On Thu, Nov 22, 2018 at 06:59:21PM +0530, Anshuman Khandual wrote: > > > On 11/20/2018 04:36 AM, Keith Busch wrote: > > On Mon, Nov 19, 2018 at 09:44:00AM +0530, Anshuman Khandual wrote: > >> On 11/15/2018 04:19 AM, Keith Busch wrote: > >>> System memory may have side caches to help improve access speed. While > >>> the system provided cache is transparent to the software accessing > >>> these memory ranges, applications can optimize their own access based > >>> on cache attributes. > >> > >> Cache is not a separate memory attribute. It impacts how the real attributes > >> like bandwidth, latency e.g which are already captured in the previous patch. > >> What is the purpose of adding this as a separate attribute ? Can you explain > >> how this is going to help the user space apart from the hints it has already > >> received with bandwidth, latency etc properties. > > > > I am not sure I understand the question here. Access bandwidth and latency > > are entirely attributes different than what this patch provides. If the > > system side-caches memory, the associativity, line size, and total size > > can optionally be used by software to improve performance. > > Okay but then does this belong to this series which about memory attributes ? This patch series is about exporting memory attributes, and this system memory caching is one such attribute, so yes, I think it belongs.
