On 04/19/2012 02:20 PM, Theodore Ts'o wrote:
As I had brought up during one of the lightning talks at the Linux Storage and Filesystem workshop, I am interested in introducing two new open flags, O_HOT and O_COLD. These flags are passed down to the individual file system's inode operations' create function, and the file system can use these flags as a hint regarding whether the file is likely to be accessed frequently or not. In the future I plan to do further work on how ext4 would use these flags, but I want to first get the ability to pass these flags plumbed into the VFS layer and the code points for O_HOT and O_COLD reserved.
Consider this: Is this a testable feature? You're proposing a hint, of course, so it could just have no effect. But let's just assume for the sake of discussion that it has been implemented. How will I (filesystem implementer) know whether I have implemented it correctly? How can the user verify that the use of these flags is producing the expected result? -Alex -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
