0900, KOSAKI Motohiro wrote:
> > I also don't reproduce your problem.
> > Could you get output of "cat /proc/meminfo", not only free command?
>
> attached meminfo and vmstat after dropping caches.


MemTotal: 2016688 kB
MemFree: 1528748 kB
Buffers: 424 kB
Cached: 140060 kB
SwapCached: 0 kB
Active(anon): 329884 kB
Inactive(anon): 4 kB
Active(file): 23368 kB
Inactive(file): 47328 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 1542232 kB
SwapFree: 1542232 kB
Dirty: 64 kB
Writeback: 0 kB
AnonPages: 260100 kB
Mapped: 85036 kB


Usually, Cached - tmpfs ~= Active(file) + Inactive(file).
tmpfs file isn't droppable.

We should see Active(file) + Inactive(file) (= 70696kB) instead Cached.
In addition, drop_cache sysctl can't drop Mapped memory.

Then, this value isn't so wonder value, IMHO.




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