Re: Limiting memory allocated by buffer cache in 2.4 kernel

[Marcelo Tosatti]

On Wed, Dec 15, 2004 at 09:56:23AM -0800, Jesse Barnes wrote:
> On Wednesday, December 15, 2004 6:45 am, N.C.Krishna Murthy (krmurthy) wrote:
> > Hi,
> >  I am using linux 2.4.22 kernel. Is there any way to limit the amount
> > of memory allocated by buffer cache? Eariler versions used to have
> > /proc/sys/vm/buffermem.

Nope, there is no such feature. 

It may have worked in v2.2 (not sure about that though, have you checked?) but 
it surely doesnt in v2.4.

> For that matter, is there a way to do this in 2.6?  We've seen problems caused 
> by huge page caches pushing data allocations off-node, so it would be really 
> nice to have a limit control...

v2.6 doesnt have such feature either. 

Shouldnt be too hard to add hooks at page_cache_alloc()/page_cache_alloc_cold()  
level for dropping clean unmapped pages off the tail of the LRU once a given
limit is reached. Andrew ?
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