diff options
Diffstat (limited to 'Documentation/block/biodoc.txt')
| -rw-r--r-- | Documentation/block/biodoc.txt | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt index 303c57a7fad9..8e63831971d5 100644 --- a/Documentation/block/biodoc.txt +++ b/Documentation/block/biodoc.txt | |||
| @@ -263,14 +263,8 @@ A flag in the bio structure, BIO_BARRIER is used to identify a barrier i/o. | |||
| 263 | The generic i/o scheduler would make sure that it places the barrier request and | 263 | The generic i/o scheduler would make sure that it places the barrier request and |
| 264 | all other requests coming after it after all the previous requests in the | 264 | all other requests coming after it after all the previous requests in the |
| 265 | queue. Barriers may be implemented in different ways depending on the | 265 | queue. Barriers may be implemented in different ways depending on the |
| 266 | driver. A SCSI driver for example could make use of ordered tags to | 266 | driver. For more details regarding I/O barriers, please read barrier.txt |
| 267 | preserve the necessary ordering with a lower impact on throughput. For IDE | 267 | in this directory. |
| 268 | this might be two sync cache flush: a pre and post flush when encountering | ||
| 269 | a barrier write. | ||
| 270 | |||
| 271 | There is a provision for queues to indicate what kind of barriers they | ||
| 272 | can provide. This is as of yet unmerged, details will be added here once it | ||
| 273 | is in the kernel. | ||
| 274 | 268 | ||
| 275 | 1.2.2 Request Priority/Latency | 269 | 1.2.2 Request Priority/Latency |
| 276 | 270 | ||