Direct map memory extension for storage class memory
An embodiment of an electronic apparatus may include one or more substrates, and logic coupled to the one or more substrates, the logic to receive a first request to allocate a direct swap file associated with an application stored in a system memory on a persistent storage media, and map a linear and continuous space of the persistent storage media to the direct swap file associated with the application in response to the first request. Other embodiments are disclosed and claimed.
1. An electronic apparatus, comprising:
one or more substrates; and
logic coupled to the one or more substrates, the logic to:
receive a first request to allocate a direct swap file associated with an application stored in a system memory on a persistent storage media, and
map a linear and continuous space of the persistent storage media to the direct swap file associated with the application in response to the first request.
2. The apparatus of claim 1 , wherein the logic is further to:
receive a second request to swap data from the persistent storage media to the system memory; and
directly determine a location of the data in the direct swap file in response to the second request.
3. The apparatus of claim 2 , wherein the logic is further to:
calculate the location of the data in the direct swap file directly from a page number of the data indicated in the second request.
4. The apparatus of claim 2 , wherein the logic is further to:
calculate the location of the data in the direct swap file directly from a location offset of the data indicated in the second request and a pre-determined page size.
5. The apparatus of claim 1 , wherein the direct swap file corresponds to a direct swap virtual file, and wherein the logic is further to:
create a logical device partition with linear and continuous logical addresses on the persistent storage media; and
map the logical device partition to the direct swap virtual file such that an offset of memory pages for the application in the system memory corresponds to a same offset of memory pages for the direct swap virtual file in the logical device partition.
6. The apparatus of claim 5 , wherein the logic is further to:
receive a third request to handle a page fault request for the application which indicates a page number; and
read a page from the direct swap virtual file at an address which corresponds to the page number indicated in the third request in response to the third request.
7. The apparatus of claim 1 , wherein the persistent storage media comprises storage class memory.
8. An electronic system, comprising:
a processor;
a system memory communicatively coupled to the processor to store an application for execution by the processor;
persistent storage media communicatively coupled to the processor; and
logic communicatively coupled to the processor, the system memory, and the persistent storage media, the logic to:
receive a first request to allocate a direct swap file associated with the application on the persistent storage media, and
map a linear and continuous space of the persistent storage media to the direct swap file associated with the application in response to the first request.
9. The system of claim 8 , wherein the logic is further to:
receive a second request to swap data from the persistent storage media to the system memory; and
directly determine a location of the data in the direct swap file in response to the second request.
10. The system of claim 9 , wherein the logic is further to:
calculate the location of the data in the direct swap file directly from a page number of the data indicated in the second request.
11. The system of claim 9 , wherein the logic is further to:
calculate the location of the data in the direct swap file directly from a location offset of the data indicated in the second request and a pre-determined page size.
12. The system of claim 8 , wherein the direct swap file corresponds to a direct swap virtual file, and wherein the logic is further to:
create a logical device partition with linear and continuous logical addresses on the persistent storage media; and
map the logical device partition to the direct swap virtual file such that an offset of memory pages for the application in the system memory corresponds to a same offset of memory pages for the direct swap virtual file in the logical device partition.
13. The system of claim 12 , wherein the logic is further to:
receive a third request to handle a page fault request for the application which indicates a page number; and
read a page from the direct swap virtual file at an address which corresponds to the page number indicated in the third request in response to the third request.
14. The system of claim 8 , wherein the persistent storage media comprises storage class memory.
15. A method of managing memory, comprising:
receiving a first request to allocate a direct swap file associated with an application stored in a system memory on a persistent storage media, and
mapping a linear and continuous space of the persistent storage media to the direct swap file associated with the application in response to the first request.
16. The method of claim 15 , further comprising:
receiving a second request to swap data from the persistent storage media to the system memory; and
directly determining a location of the data in the direct swap file in response to the second request.
17. The method of claim 16 , further comprising:
calculating the location of the data in the direct swap file directly from a page number of the data indicated in the second request.
18. The method of claim 16 , further comprising:
calculating the location of the data in the direct swap file directly from a location offset of the data indicated in the second request and a pre-determined page size.
19. The method of claim 15 , wherein the direct swap file corresponds to a direct swap virtual file, the method further comprising:
creating a logical device partition with linear and continuous logical addresses on the persistent storage media; and
mapping the logical device partition to the direct swap virtual file such that an offset of memory pages for the application in the system memory corresponds to a same offset of memory pages for the direct swap virtual file in the logical device partition.
20. The method of claim 19 , further comprising:
receiving a third request to handle a page fault request for the application which indicates a page number; and
reading a page from the direct swap virtual file at an address which corresponds to the page number indicated in the third request in response to the third request.