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Diffstat (limited to 'Documentation/fb/deferred_io.txt')
| -rw-r--r-- | Documentation/fb/deferred_io.txt | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/fb/deferred_io.txt b/Documentation/fb/deferred_io.txt index 73cf9fb7cf60..63883a892120 100644 --- a/Documentation/fb/deferred_io.txt +++ b/Documentation/fb/deferred_io.txt | |||
| @@ -3,7 +3,7 @@ Deferred IO | |||
| 3 | 3 | ||
| 4 | Deferred IO is a way to delay and repurpose IO. It uses host memory as a | 4 | Deferred IO is a way to delay and repurpose IO. It uses host memory as a |
| 5 | buffer and the MMU pagefault as a pretrigger for when to perform the device | 5 | buffer and the MMU pagefault as a pretrigger for when to perform the device |
| 6 | IO. The following example may be a useful explaination of how one such setup | 6 | IO. The following example may be a useful explanation of how one such setup |
| 7 | works: | 7 | works: |
| 8 | 8 | ||
| 9 | - userspace app like Xfbdev mmaps framebuffer | 9 | - userspace app like Xfbdev mmaps framebuffer |
| @@ -28,7 +28,7 @@ a relatively more expensive operation. | |||
| 28 | 28 | ||
| 29 | For some types of nonvolatile high latency displays, the desired image is | 29 | For some types of nonvolatile high latency displays, the desired image is |
| 30 | the final image rather than the intermediate stages which is why it's okay | 30 | the final image rather than the intermediate stages which is why it's okay |
| 31 | to not update for each write that is occuring. | 31 | to not update for each write that is occurring. |
| 32 | 32 | ||
| 33 | It may be the case that this is useful in other scenarios as well. Paul Mundt | 33 | It may be the case that this is useful in other scenarios as well. Paul Mundt |
| 34 | has mentioned a case where it is beneficial to use the page count to decide | 34 | has mentioned a case where it is beneficial to use the page count to decide |