Re: [PATCH, RFC 0/3] Introduce new O_HOT and O_COLD flags

[Jeff Garzik <jeff@xxxxxxxxxx>]

On 04/20/2012 07:01 AM, James Bottomley wrote:
> The concern I have is that the notion of hot and cold files *isn't*
> propagated to the page cache, it's just shared between the fs and the
> disk.

Bingo -- full-file hint is too coarse-grained for some workloads.  Page 
granularity would propagate to the VM as well as block layer, and give 
the required flexibility to all workloads.  As well as covering the 
full-file case.

	Jeff


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