On Tue, 14 Feb 2012 14:00:47 -0600 (CST)
Christoph Lameter [off-list ref] wrote:

On Tue, 14 Feb 2012, Mel Gorman wrote:

quoted

Thanks Stuart. Rik, Andrew, should the following be improved in some
way? I did not come to any decent conclusion on what to do with pages in
the inactive list with buffer_head as we are already stripping them when
the pages reach the end of the LRU.

We have made the statement in the past that configurations > 8GB on 32
bit should not be considered stable or supported? The fact is the more
memory you add on 32 bit the less low mem memory is available and the more
likely that an OOM will occur for any number of reasons.

I have memories of 16G being usable in earlier kernels.

Also, if an 8G machine works OK at present, it's only by luck. 
sizeof(buffer_head) is around 100, so it takes 1.6GB of buffer_heads to
support 8G of 512-byte blocksize pagecache.

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