Re: [PATCH 02/12] mm: supporting variables and functions for balanced zone aging

[Andrea Arcangeli]

On Fri, Dec 02, 2005 at 10:04:07AM +0800, Wu Fengguang wrote:
> btw, maybe it's time to lower the low_mem_reserve.
> There should be no need to keep ~50M free memory with the balancing patch.

low_mem_reserve is indipendent from shrink_cache, because shrink_cache can't
free unfreeable pinned memory.

If you want to remove low_mem_reserve you'd better start by adding
migration of memory across the zones with pte updates etc... That would
at least mitigate the effect of anonymous memory w/o swap. But
low_mem_reserve is still needed for all other kind of allocations like
kmalloc or pci_alloc_consistent (i.e. not relocatable) etc...
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