Messages in this thread | | | Date | Wed, 25 Feb 2009 13:33:07 -0500 (EST) | From | Christoph Lameter <> | Subject | Re: [PATCH 20/20] Get rid of the concept of hot/cold page freeing |
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On Wed, 25 Feb 2009, Mel Gorman wrote:
> It'd impact it for sure. Due to the non-temporal stores, I'm surprised > there is any measurable impact from the patch. This has likely been the > case since commit 0812a579c92fefa57506821fa08e90f47cb6dbdd. My reading of > this (someone correct/enlighten) is that even if the data was cache hot, > it is pushed out as a result of the non-temporal access.
A nontemporal store simply does not set the used flag for the cacheline. So the cpu cache LRU will evict the cacheline sooner. Thats at least how it works on I64.
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