Limiting pagecaches

Limiting pagecaches

[miyoshi]

Hi, all

Is there any way to limit the size of pagecaches?

I observed that performance of some memory hog benchmark
does not stable, depending on the pagecache size.
I think it is natural behavior of VM subsystem,
but some user care for perfomance stability :-<

I saw /proc/sys/vm/pagecaches sysctl entry in early 2.4,
but "max_percent" value was not used in the source code.
On newer kernel, entry itself seems disappeared...

Is there any trial to provide feature to limit pagecache?

Thanks,
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Re: Limiting pagecaches

[Andrew Morton]

miyoshi@hpc.bs1.fc.nec.co.jp wrote:
> 
> Hi, all
> 
> Is there any way to limit the size of pagecaches?

No.

> I observed that performance of some memory hog benchmark
> does not stable, depending on the pagecache size.
> I think it is natural behavior of VM subsystem,
> but some user care for perfomance stability :-<

If you could tell us what the problem was, and how to
reproduce it then we may be able to fix it or find a tuning
solution.

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