On 10/16/2017 02:03 PM, Laura Abbott wrote: > On 10/16/2017 01:32 PM, Mike Kravetz wrote: >> On 10/16/2017 11:07 AM, Michal Hocko wrote: >>> On Mon 16-10-17 10:43:38, Mike Kravetz wrote: >>>> Just to be clear, the posix standard talks about a typed memory object. >>>> The suggested implementation has one create a connection to the memory >>>> object to receive a fd, then use mmap as usual to get a mapping backed >>>> by contiguous pages/memory. Of course, this type of implementation is >>>> not a requirement. >>> >>> I am not sure that POSIC standard for typed memory is easily >>> implementable in Linux. Does any OS actually implement this API? >> >> A quick search only reveals Blackberry QNX and PlayBook OS. >> >> Also somewhat related. In a earlier thread someone pointed out this >> out of tree module used for contiguous allocations in SOC (and other?) >> environments. It even has the option of making use of CMA. >> http://processors.wiki.ti.com/index.php/CMEM_Overview >> > > If we're at the point where we're discussing CMEM, I'd like to > point out that ion (drivers/staging/android/ion) already provides an > ioctl interface to allocate CMA and other types of memory. It's > mostly used for Android as the name implies. I don't pretend the > interface is perfect but it could be useful as a discussion point > for allocation interfaces. Thanks Laura, I was just pointing out other use cases where people thought contiguous allocations were useful. And, it was useful enough that someone actually wrote code to make it happen. -- Mike Kravetz -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
